Pregnancy test sensitivity - waiting for a miracle
Pregnancy test is the most popular way to determine the fact of fertilization. But how do tests work and how do they differ from each other? Read below!
How does the test work?
The essence of the action of express pregnancy tests is to determine the level of hCG, a hormone present in a small amount in the body of every woman.
Normally, the concentration of hCG, or as it is also called - " pregnancy hormone and ”is no more than 5 Mme/ml. However, immediately after fertilization, this figure grows rapidly, almost doubling every 2 days.
The range of devices for determining pregnancy allows you to choose from the simplest and cheapest to the most expensive ultra-modern device. But the decisive factor in their choice is sensitivity.
Modern tests can determine hCG in the range of 10-25 Mme/ml. The lower this figure, the higher the sensitivity of the test, and the earlier it can be used.
For example, a pregnancy test with a sensitivity of 10 Mme/ml guarantees the result already 7-10 days from the moment of conception, and use it you can, without waiting for the expected day of the beginning of menstruation. While a pregnancy test with a sensitivity of 25 or 20 can be performed no earlier than 11-14 days, and only if your period is 1-2 days late.
How choose a pregnancy test?
The high sensitivity of the tests is their main difference, which determines the price of the test. The variety of pregnancy testing products is impressive. They differ among themselves not only in price, but also in the way in which you can get an answer to an exciting question about the onset of pregnancy.
In addition to good old paper test strips, tablet, electronic and inkjet strips began to appear on the shelves of pharmacies. tests. The question arises: what to choose?
Test strips (or strip tests) are the first generation of tests. Due to their low price and ease of use, they are very popular among women.
In order to carry out the test, it is necessary to immerse a strip soaked in a special reagent in a container with morning urine. After 2-3 minutes in a specialIn the other window, the result will appear: one strip - no pregnancy, two strips - you are pregnant.
Cons of using test strips:
- the sensitivity of the test strips is usually 20-25 Mme/ml, so they are not suitable for early diagnosis;
- the inconvenience of using test strips is that urine must be in the morning, since the level HCG is the highest;
- if you keep the strip in urine insufficiently or, conversely, too long, the result may be incorrect.
Tablet (cassette ) tests
These tests are improved test strips. They look like plastic cassettes with two windows on the front side. Unlike test strips, tablet tests do not need to be dipped in urine - just drop a little liquid into one of the windows with a special pipette (included in the kit). After a few minutes, the result appears in another (control) window.
The sensitivity of the pregnancy tests is the same as that of the test strips. By and large, they differ from their predecessors only in design and a fairly high price. This is ideal for women who already know about their " interesting situation ", but want to save the result as a souvenir so that they can proudly show it to family and friends.< h3 id = "header-5"> Inkjet tests
Inkjet tests are some of the most modern and expensive. They differ from the previous versions in high sensitivity and ease of use. All you need is to place the receiving end of the device under the stream of urine, and in a minute the result will be ready. The undoubted advantage of this method is that diagnostics can be performed not only in the morning, but throughout the day and even at night.
This is the latest generation of devices for determining pregnancy. Their main advantage is their high sensitivity, which allows early diagnosis.
The device is a plastic tablet with a control window in the middle, in which, instead of the usual stripes, the inscription " pregnant "if the woman is pregnant, or" not pregnant "if there is no pregnancy. The accuracy of such a device is very high, as well as the price. Therefore, not many women can afford this " luxury ".
How accurate are rapid pregnancy tests?
This question worries the vast majority of women trying to independently determine pregnancy. Of course, only a blood test can give an accurate result. This is due to the fact that the concentration of hCG in the blood is much higher than in urine.
However, if used correctly, the accuracy of rapid tests is also quite high - about 97%. Although in some cases they may showfalse positive or false negative result.
For example, results will be invalid if:
A false positive result may be in the presence of tumor diseases, dysfunctional diseases of the ovaries and taking certain hormonal drugs.
In any case, the first what you must do is see a gynecologist. First, only a specialist can fully confirm or refute your guesses. And secondly, the earlier you get tested, the better. After all, early pregnancy diagnosis is a guarantee of your health and the health of your baby!