This is an automatically translated article.
The article was professionally consulted by MSc Bui Nu Thanh Hang - Department of Obstetrics and Gynecology, Vinmec International Hospital Da Nang.
Usually, when women want to check if they are pregnant, women often use a pregnancy test or do a blood test of HCG levels. So why is it necessary to measure HCG levels to take a pregnancy test?
1. What is HCG? Why do you need to measure HCG levels to take a pregnancy test?
HCG stands for the hormone Chorionic gonadotropin in the human body and is produced during pregnancy. This hormone is made in the placenta after the egg is fertilized and attaches to the wall of the uterus. Therefore, the number indicating the concentration of HCG indicates that a woman's body is pregnant.After about 7 - 11 days from conception, HCG levels can be detected with a pregnancy test, after about 11 days, a blood test can be detected and after 12-14 days, a urine test .
When the fetus is newly formed, the amount of HCG is still quite low, but they will increase rapidly after a short time. Normally, the level of HCG in the blood doubles every 72 hours. This concentration will peak during the first 8 to 11 weeks of pregnancy, then it will gradually decrease and level off later in pregnancy.
Phát hiện HCG bằng que thử thai
2. Some things to know about HCG . levels
About 85% of women with a normal pregnancy, HCG levels will double every 48-72 hours. During pregnancy HCG levels will increase rapidly, after which the required doubling time may be as high as 96 hours.
However, once the HCG level stops increasing and shows signs of decreasing, it will level off for most of the rest of the cycle. It is completely normal for HCG levels to level off and results in a perfectly healthy baby. After 5-6 weeks of pregnancy, the pregnancy ultrasound will give more accurate results than using the HCG index.
For a normal and non-pregnant woman, an hCG level below 5 mIU/mL is considered negative. For pregnant women, the concentration is above 25 mIU/mL. If the HCG level is in the range of 6-24 mIU/mL, it should be checked and monitored for an increase in HCG levels and confirmed pregnancy.
The concentration of HCG in pregnant women is also very different, this index should not be compared with someone else who is pregnant because no one has the same HCG concentration. After every day and every hour this concentration has changed and is very different.
The important thing to consider is whether the HCG level is within the common average and if it will continue to rise in the following weeks. During the first 3 months, HCG levels are still elevated, which is a normal sign.
Trắc nghiệm: Sự thay đổi nồng độ beta HCG thay đổi theo tuổi thai
hCG là một hormon quan trọng được tiết ra khi phụ nữ mang thai. Nồng độ beta hCG được tính theo đơn vị mUI/ml. Hãy cùng theo dõi bài trắc nghiệm sau đây để biết được Nồng độ beta HCG thay đổi theo tuổi thai như thế nào?3 weeks: 5 – 50 mIU/mL 4 weeks: 5 – 426 mIU/mL 5 weeks: 18 – 7,340 mIU/mL 6 week: 1,080 – 56,500 mIU/mL 7 – 8 weeks: 7,650 – 229,000 mIU/mL 9 – 12 weeks: 25,700 – 288,000 mIU/mL 13 – 16 weeks: 13,300 – 254,000 mIU/mL 17 – 24 weeks: 4,060 – 165,400 mIU /mL 25 - 40 weeks: 3,640 - 117,000 mIU/mL The concentration of HCG over each period has a huge difference in the lowest and highest concentration. However, a gradual increase in concentration, then a gradual decrease and a start to level off also occurred at both the highest and the lowest levels. This shows that it doesn't matter if the HCG level is high or low, it only matters if the concentration increases, decreases, and slows down. These numbers are just a guide and HCG levels can lie anywhere. anywhere in this range. The specific number is not important, what matters is the change in each level.
Nồng độ HCG thay đổi theo thai kỳ
If the HCG level is low, it is necessary to monitor and check if it increases again in 48-72 hours within the first 3 months. Low levels of HCG can cause a miscarriage or ovulation can also be an ectopic pregnancy. High levels of HCG can lead to pregnancy or multiple pregnancies.
After delivery or miscarriage, HCG levels should return to normal in about 4-6 weeks, ie back to ≤ 5 mIU/mL.
The HCG level that signals pregnancy is definitely pregnant because errors are very rare. Only if an early miscarriage or certain types of cancer results in an erroneous result. Some medicines containing HCG can also affect these levels, but they are unlikely to affect pregnancy results.
If you have unusual symptoms, you should be examined and consulted with a specialist.
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