Pregnancy Test (blood, pharmacy): how to do, price, results

Sometimes desired, sometimes by surprise, pregnancy is always a radical change in the routine of the woman. Some have early onset symptoms, which may be milder – like cramps and mild swelling of the abdomen – or more intense – like vomiting and fainting.

The most frequent sign is the delay in menstruation, but there are women with a very irregular cycle that may not notice it or, still, there are those who present other bleeds that are confused with menstruation.

Other signs that may indicate pregnancy are:

  • The presence of pink vaginal discharge, with no odor and more intense than normal;
  • The presence of colic or mild abdominal pain with swelling of the region;
  • Pain or tenderness in the breasts;
  • Change in the constitution of the skin (more oily or drier);
  • Tiredness or fatigue ;
  • Nausea and nausea;
  • Sleep disorders;
  • Sensitivity to odors, mainly food;
  • Humor variation.

But since there are broad symptoms that will not necessarily occur, their presence (or absence) is not able to determine pregnancy.

A few years ago, confirming whether these symptoms were caused by a developing baby was much more complicated. The cost, the time of the result and the necessity of a medical request made difficult the feminine accessibility to the examination.

Women now have cheaper, easy-to-find options, with fairly quick results and the ability to detect pregnancy in the first few weeks or days.

What is pregnancy testing?

Pregnancy testing is a procedure to check the dosage of the hormone beta hCG (called the pregnancy hormone) and check or rule out pregnancy.

The hormone is produced by the fetus and passes into the circulation of the mother. As blood is filtered through the kidneys, a part of that hormone is retained by the organ and eliminated by the urine.

Therefore, the tests can draw on both fluids – blood or urine – to detect pregnancy, and there are clinical exams and pharmacy tests for this.

Blood tests, performed in laboratories, tend to have greater sensitivity, detecting pregnancy more precisely. But pharmacy tests are generally able to deliver accurate results, as well as to be a practical, inexpensive resource that can be done at home through a small urine sample.

Both show fast results, but the pharmacy test can give the opinion in a few minutes, while the blood test can take about 24 hours, depending on the laboratory.

Manufacturers indicate that urine tests have high efficiency in detecting the hCG hormone from the first day of menstrual delay and especially after the third week of gestation. However, it is always important to confirm the result through the laboratory examination.

Read more about:

How does fertilization happen?

When the sperm reaches the uterus, the search is through the fertilization of the ovum, through the penetration of the outer membrane. When one of them can rupture the ocular membrane, fertilization is performed.

It takes about 20 hours after the sperm enters the egg to form the zygote, which is when the egg and sperm nuclei (which carry the DNA of the mother and father, respectively) merge.

Then occurs the first of several cell divisions. However, this process still happens in the tube and, to effect pregnancy, the zygote must reach the uterus and attach itself to the wall of the organ.

On average, it takes 7 days for this implantation in the uterine cavity, called nidation, which also involves small bleeding (often mistaken for menstruation leakage).

What is human chorionic gonadotrophin (hCG)?

It is only when the entire implantation process in the uterus occurs that the embryo begins to secrete human chorionic gonadotrophin or Beta hCG.

But with rare exceptions, hCG may be elevated due to the presence of gestational trophoblastic disease and some types of cancer, such as in the ovaries or testes – that is, men may also have hormone altered.

The release of hCG occurs approximately 10 to 12 days after fertilization by placental trophoblast cells. The hormonal action stabilizes the progesterone and estrogen (female hormones), interrupting the menstruation so that the pregnancy can be maintained.

It is the only hormone exclusive to the gestational period, so its detection is sufficient to determine pregnancy.

HCG plays a key role in embryo implantation and maintenance of gestation and signals the body to inhibit the next ovulation and maintain adequate progesterone and estrogen production, thus preventing abortion.

With the presence of progesterone, the blood vessels and capillaries (smaller vessels) of the uterus become stronger because of a more fortified coating. Thus, the organ can support the growth of the fetus without risks to the mother or gestation.

