Just a few days de delay, I'm sure you have the famous question: Will i be pregnant. The first way we turn to in these situations is to a home pregnancy test (predictor), but there are many questions about these tests. In this article, we are going to solve all of them and expand your knowledge on the subject.
What is a pregnancy test?
El pregnancy test It is a tool designed to detect the presence of the hormone hCG (human chorionic gonadotropin) in the woman's urine or blood. This hormone, also known as «the pregnancy hormone», begins to be produced shortly after the implantation of the fertilized egg in the uterine wall. hCG levels increase exponentially during the first weeks of pregnancy, reaching their peak in the week 8 to 11, then stabilized and decreased.
The test works thanks to specific antibodies present in the test strip, designed to detect hCG. If this hormone is present in the sample, the test will react by showing a line, cross or a digital result (like "Pregnant" o «Not pregnant»).
When should I take the pregnancy test?
The right time to have a pregnancy test is key to obtaining reliable results. It is advisable to do so 14 days after missed period, since by then hCG levels are usually high enough to be detected.
If you decide to do it before, it is best to use the first morning urine, as it is more concentrated and contains higher levels of hCG. However, some high-sensitivity tests can detect pregnancy up to 5 days before from the first day of delay, although with less precision.
How to use a pregnancy test correctly?
Using a pregnancy test is a simple procedure, but it is important to follow the manufacturer's instructions. Here are some tips followed general:
- Read the instructions: Each brand may vary slightly in steps to follow, waiting times and application methods.
- Urine collection: Depending on the type of test, you will need to urinate directly onto the test strip or collect the sample in a sterile container.
- Wait: Place the test on a flat surface and wait the indicated time (usually between 3 to 10 minutes).
- Interpret the results: Check the result according to the instructions on the package. Remember that you should not interpret the test after the maximum recommended time, as it may give erroneous results.
Could you give me a false positive?
Un false positive It is rare, but not impossible. It can occur under certain circumstances, such as:
- The test is defective or expired.
- You have used fertility drugs containing hCG.
- You recently suffered a miscarriage or childbirth.
- Presence of certain diseases such as tumors that produce hCG.
- You performed the test incorrectly or misinterpreted the result.
If you get a positive result, even if you have doubts, it is ideal to confirm the diagnosis with a blood test or a visit to the gynecologist.
What happens with false negatives?
Un false negative This may be more common than a false positive and usually occurs when the test does not detect sufficient levels of hCG. The main causes include:
- Performing the test too soon.
- Very diluted urine due to high fluid intake.
- Improper use of the test.
- Expired or low sensitivity test.
If you get a negative result and still suspect pregnancy, it is advisable to repeat the test a few days later, preferably with the first urine of the morning.
Is blood testing more reliable?
El blood test It is considered the most accurate method for confirming a pregnancy. There are two types of analysis:
- Qualitative: Indicates whether or not hCG is present.
- Quantitative: It measures the exact amount of hCG in the blood, which allows determining the stage of pregnancy.
While urine tests detect hCG only at a minimal level (usually 20-25 mIU/ml), blood tests can identify much lower amounts, ensuring earlier detection.
What types of pregnancy tests are there?
There are different types of pregnancy tests, each with its advantages:
- Analog tests: Those that show the results using lines or symbols on the test strip.
- Digital tests: They show the result in text format ("Pregnant" o «Not pregnant») and, in some cases, indicate the estimated gestation period.
- Ultrasensitive tests: They detect very low levels of hCG, allowing results to be obtained even before the menstrual delay.
What can alter the results of a pregnancy test?
Some factors may influence the reliability of the test. These include:
- Drugs containing hCG, such as those used in fertility treatments.
- Urine contaminated with blood or other chemicals.
- Use of non-sterile containers to collect the sample.
- Diseases such as lupus or certain types of cancer that affect hormone levels.
To minimize errors, always follow the manufacturer's instructions and use tests from trusted brands.
Additional FAQs
We will answer other relevant questions you may have:
- Can I get tested after unprotected sex? No, you will need to wait at least a week for the fertilized egg to implant and begin producing hCG.
- Is it possible to detect pregnancy with an ovulation test? Although these tests detect LH, which may be elevated during pregnancy, they are neither specific nor reliable for this purpose.
- What should I do if my test is positive or negative? If the test is positive, go to the doctor to confirm the pregnancy. If the test is negative and the delay persists, repeat the test or consult a specialist.
Knowing all these details about the correct use of pregnancy tests, their types and possible results will help you make informed decisions. If you think you may be pregnant, the first step is to take a test and, if you have any doubts, go to the doctor. Accurate information is key to facing this stage with peace of mind and security.