Human chorionic gonadotrophin (hCG) is a hormone secreted into the blood by the chorion layer and the placenta. The main function of hCG is the stimulation of corpus luteum to allow the continuous secretion of estrogens and progesterone. This is necessary to inhibit menstruation and to allow the proper attachment of embryo to the uterine wall. The highest concentration of hCG is observed around the ninth week of pregnancy. The concentration tends to decrease in the fourth or fifth month of pregnancy.
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