Also, hCG is involved in the early symptoms of pregnancy. That is, that first nausea, dizziness, increased sensitivity, and mood swings are the fault of the hormone that increases considerably until the first 10 or 12 weeks.

This time is equivalent to the first trimester of pregnancy, where the symptoms are usually more pronounced.

From that point on, the trend is for the levels to drop gradually by the 20th week and finally to stabilize.

The normal elevation of most pregnant women in the first 3 months is so high that hCG levels double every 2 or 3 days. Most pregnant women show an increase of at least 60% of the value every 2 days.

When pregnancy is suspected, and the tests still show that the hCG is between 0mIU and 25mIU and the menstrual delay persists, the tests should be repeated between the next 3 and 10 days.

For values between 25mIU and 100mIU, it is considered positive or indeterminate and may vary according to the laboratory. If the test is indeterminate, the test should be repeated for at least 3 days.

The hCG in the body: pregnancy symptoms

With high hormone production, some changes begin to occur in the body, but these signs are not mandatory requirements for gestation to develop, as each woman will experience the coming months in a very individual way.

You probably already heard about some mother who had all the signs, desires and nausea from the first few weeks, while another came up to the 5th month with almost no belly and no symptoms.

When they occur, among the most common perceptions are:

Abdominal discomfort

Colic may occur in the early days, accompanied by discomfort and pulls in the uterine region and are often attributed to menstruation.

Changes in breasts

Just like the belly, the breasts will undergo great adaptations in the gestation period. The breasts may become more tender and tender, showing swelling and itching. Also, sometimes it is possible to perceive bluish veins in the region and the darkening of the areolas.

Nausea and vomiting

Nausea and vomiting are one of the first and most recurring signs of pregnancy. The association is so constant that if any woman reports nausea (even after eating a super heavy lunch), someone will certainly ask about pregnancy, whether by joking or not.

There are two hypotheses about this symptom in pregnant women. One is that the fetus, initially, is considered an invader. It occupies an inner space of the woman and feeds on her nutrients as she develops.

In this sense, the body still does not understand exactly the changes that are occurring and, therefore, considers the baby as a threat to the integrity of the woman. Nausea would be a way to counteract and warn the rest of the body that something is wrong.

A second hypothesis is that the mother’s organism mobilizes to protect and strengthen the baby, so nausea would be a protective response, preventing the toxins present in foods from affecting the embryo in this still critical period of development.

Dizziness and dizziness

Pregnancy Test (blood, pharmacy): how to do, price, results

Dizziness is quite common in the first trimester of pregnancy, often associated with low blood pressure. If the region or season is hot, care should be taken to avoid fainting.

Types of Pregnancy Test

There are two methods to confirm pregnancy: the urine test and the blood test. Both can be used, but for effective medical diagnosis, it is the blood test that counts.

That is, when you go to the doctor – even with dozens of tests of pharmacy demonstrating the positive – the Beta hCG blood will be requested.

Although manufacturers and laboratories indicate that the pharmacy test is quite safe, urine hCG levels are lower than those in the blood, so they may not be detected in the initial periods.

Know a little about each method and its effectiveness:

Blood test

Pregnancy Test (blood, pharmacy): how to do, price, results

The examination does not require a fast and can be requested by any medical professional or performed in private, without the request. Generally, the laboratories take less than 24 hours to give the opinion.

There are 2 types of examination: the qualitative and the quantitative. Both will analyze the presence of the hCG hormone in the blood, but they differ in how they present the results.

Qualitative

The qualitative pregnancy test will indicate only “positive” or “negative.” It is done through the hormonal measurement of hCG, but without pointing out the values. Compared to the quantitative test, the result tends to be faster and easier for the woman to read.

Quantitative

For those who are in a hurry in the result, the quantitative examination can be a little more time consuming, taking up to 48 hours depending on the laboratory.

