- The study was conducted too early, when the level of hCG in the urine is low;
- the test strip has expired;
- a large amount of liquid, drunk the day before, decreased the concentration of hormones in the urine.
Reasons for false positive results:
- taking hormonal drugs with hCG;
- the presence of a malignant tumor on the internal genitalia;
- less than 3 weeks after a spontaneous or medical abortion.
Principle of the pregnancy test
Any such test will detect it in a woman's urinethe presence of a special hormone, hCG. This is human chorionic gonadotropin, which begins to be produced at the beginning of pregnancy, and its amount gradually increases. After the attachment of the fertilized egg to the wall of the uterine cavity, the level of hCG begins to double every two days and by 12 weeks it increases to its maximum. After an abortion or successful resolution of pregnancy, hCG reveals its presence in the urine and blood of a woman for three weeks. This should be taken into account by women who have spontaneous miscarriages, but they hope to save the fetus or, conversely, are afraid that part of the egg remains in the uterine cavity. The best time to test The time of day when to do a pregnancy test is recommended by the manufacturer. Everything depends on the type of test and its sensitivity. If you carefully read the instructions attached to the test strip, the time of the test is written there. Jet tests marked 10 mIU / ml have a high degree of sensitivity, and the time of urine collection for them does not make a significant difference. After the urine hits the sensitive part of the strip, a reaction begins that will show the result, whether the woman is pregnant or not. Day to do the test To accurately determine whether a woman is pregnant using a test strip at home, you need to wait for the first day of the expected menstruation. If the discharge has not started, then on the first day of the delay you can determine whether the egg was fertilized or not. The sensitivity of tests for the presence of hCG also plays a role in this process. If you buy a test strip with a sensitivity of 20-25 mIU / ml at the pharmacy, it will be able to determine the presence of an embryo in the uterine cavity from the first day of the delay. More sensitive tests with 10 mIU / ml, more expensive, can determine whether conception has occurred a week after the expected fertilization of the egg should have occurred. If a week has passed from the expected period, which has not started, you can buy a test of any sensitivity. Its result will be correct. A blood test for hCG a week after the expected conception can be done at a women's consultation center for a fee. Testing is carried out in the laboratory of the IVF clinic, in medical diagnostic centers.
What are the tests for pregnancy, and how to use them
You can buy strip tests in pharmacies, orTest strips. This is one of the most common tests that women buy when they need to determine whether the egg has been fertilized. The strip is lowered to the desired mark in a jar with morning urine. Hold it there for a few seconds, then pull it out and put it on a flat surface. After a while, you can pick up the strip and look at the result. All types of tests have the same principle: one strip - no pregnancy, two strips - pregnancy is. If the test shows a negative result, do not throw the strip in the bucket. Put it on a flat surface until the evening. Very often, the reaction is slower than a woman would like, or there is still little hCG in the urine. Practice shows that the second strip may appear weak and later. This means that pregnancy has occurred. If you repeat the test, the strip will become much brighter in a week. Tablet tests are designed on the same principle as strip tests. The difference is that the test strip is enclosed in a tablet. To conduct the test, drip morning urine into the middle and look at the result after some time. Jet tests are sensitive tests. They are convenient in that they are simply placed under a stream of urine, at any time of the day or night, wait a little and look at the result. Which pregnancy test to choose The choice of test depends on how many days have passed since the expected conception and personal feelings. Sometimes a woman knows for sure a week after conception that she is pregnant. Sometimes she does not suspect that conception has occurred until a delay in menstruation tells her that some changes are happening to her body. If the delay is long, then there is no point in choosing a special test at the pharmacy. Any of them will show pregnancy. If you really want to determine, but a little more than a week has passed, you need to buy a sensitive pregnancy test and satisfy your curiosity. You can go to the lab and get tested for hCG, which will be 100% accurate Ectopic pregnancy and testing Ectopic pregnancy is also determined by a test strip. If a woman feels abdominal pain or bleeding starts 7-8 weeks after conception, she should immediately call an ambulance. Pulling pains and bloody discharge with a positive result should be a warning sign. You should contact a gynecologist in advance to rule out an ectopic pregnancy. A woman's awareness of pregnancy in the early stages gives her the opportunity to plan her future life, register with a women's health clinic, take all the tests and bear a child in order to become a mother.
