HCG, known in Chinese as human chorionic gonadotropin, is a hormone
secreted by the placenta. It can be detected from the maternal serum 10 days
after fertilization of the egg. It is the most sensitive method for the
diagnosis of early pregnancy.
HICG plays a very important role in the growth and development of the fetus
and the mother-to-be. HCG can promote the continued secretion of estrogen and
progesterone in the corpus luteum of the maternal ovary, and promote the
endometrium to receive embryo implantation. HCG can stimulate corpus luteum
cells, maintain the life of corpus luteum, and make it develop into gestational
The higher the HCG, the better?
Since HCG has so many functions, is the higher the HCG the better? Not
Maternal blood HCG changes significantly at different stages of pregnancy.
In the absence of pregnancy, HCG<5IU/L, or not measured at all. On the 6th
day after pregnancy, the villous trophoblast cells began to secrete trace
amounts of HCG, and HCG was detected in the blood on the 10th day. After
implantation, HCG levels in the pregnant mother's blood increased exponentially,
peaking at 8 weeks, and then maintained slowly until 12 weeks. After 12 weeks,
maternal blood HCG decreased rapidly. The concentration of HCG was only 10% of
the peak in the middle and third trimester of pregnancy. Within 2 weeks after
delivery, it returns to its pre-pregnancy level, which is undetectable.
Specific value can refer to: pregnancy 7 ~ 10 days >5IU/L, pregnancy 30
days >100IU/L, pregnancy 8 ~ 10 weeks is 50000 ~ 100000IU/L, pregnancy 14
weeks is 10000~20000IU/L.
Individual differences in HCG concentration are very large, that is to say,
absolute differences in serum HCG between expectant mothers are very large.
Therefore, after receiving the HCG report, expectant mothers should make a
longitudinal comparison with their own gestational week to see the variation
pattern of HCG, instead of comparing with their pregnant friends.
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