The quantitative test may also be used for purposes other than confirmation of pregnancy, such as follow-up of gestational trophoblastic disease, ectopic pregnancy (out of the womb), germ cell tumors, and abortion.

In pregnant women with higher hCG rates from the start, the values go up more slowly.

The quantitative test can help in indicating the gestation period, but to know more precisely the time of pregnancy, it is important to talk to the doctor. In general, the results of the hCG rate should be combined with ultrasound to determine the time of pregnancy.

Urine test (pharmacy test)

Pharmacy tests can be purchased without the need for a medical request or indication. In general, they cost from R $ 3 and offer reliable results in 99% of cases, according to manufacturers. The test is quite fast, and the result appears in less than 5 minutes.

Each brand may have a different sensitivity, which will appear on the packaging, and it is worth remembering that not always the most expensive is the most accurate or most sensitive.

While some models with high precision can detect levels of 20mIU / mL of hCG in the urine, the less sensitive ones can measure from 50mIU / mL of the hormone.

Even if some manufacturers indicate the ability of the test to identify the pregnancy up to 4 days before the menstrual delay, it is most appropriate that the method is done from the 1st day of the delay because before that the chances of a false negative are greater.

If the test is negative, but menstruation continues late, or there are characteristic symptoms (such as nausea), the woman should repeat the test after at least 3 days.

There are different product presentations – ribbons, pens, digital, and liquid – but all work closely, identifying hCG in a small urine sample. Understand a little more about each type:

Strips

Some tests are done with strips or stems, which can be accompanied by a cup collector of urine or not. The manufacturers of the most popular brands indicate that the product has a precision of up to 99.9% and the result appears between 1 and 3 minutes.

The strip is produced with paper, dye and reagent antibodies, coming in sealed plastic or silica packages.

Pen

The penis pregnancy test is quite similar to the tape test, usually with the changed shape, being wider and more anatomical.

Some models accompany a urine collecting vial, but just like the vial, can be placed directly in the urine jet.

The pen displays the result in the same way as the tapes, with 1 or 2 scratches, indicating negative or positive, consecutively.

Digital

There are digital pregnancy tests that follow the same pattern as the model made with rods or ribbons. The main difference is the digital form of revealing the result, but the reaction is the same, occurring by the detection of hCG.

Through urine, the small meter will indicate whether the liquid has high concentrations of hCG. The major manufacturers indicate that the digital test has accuracy greater than 99%, with the ability to identify gestation up to 4 days before the menstrual delay. Also, the digital version has an easier format to hold.

Some marks offer the quantitative version of the digital test. In this case, if the result is positive, the meter indicates how many weeks the conception occurred (1 to 2 weeks, 2 to 3 weeks or more than 3 weeks).

Manufacturers indicate a precision of up to 92%, in general, of design time measurement.

Liquid

The model is a test tape, but instead of the result appear in 1 or 2 strips, if it gives positive, it will turn blue. In negative cases, the test may turn red or yellow, depending on the model.

Although widely used in other countries, the liquid type is not very well known in Brazil because it is not marketed here.

Home pregnancy tests

Pharmacy testing is also called home testing. Also, you may have heard of home-made alternatives to urine testing, but there is no scientific evidence that they are functional or reliable and may even pose a health risk.

An easy search on the internet and you will find easy methods to detect pregnancy using products like bleach, vinegar or even cola soft drinks. In general, they are tactics that were used before the scientific advances and remained in popular knowledge.

In the case of bleach, when mixed with urine, it can be harmful to breathing, emitting irritating odors.

The ideal is to resort to the pharmacy exam that is fast, safe and efficient in most cases. If the result is positive, it is necessary to make a medical consultation in which the blood test will be requested.

How to take the pregnancy test?

For those who have never taken a pregnancy test, information is always facilitative. Check how it works and how to proceed in each type of exam:

Laboratory examination

The blood test to detect pregnancy follows the traditional collection procedure, in which a sample will be taken from the vein of the arm unless it is not possible or feasible to do the puncture at the site.

