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What Hormone Do Pregnancy Tests Look for?

Pregnancy tests look for human chorionic gonadotropin or HCG, which is produced by the placenta. A blood or urine test can detect HCG, explains Dr. Kecia Gaither, Director of Maternal Fetal Medicine in the Department of Obstetrics and Gynecology at Brookdale University Hospital in Brooklyn, New York. The amount of HCG increases each day after conception.

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