There are currently many methods available for detecting pregnancy, such as pregnancy tests, B-ultrasound, and blood routine examinations. The pregnancy test stick can only be used after 7 to 10 days of amenorrhea, while B-ultrasound can only be detected after about a month. Unlike blood routine examination, it can be detected as long as the fetus implants successfully. So is it accurate to check HCG 9 days after sexual intercourse?
Is it accurate to check HCG 9 days after sexual intercourse
HCG refers to human chorionic gonadotropin, which is composed of alpha and beta dimer glycoproteins. After a woman becomes pregnant, the hCG that originally existed in the blood and urine will fluctuate with the increase of gestational age. Therefore, the change of hCG can be used to determine whether a woman is pregnant. Blood hCG testing can be done 8-10 days after sexual intercourse, which is earlier than the 35 day qualitative urine test with ordinary early pregnancy test strips. Therefore, blood hCG testing can be used to make corresponding measures for pregnancy earlier.
When will blood hCG be checked
1. Determine pregnancy - as early as 8-10 days after sexual intercourse
The best time for a blood hCG test is 8-10 days after sexual intercourse, at which point the test can be used as a pregnancy test to confirm pregnancy. Meanwhile, during the first 3 months of pregnancy, this examination can also be used to diagnose single or multiple pregnancies.
2. Abnormal pregnancy diagnosis - measuring hCG levels every 2 days to see if they have doubled
After conception, the β - hCG value in the blood can be measured to increase from the 9th to the 11th day, and the β - hCG value can increase by 2 times every two days thereafter. If a slow increase rate is detected for two consecutive times at this time, it may be caused by factors such as ectopic pregnancy, abnormal embryos, or intrauterine growth retardation.
3. Down syndrome screening -15-20 weeks of pregnancy
Down syndrome screening calculates the risk value of Down syndrome in fetuses by detecting the levels of AFP and β - hCG in venous blood.
Is it accurate to check HCG 9 days after sexual intercourse? Fetal implantation does not take too long, about a week, so HCG concentration can be checked 9 days after intercourse, but there is also an error and the probability is not high. If a blood routine test does not detect any changes in HCG concentration after sexual intercourse, there is a high chance that women will not become pregnant.