You do not need to be fasting to take the qualitative or quantitative exam. In the first case, the reading of the test is simple, presenting results as “positive/reactive” or “negative / non-reactive.”

The quantitative type often needs more care. Some labs may recommend that the patient has not used biotin (vitamin B7) within the past 72 hours, nor have contrast tests been performed in the last 48 hours.

Pharmacy exam

For pharmacy tests, it is indicated to perform them with the first urine of the day. Although according to the manufacturers, can be done with any sample of pee throughout the day, it is in the first sample that the chances of false negative are smaller, because there is no risk of the urine being diluted.

If you have ever done a urine test, know that the recommendation is to scorn the first jet and reap the rest of the pee. Then you can follow the same procedure.

The tests are mostly quite similar in performance, but it is always necessary to carefully read the instruction leaflet that comes with each product. Both the tape test and the digital test can usually be done with the urine collector or by placing the meter directly in the jet.

Before you perform, check out the model you bought can be made both ways.

With collector

In general, to do, follow the following steps:

  1. Open the test (only at the time of use so you do not risk changing);
  2. If the test is accompanied by the collection cup, pee the container and immerse the tip of the indicated urine in the urine, ensuring that all necessary region is immersed in the liquid. If it does not come to the cup, you can buy one separately in pharmacies;
  3. Wait 10 seconds and remove the meter from the collecting cup, letting it rest on a flat surface.

Ideally, pee is used in the test soon after it is done, however some manufacturers indicate that after peeing in the collector, you can use it in up to 2 hours if left at room temperature, or within 4 hours if kept in a refrigerator.

Some tests may have a pink line already in the initial seconds, but this is only an indication that the meter is reacting. You should wait between 1 and 3 minutes for the final result.

Directly in the urine stream

If you prefer to dispense with the collector or do not wish to purchase one separately, you can perform the test as follows:

  1. Open the test (only at the time of use so you do not risk changing);
  2. Identify the detection tip and place it under the urine stream for 5 seconds (or as recommended by the manufacturer);
  3. Rest the meter on a flat surface and wait for 1 to 3 minutes, as instructed.

When to do it?

The pharmacy tests present more reliable results if they are made from the delay of the menstruation, because before that, in the pregnant woman, the indices of hCG are quite low and often undetectable in the examination of urine.

Although some labs point to the effectiveness of the pharmacy procedure even before cycle delays, doctors suggest the best sensitivity of the blood test, especially because there are women who do not have the well-regulated cycle.

In these cases, you can consider the time of your cycle longer. For example, if your menstruation occurs at intervals of 25 to 35 days, consider the delay after the 35th day of last menstruation.

Also, in cases of irregularity, the test can be performed after 20 days of sexual intercourse.

If you are not planning or expecting a pregnancy (and pregnancy tests are already part of your monthly routine), some signs may be indicative for the test:

Irregular cycle

This is usually the first signal perceived by the woman. Those with a regulated cycle more easily notice menstrual absence, but those who do not have such a regulated organism may take longer to notice something different.

In any case, delayed menstruation is always an important signal.

Symptoms and signs of the body

Breast aches, bloating, nausea, cramps, and dizziness are some of the symptoms of pregnancy. If you begin to notice changes in mood, changes in appetite, increased body sensitivity (pain), and emotional instability (irritation, euphoria, anxiety, or any other emotional cues), it is time to take a test.

Contraceptive care

Contraceptive methods, such as condoms and pills, have high but fail-safe protection. Ideally, the pill should always be taken at the same times, and condoms should be used.

Surveys indicate that there are risks of up to 1 woman in 100 who take a daily contraceptive and make strict use of the method (every day, at the same time, with medical follow-up) are at risk of becoming pregnant.

This figure rises to 9 out of every 100 women who use it irregularly (times changed, without medical follow-up or forget to take the medication someday).

Therefore, being alert for signs is always important, but if you are part of the group that does not make rigorous use of the method (or eventually forgot in one day), pregnancy testing can be recommended.

