Almost every woman at least once, but used a pregnancy test. And it does not matter whether she is waiting for the second strip with impatience, or is awaiting the result in horror. In both of these cases, a woman is very worried about one question: how to choose the right test and whether she can show the truthful result.
What is the principle of pregnancy tests
Pregnancy tests, which are produced by pharmacological companies today, are based on the determination of the presence of human chorionic gonadotropin in the body, which is in the urine. The term is abbreviated as HCG or HCG. If there is a qualitative response, then it can determine the presence or absence of pregnancy.
Chorionic gonadotropin is a hormone that only pregnant women have. It is released in large doses immediately after the embryo attaches to the wall of the uterus, which makes it possible to diagnose conception in the first days. HCG is excreted from the body with the help of urine, which makes it possible to conduct a study of pregnancy in this way.
Most expensive quality tests have high sensitivity. This allows you to diagnose pregnancy even before the delay. But in no way can one diagnose conception immediately on the second day after sexual intercourse.
This is because the embryo does not attach to the wall of the uterus immediately. For this process you need from 6 to 10 days. Only after this will start the production of hCG, which will determine the pregnancy.
Thus, with the help of modern highly sensitive tests, it is possible to determine pregnancy even before its first signs begin to appear.
What pregnancy test will show the most accurate results
The most correct way to diagnose pregnancy will be visiting female consultations. But if there is no such desire or opportunity, then it is possible to carry out the procedure at home with the help of a pregnancy test. But not all tests can show one hundred percent result. So which one should you use?
There are several types of tests:
- jet;
- electronic;
- tablet
Choosing a test, you need to pay attention to such factors:
- The packaging should indicate the degree of sensitivity. The lower the number written there, the more sensitive the test. As a result, the woman will be able to determine the pregnancy at an earlier stage;
- If the marking number on the packaging of the drug will indicate 10 mMe / ml, then such a test can be applied even after a week after intercourse, if the marking shows 20 mMe / ml, then it can be used only after a delay;
- The most inexpensive and most popular type of test is a strip strip. It is inexpensive and has an average sensitivity;
- Tablet tests have the same sensitivity as a strip strip, but it is a bit more expensive. Its advantage is ease of use;
- The most sensitive of all the jet test. In its composition there are elements that quickly detect the pregnancy hormone, connect with it and make it visible. If on such a test two lines are clearly visible, then, most likely, the woman is pregnant;
- Electronic tests act the same as others. But due to the fact that technological equipment is used, they are more expensive. They can be used only once.
It is also important to pay attention to the shelf life of the test. It should expire no earlier than one month after purchase.
When does the pregnancy test show the most accurate results?
Not all women know when a pregnancy test will show an accurate result. To do this, you need to know the principle of its action, namely the time of appearance of the hormone HCG in the right quantity (from 7 days after conception).
If you believe medical professionals, then determine the conception is only on the third day of delay. In such cases, it will be as faithful as possible.
If you don’t have the patience to wait so long, you can use a modern inkjet test. Today they can give the most accurate results in early pregnancy.
It is best to do a pregnancy test in the early morning. At this time, the concentration of the hormone HCG is highest. The test can show three results:
- positive;
- negative;
- weakly positive.
If a weakly positive result is shown, then the test should be repeated after three days.
It is important to remember that the test can show only the presence of pregnancy, and not the place in which it is located. If the test shows pregnancy, and there is no fetus in the uterus, it is necessary to consult a gynecologist. Only he will be able to diagnose an ectopic pregnancy.
If such a process has been identified in a timely manner, then complications such as uterine bleeding can be avoided. Thus, it will be possible to have surgery in time and preserve the fallopian tube.
Causes of false results
No matter how carefully all instructions are carried out when using the test, it can always show an incorrect result. Moreover, the result can be both false positive and false negative.
False positive result may be for such reasons:
- poor substandard test;
- analyzes were made incorrectly or read incorrectly;
- if at the same time drugs of hCG were taken;
- the body still has hCG levels after a recent abortion;
- blistering or chorionepithelioma;
- there are threats that the pregnancy will be terminated;
- pregnancy is frozen in nature;
- ectopic pregnancy;
- urine for the test was very diluted (after taking diuretics).
False-negative results appear for the following reasons:
- low quality dough;
- low quality of the analysis, its incorrect reading;
- the portion of urine was taken not in the morning, but in the afternoon;
- pregnancy lasts less than 14 days (if there was an irregular menstrual cycle).
It can be noted that false positive results are much more common than false negative ones. If the pregnancy proceeds normally, then the test, in most cases, will show it.
If there is no experience in carrying out such a procedure, then you can watch a training video about it.
Additional rules for effective use of the test
In order for the test to pass correctly, and the result was as accurate as possible, one must take into account the peculiarity of each female body. If, however, to violate the instructions, the possibility of obtaining a false result is increased several times.
In the early stages of pregnancy, it is important to conduct the test in the morning. But if there is already a long delay, then it can be done in the evening. In such cases, this factor does not matter much.
It is very important to observe sterility in working with the drug. No third-party objects or substances should fall into the liquid used for the procedure. To do this, wash your hands and wipe them dry. You also need to sterilize and dry the vessel for the liquid. This will help secure oneself from the intervention of third-party factors.
The test strip in the urine should be immersed only to a certain level. He painted on canvas. On the side where the level is indicated and the substance that detects pregnancy.
In the next video - additional information about pregnancy tests.
