Gender test strip accuracy rate

For women, if they suspect they are pregnant, they can use early pregnancy test paper to test. This early pregnancy test paper can only detect whether the woman is pregnant or not, but it cannot determine the gender of the fetus. In addition, it is illegal to detect the gender of the fetus in advance in our country. Currently, the gender ratio in our country is seriously unbalanced. In some areas, the idea of ​​favoring boys over girls is quite serious, so the gender of the fetus cannot be detected during pregnancy.

Is it accurate to use test strips to determine gender?

The test strip can only detect whether you are pregnant, but it cannot detect the gender.

To know how long it takes for an early pregnancy test to detect pregnancy, you must first understand how long it takes for HCG to be produced after pregnancy.

1. Waiting time for sperm and egg to combine after intercourse: 1-3 days. After intercourse, it takes some time for the sperm to merge with the egg. Sometimes he may have to wait for 72 hours for the shy egg to mature and come out (ovulate) before he can have sex.

2. The time it takes for the fertilized egg to pass through the fallopian tube and enter the uterus: 3-4 days. After the sperm and egg successfully combine, the fertilized egg develops and moves through the fallopian tube toward the uterus, and it takes about 3-4 days to reach the uterus.

3. The time the fertilized egg wanders in the uterus: 2 to 3 days. After the fertilized egg enters the uterus, it will wander around in it for a while before it finds a place to settle and finally implants in the uterus.

4. After implantation, the fertilized egg is connected to the uterus through the placenta. The placenta produces HCG. HCG will appear in the urine, but the concentration is very low at the beginning. Sometimes the early pregnancy test paper will not be able to detect it, or only two lines will be shown, one dark and one light. The lighter ones may be very light and almost invisible. Some people also call this faint bar a "watermark".

Therefore, HCG can only be produced after sexual intercourse and successful implantation. You can find out by adding up the days above. How long after sex can I test for pregnancy?

1. If fertilization occurs early and implantation also occurs early, HCG will appear in the urine about 7 days after intercourse, but the concentration is very low at this time and it is difficult to detect it with an early pregnancy test. Therefore, you need to wait at least 2 to 3 days until the concentration is higher before you can see two bars, one dark and one light. Therefore, the earliest pregnancy test can detect pregnancy about 10 days.

2. If both ovulation and implantation are delayed, some people may need about 15 days to detect pregnancy.

Improving the accuracy of early pregnancy test strips

1. Pay attention to the production date on the packaging box and do not use expired pregnancy test strips.

2. Read the instructions carefully before doing the self-test, and then follow the instructions carefully.

3. If you do an early pregnancy self-test at night, the accuracy will be affected to some extent, while using morning urine will produce more accurate results.

4. Many early pregnancy test strips indicate that women can do early pregnancy self-tests 1-2 days after missing their normal menstrual period. If the self-test result is negative and menstruation still has not occurred after one week, you should do the self-test again.

5. If pregnancy has just begun, or there is an ectopic pregnancy, the urine to be tested needs to be left to stand for more than 3 minutes (generally only 1 minute is needed), and carefully identify whether there is a weak positive, that is, the color of the test area is lighter than the color of the control area, or it only appears faintly.

6. Pay attention to positive self-test results caused by non-pregnancy factors, such as blood in the urine, endometrial hyperplasia, ovarian tumors, recent pregnancy, missed abortion or incomplete abortion, etc.

7. Avoid diluting urine. Drinking too much water can dilute your urine and cause a false-negative result.

8. Performing the test in the morning or evening may have a certain impact on the results. The highest HCG value is generally found in morning urine, so many instructions recommend testing in the morning, but this is not absolute.

9. When testing, pay attention to the length of the test paper immersed in urine. Sometimes the length of urine that submerges the test strip is too long, which may make the test result difficult to judge

10. If you have been pregnant before, determine whether you are pregnant based on the test results. Because HCG can remain positive for a long period of time after termination of pregnancy (after delivery, spontaneous abortion and artificial abortion).