How much does it cost and where to do it?

The blood test can be requested by the doctor and done at any clinic, laboratory or hospital that performs blood collection.

In general, the test needs a referral guide if it is performed by health plans, but if you are to perform the particular examination, it can be requested directly at the collection site. You need to check the availability and policy of the laboratory to perform exams without medical guidance.

On average, the private exam costs from R $ 40.

Urine tests can be found in commercial pharmacies and cost from R $ 3, and can reach R $ 40.

Below you will find a list of some of the most popular pregnancy tests ordered by the average price:

  • Pregnancy Test Check: between $ 2 and $ 4.
  • Pregnancy Test Verifik Strip: between $ 4 and $ 5.
  • Pregnancy Test Check out Pratic: between $ 6 and $ 15.
  • Pregnancy Test Baby Test: between $ 9 and $ 12.
  • Pregnancy Test Grav Test Click: between $ 10 and $ 15.
  • Pregnancy Test Confirm Plus: between $ 14 and $ 22.
  • Clearblue Digital Pregnancy Test: between $ 27 and $ 50.

In the Consultation Remedies, you will find these and other options. In addition to comparing prices, you can find complete information about each test.

How to interpret the results?

 

In general, pregnancy tests are quite easy to interpret, be it pharmacy or blood tests.

Blood test result

Normally employed blood tests can detect hCG levels of at least 5 mIU. There are more sensitive tests, which can detect from 1mUI per mL of blood but are not part of the tests offered by most laboratories.

Qualitative

In qualitative tests, the test will show positive / reactive or negative / non-reactive, and may be accompanied by the following parameters:

  • hCG below 5mIU / mL = negative;
  • hCG between 5mIU / mL and 25mIU / mL: indefinite result (it is recommended to repeat the test after 3 days);
  • hCG above 25mIU / mL: positive result.

Quantitative

In the quantitative tests, the results presented are more specific, indicating the time of gestation.

Below you will find an estimated mean hCG dosage according to the last menstrual period (UPM). That is, to interpret the average ideal value, you need to know when your menstrual period was last lowered:

  • 3 weeks (UPM) : 5 – 50mIU / mL
  • 4 weeks (UPM) : 5 – 426mIU / mL
  • 5 weeks (UPM) : 18 – 7.340mIU / mL
  • 6 weeks (UPM) : 1.080 – 56.500mIU / mL
  • 7-8 weeks (UPM) : 7,650 – 229,000mIU / mL
  • 9-12 weeks (UPM) : 25,700 – 288,000mIU / mL
  • 13-16 weeks (UPM) : 13,300 – 254,000mIU / mL
  • 17-24 weeks (UPM) : 4.060 – 165.400mIU / ml
  • 25-40 weeks (UPM) : 3,640 – 117,000mIU / mL
  • Non-pregnant women : <5.0mIU / mL
  • Women after menopause : 9.5mIU / mL

But, remember, the values are average and do not work as a determining table. This is because hCG levels can start low and take a while to rise, rising rapidly after a few days.

Pharmacy test result

As the idea of the test is to facilitate the achievement of the result, the test is quick and simple to read. Be it the strip or the digital model, always consult the package leaflet, but overall the results are interpreted as follows:

Qualitative

On tape tests, you will see 1 risk for negative or 2 for positive risks, invariably. That is, 2 risks, whether they are parallel or cross “+” invariably indicate pregnancy.

In digital tests, the results may also appear with the risks, the same as the tape, or with the written information “positive/reactive” or “negative / non-reactive.”

Quantitative

The digital tests can be bought in the quantitative version too, which shows the estimated result of the time of gestation.

In general, this type shows the processing and indicates while the reading is being made and the possible results are:

  • Not pregnant ;
  • Pregnant 1-2: conception occurred about 1 or 2 weeks ago;
  • Pregnant 2-3: conception occurred between 2 and 3 weeks;
  • Pregnant 3+: conception occurred more than 3 weeks ago.

