Which hormone's presence indicates pregnancy when detected by a home pregnancy test?

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The presence of human chorionic gonadotropin (HCG) in a woman's urine or blood is what a home pregnancy test detects to indicate pregnancy. HCG is a hormone produced by the placenta shortly after a fertilized egg attaches to the uterine lining. The specific detection of HCG is the key factor in home pregnancy tests, which are designed to identify this hormone at elevated levels, typically around the time of a missed menstrual period.

When pregnancy occurs, HCG levels rise rapidly, and its detection confirms that the body is undergoing changes necessary to support a developing pregnancy. Other hormones like estrogen and progesterone are also involved in pregnancy but are not the indicators tested for in home pregnancy tests. Alpha-fetoprotein is a marker often measured in prenatal testing but does not indicate pregnancy in the initial stages. Thus, HCG is specifically the hormone that indicates pregnancy accurately and reliably when detected.