Human chorionic gonadotropin (HCG) is a glycoprotein hormone produced by the placenta during pregnancy. HCG can increase to 5 to 50 milliinternational units per milliliter (mIU/ml) about a week after conception, peaking at 100,000 to 200,000 milliinternational units (mIU/ml) at 10 weeks, and then rapidly declines after 12 weeks, maintained at 5,000-20,000 milliinternational units/ml (mIU/ml).
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