Most women are trying to learn about her pregnancy as early as possible. The reasons for this interest are different. But curiosity takes over, and they try to quickly purchase the special tests. You first need to understand how they work and then decide when to do a pregnancy test?
How does a pregnancy test?
The pregnancy Test works on the principle of determination of human chorionic gonadotropin (HCG). As a rule, the sensitivity of the tests is not greater than 25 mIU/ml. HCG begins to produce after the embryo attaches to the uterus. Moreover, the level of this hormone doubles every day. Therefore, if ovulation was on day 12 of the cycle, the fertilized egg is implanted in 8 days.
HCG starts to increase from 20 days from the beginning of the previous menstrual period. At this time his level is 2 mIU/ml at day 21 – 4 mIU/ml. every day the amount doubles. As a result, on day 24 the level of HCG is above 25 mIU/ml that is how much and can freeze a pregnancy test. But there are products that define and 20 mIU/ml. However, you need to understand that ovulation can occur on day 14, and another 15 day cycle. In addition, the path of a fertilized egg to the uterus can take as little as 8 and 10 days.
Take a pregnancy test at night or morning?
To do the test, you should wait a few days after the delay. By this time the female body produces sufficient amount of human chorionic gonadotropin, which can be identified in the urine using the test.
On the packaging of most products indicate that they are accurate to 99% and can spend the first day of delay. But scientists have proven that this statement is not true. Through research it was found that 18 of pregnancy tests, only one sensitive enough to determine the level of HCG, which happens on the first day of delay many pregnant women. The rest of the tests were able to detect pregnancy at this time only in 16% of cases.
However, if ovulation was early, you know the presence of pregnancy even before the delay of menstruation. At this time, the test may show a weak second strip. And for late ovulation in the first few days of a delay it will only show one bar. Therefore, experts at negative result it is recommended to repeat the test after a couple of days. the women think, morning or evening to do the pregnancy test? the Highest concentration of HCG was observed after sleep. Therefore, the test should be done on morning urine.
In addition, before diagnosis, you need to check the expiration date and package integrity, as the ingress of the test deteriorates. First, you need to read the manual because different brands of tests can be used in different ways.
Impact of time of day to use a pregnancy test
Nearly all women try to quickly tell if a pregnancy. But at an early period it is advisable to comply fully with the instructions for the test. Making a pregnancy test, it is worth remembering that in the morning urine, the HCG concentration is greater and, therefore, the accuracy of the result is much higher. However, if there is high latency this test will show pregnancy, both day and night.
But still you need to follow some requirements:
- A pregnancy Test should be performed on fresh urine. Before the study should not be used diuretics or eat watermelon, otherwise the urine will be diluted, and can result in an incorrect result.
- Before performing diagnostics should not urinate for three to four hours. During this time the urine will be able to concentrate.
- In some cases, the reliability of the product is influenced by conditions and the shelf life test.
- before testing, please read carefully the regulations thereunder.
- Observance of all these conditions increases the reliability of the result.
Error results of pregnancy tests
Sometimes pregnancy tests show questionable results. This can happen for a number of reasons:
- too early diagnosis (even in the presence of pregnancy test shows a negative result);
- violation of rules for use of tests described in the instructions;
- using low-quality tests;
- the presence of diseases that increase the concentration of HCG, or the application of preparations containing this hormone.
In this case, you must purchase another test and run diagnostics on all the rules. It is advisable to do some tests, and different manufacturers. This effectively eliminates the possibility of error.
It Should be noted that a negative result does not mean no pregnancy. So if your period has not arrived, experts recommend repeated diagnostics. It is also advisable to consult a doctor for an accurate diagnosis.