The answer to the question is Human chorionic gonadotropin (hCG) test.
In a sample of your blood, the human chorionic gonadotropin (hCG) blood test calculates the amount of hCG hormone present.
Cells in the placenta that are growing during pregnancy produce hCG. The sac that feeds the fertilized egg and is attached to the uterine wall is the placenta.
About 11 days after conception, hCG can be initially seen in a blood sample. Every 48 to 72 hours, hCG levels continue to double. Around 8 to 11 weeks after conception, they reach their peak.
Following a decrease and plateau, hCG levels remain constant for the remainder of the pregnancy.
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