Manufacturers point out that the week’s indicator of digital testing has an accuracy of approximately 92% in detecting design time.

What is a false negative?

In general, incorrect results are rare, but false negatives can occur if the test is done early in the gestation period when there is not enough time for hormone production to begin.

Blood tests can detect much lower concentrations of hCG compared to urine tests; that is, they can point the positive result already in the first days. Therefore, for those who want to use the pharmacy method, it is necessary to wait for the first day of menstrual delay, reducing the risks of a false negative.

For medical validation, the blood test is always used. In addition to detecting more accurately, blood hCG is usually identifiable between the 8th and 13th day after conception (which equals about 1 to 6 days before the menstrual delay occurs).

Few causes lead to a false negative blood test. In general, it was performed very early, with no time for hCG rates to rise.

One of the factors that cause this mistake is the irregular menstrual cycle, because the woman thinks that she should be menstruating and takes the exam. But the correct period to lower menstruation has not yet occurred.

In pharmacy tests, the false negative can still occur if the used pee is very diluted, so it is best to take the test with the first urine of the day.

The use of diuretics or promethazine (antihistamine) may have a false negative in the pharmacy test because these substances contribute to the dilution of urine.

Factors such as the use of contraceptives, alcohol, infections, antibiotic use are not able to interfere with the results.

What is the false positive?

Doing the test incorrectly can be the cause of a false positive. For those who are going to do the type of pharmacy, it is always necessary to read the instructions and be attentive and careful to the realization.

The amount of urine, the cleaning, and sterilization of the collection vessel, and the shelf life of the test may interfere with the results.

If the test was performed correctly, with all due care taken, there are still other factors that can determine how many lines will appear on the meter.

Reproductive treatments (to assist in follicle maturation or implantation of the embryo, for example) and the test in recent periods of childbirth or abortion are the most recurrent causes of false positives.

It is because to aid in reproduction, hCG hormone treatments are used and, after delivery, the levels still take a while to lower, as well as in cases of abortion.

In addition, when the egg is fertilized, but there is no condition of it being implanted in the uterus, there may be a hormonal elevation, without actually continuing the pregnancy. It is estimated that up to 15% of fertilizations can not develop and implant in the womb.

Some medicines may cause a false positive in the urine test, including:

  • HCG hormone, used in treatment for reproduction;
  • Tranquilizers such as diazepam and azapirones;
  • Antipsychotics such as chlorpromazine, clozapine, triflupromazine, and thioridazine ;
  • Anticonvulsants and antiepileptics, such as phenobarbital ;
  • Medications for Parkinson’s disease, such as phenylalanine, tyrosine dopamine, bromocriptine and anticholinergics, such as benztropine and scopolamine;
  • Diuretics such as furosemide, spironolactone, thiazides and osmotic diuretics such as mannitol and glucose;
  • Antihistamines, such as Promethazine.

Diseases and changes in the body, such as hepatitis, cysts, tumors in the ovary, bladder infections, and rare diseases, including lupus , disability Iga, hydatidiform mole and some types of melanomas and carcinomas may also be responsible for false positive.

Women at menopause or near the stage may have elevated hCG. It occurs because of hormonal production by the pituitary gland, a cerebral gland. In these cases, the results show results usually slightly above 25mIU.

The history of pregnancy exams

 

Knowing if there is a baby on the way or not is a somewhat relevant information. For this reason, it is not of today that tactics and methods of confirming suspicions are sought.

Since the time of the Egyptians, there are reports of techniques used for the detection of pregnancy, and they have been explored, developed and changed over the years until we reach the current high-precision tests.

It is not only the sensitivity and efficacy of the test that has gotten much better but also the versatility – you can find out if you are pregnant by peeing in the bathroom in your home and knowing the result in less than 5 minutes. But it was not all that simple, and many of the techniques used before were rather bizarre.

In Egypt, to see if a new child would soon come in the family, grains of barley and wheat were placed in cloth sacks, and the woman’s pee mingled. If the grains germinated, the result was positive.

