General Practice 2022

5 reasons for false negative pregnancy test

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5 reasons for false negative pregnancy test
5 reasons for false negative pregnancy test

The result of the pharmacy pregnancy test is usually quite reliable, as long as it is done according to the package instructions and at the correct time, that is, from the 1st day of the missed period. However, to confirm the result, it is best to always repeat the test 2 to 4 days after the first result.

Although the tests are quite reliable, there are often still unexplained changes in the woman's menstrual cycle, which can cause several doubts, especially when the pregnancy test is negative, but menstruation continues without appearing.

So, we have put together some causes that can lead to a false negative, which happens when the woman is actually pregnant, but the test is negative.It is important to remember that the best way to confirm the suspicion of pregnancy is to go to the gynecologist to have a blood test and measure the levels of the hormone bHCG. Learn more about this test and how it's done.

1. The test was done too early

This is the main reason for a false negative and it happens when a woman suspects she is pregnant and, therefore, feels some symptoms that she believes are the first signs of pregnancy, such as breast pain, feeling the need to take the test as soon as possible.

However, the best way to guarantee the result is to wait for the delay of menstruation, and even take the test a few days after this delay, so that the body has time to produce the bHCG hormone in sufficient quantity to be eliminated in the urine and detected by the pharmacy test. Understand better how the pharmacy pregnancy test works.

2. A woman's cycle is irregular

When a woman's menstrual cycle is irregular, there is also a high chance that the pregnancy test will be negative. This is because the test was probably done before the period was late and the woman is just having a period later than normal.

Thus, the best way to ensure that the result is true, in the case of a woman with an irregular cycle, is to take the test only 2, or more, after sexual intercourse. See how the irregular cycle works.

3. It's an ectopic pregnancy

Ectopic pregnancy is a relatively rare situation in which the egg, after being fertilized, implants in a location other than the uterus, usually in the fallopian tubes. In these cases, the body takes longer to produce the hormone bHCG and, therefore, the result can be negative even if fertilization has occurred.

This type of pregnancy is a medical emergency that must be terminated as soon as possible, as it can cause serious damage to the woman's reproductive system.Some signs that may indicate a possible ectopic pregnancy include severe stomach pain, nausea, vaginal bleeding, or a feeling of heaviness near the vagina. If the woman presents these signs, she should go quickly to the hospital to confirm the diagnosis and start the termination of the pregnancy. Here's how to identify a possible ectopic pregnancy.

4. The woman is breastfeeding

When a woman is breastfeeding, her body slowly regulates itself over time, especially in the production of hormones. Thus, it is possible for a woman to have a very irregular cycle initially, even if she had always had a regular cycle before.

For this reason, some women may think they are pregnant when their period is late. Thus, it is possible that the pregnancy test is negative, because the period is just late. Understand if it is possible to get pregnant while breastfeeding.

5. The pregnancy test is out of date

Although this is a rarer cause, it is possible that the pregnancy test was sold out of date. When this happens, the reagent used to identify the presence of the bHCG hormone may be malfunctioning, giving a false negative result.

Therefore, it is very important to check the expiration date on the test package before use. In addition, some tests may have been stored poorly and, even if they are within the deadline, they may malfunction. For these reasons, whenever there is a suspicion that the test is not giving a correct result, you should buy another one at the pharmacy and repeat the test.

What can cause missed period

When the test was done correctly, at the right time and the test has even been repeated, but the result is still negative and menstruation continues without appearing, it is likely that, in fact, you are not pregnant. This is because there are many other factors that can cause a missed period other than pregnancy.

Some causes include:

  • Excessive stress and anxiety;
  • Practice intense physical exercise for a long time;
  • Thyroid problems;
  • Very restrictive diets.

So, if menstruation is late and there is no positive pregnancy test, it is best to consult the gynecologist to identify if there is any other cause that could be causing this delay, initiating the appropriate treatment.

Check out the top 12 causes of late period and what to do.

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