But Egyptian ingenuity was not limited to positive or negative results, as it was believed that he could even know the sex of the child. If it were the grains of barley that germinated, it would be a boy. If it was wheat, girl.

After the discovery of the hCG hormone, scientists and researchers began to adopt animals to take the pregnancy test. Approximately in 1928, the procedure consisted of injecting the woman’s urine into a rat and evaluating the animal.

If the woman were pregnant, the rat would start her estrangement because of the hormonal presence. However, it was only possible to identify the onset of mouse estrus by checking whether the ovaries were enlarged by dissection after 5 days, that is, by killing the animal.

Sometime later, the mice were replaced by rabbits. The test consisted of injecting the woman’s urine into the animal’s ears. The researchers looked at the rabbit, and if there was metabolic change, the result of gestation was positive.

Although it was possible to keep the animals alive, it was necessary to perform surgical interventions, which made the procedure very costly (both in price and time issues). That is the animal needed to be sacrificed after the pregnancy test.

According to information from the University of California, frogs of the genus Xenopus were used as pregnancy tests in hospitals in the 1940s and 1950s because they were very sensitive to hCG. The animals were then used to detect gestation.

The toad test consisted of injecting the pregnant woman with urine into a toad. As the pregnant woman’s pee is rich in hCG, the amphibian would be stimulated to ovulate between 8 and 10 hours. Although not all the animals were sacrificed, the number of deaths was still great.

If we were around 1960, it would be much more complex to detect gestation. In general, the tests were done in the laboratory and were still time consuming and laborious.

The first homemade pregnancy test was made in the late 1960s by Margaret Crane, an American publicist who did not even have a background in chemistry or biology.

Margaret visited the laboratories of Organon Pharmaceuticals, a cosmetic company, to draw sketches for some products. What she did, however, was to revolutionize the way women followed their lives, as she was responsible for reproducing pregnancy tests in a home-like manner.

Until the time, detecting a pregnancy could only be done with the aid of specialized laboratory and chemists.

In 2015, the prototype made by Margaret was auctioned for $ 12,000 (about R $ 45,000 in current currency), purchased by the History of America Museum in Washington.

Common questions

Can I take the pregnancy test before menstruation delays?

It may, but the results run the risk of not being so accurate, especially in the pharmacy exam.

If the method chosen is the one of blood, due to the high sensitivity, it is possible to identify the hCG approximately 6 days before the menstrual delay is perceived.

Some home-testing laboratories indicate that the sensor can pick up even the small hormone concentrations that are expected before the delay in menstruation is noticed. However, most false negatives are due to the very early examination.

Can I take the test if I have had to bleed?

Yes. Remember that not all bleeding is menstruation. It can be caused by the process of nesting (implantation of the egg in the uterus) or by a recent abortion. In all cases, the pregnancy test can be performed without the bleeding altering the result.

Are pharmacy pregnancy tests safe?

Pharmacy testing is a good option to detect pregnancy. Manufacturers are now developing fairly accurate and easy-to-use techniques as long as they are employed at the right time.

Urine hCG concentrations may be slow to rise, so if the test is done too early, the result may not be as accurate.

It is also important to remember that the tests sold in pharmacy are useful so that the woman has a quick and accessible resource to verify the presence of the pregnancy. However, it does not replace the laboratory examination, nor the medical consultation.

Just like any exam, the pregnancy test may suffer interference as well. Even the blood test can accuse a false negative, so medical monitoring is essential.

The second risk is erased; what does it mean?

Regardless of color or appearance, if 2 risks appear on the pharmacy test, the result is positive. Sometimes the low hormone concentration may interfere with the formation of the symbol, but this does not change the pregnancy indicator.

In cases of doubt or insecurity, repeat the test or perform a blood test.

The test was positive, but I’m on my period. Is it a false negative?

There is a very common mistake regarding pregnancy and menstruation since it is not possible for them to occur together. For gestation to develop, there is a hormonal release that inhibits menstrual bleeding.

You may even know women who have had bleeding while pregnant, but the truth is that it is bleeding from a source other than menstrual. Between them:

  • Implantation bleeding (small amount of fluid that occurs when the embryo implants in the endometrium);
  • Bleeding after gynecological exams or sexual intercourse: It is possible that the inner walls of the vagina and cervix are more sensitive and therefore more easily injured;
  • Gynecological infections: herpes, candidiasis, bacterial vaginosis, and chlamydia generally do not trigger bleeding but may leave the wall of the vagina more irritated and sensitive, favoring bruising. Also, bleeding may be a sign of gonorrhea and should be investigated.

Other factors may be more severe, for example, the placenta previa (up to 80% of patients with placenta present bleeding without pain) or placental abruption (bleeding also affects 80% of patients), in which risks to the mother and the baby are larger.

Can a high concentration of beta hCG be a sign of twin pregnancy?

The high dosage of hCG may be an indication that you are pregnant with twins, but only one ultrasound can confirm the result as soon as the amount of hormones varies greatly for each woman.

Generally, the symptoms of early pregnancy are stronger in the mothers of twins due to the high hormonal concentration as soon as it is the hCG that causes the initial symptoms.

However, if the exam is the pharmacy tape, having 2 well-marked lines (well strong and sharp) can not be considered an indication of twin pregnancy.

Which pregnancy test is most accurate?

Although the manufacturers point out that the pharmacy tests are susceptible, with a degree of precision that can reach 99%, the blood test is still more indicated to confirm the gestation.

In brand issues for pharmacy testing, one only needs to be aware of the validity and certification of ANVISA. Not always the most expensive product represents the best quality or the best cost benefit.

How do I know how long I’ve been pregnant?

In a regular cycle of 28 days, ovulation occurs on the 14th day after the onset of menstruation and may occur 3 days before or after that date.

Sperm can survive for up to 72 hours inside a woman’s body. From ovulation, fertilization takes up to 24 hours to occur and, between 5 and 7 days, the egg migrates to the wall of the uterus (which is in the endometrium), configuring the nesting process.

Because it is quite difficult to precisely determine the day fertilization occurred, physicians make the gestational count from the delayed menstrual period. In general, the embryo is about 14 days younger than the day of menstrual delay.

Therefore, women who have a well-regulated cycle can estimate more easily when they started a pregnancy.

If menstruation is extremely dysregulated, one should wait for the ultrasound examination to confirm the weeks of gestation.

Can Ultrasound Detect Pregnancy?

Ultrasound is an imaging test that is usually used to monitor the pregnancy. It is because, for most women, it is only able to indicate the presence of the baby from the 5th or 6th week of gestation.

During this period the doctor can already identify the gestational sac. But it is important to remember that in the 5th week the baby is still an embryo with only about 6mm.

For those who want to know the sex of the baby, it is necessary to wait at least until the 13th week, and it is usually only in the 15th that the doctor can affirm the sex.

So, yes, ultrasound can detect pregnancy, but it’s usually used to accompany it and not to confirm it.


With high sensitivity and a fairly quick result, pregnancy tests can be done at home, with the urine test, or in laboratories, with blood tests.

Although doctors find out the pregnancy before the laboratory test, those sold in pharmacies can confirm or rule out suspicions of pregnancy and offers a low cost of completion.

As soon as there is a suspicion of gestation, the examination must be performed so that the necessary care, in positive results, is initiated.

Tests sold in pharmacies are a fast and pretty safe option, but care must be taken during the procedure, following the procedures indicated by the manufacturer and respecting the correct periods (preferably after the menstrual delay).

For the blood test, the results are reliable, nd the chances of false results are infrequent, except in cases where there is organic dysfunction or use of some drugs. Therefore, it is always necessary to seek expert advice and inform the doctor about treatments and symptoms.

And if the outcome is positive, find the Minute Health Care and Pregnancy Well-Being Tips!