Human chorionic gonadotrophin (hcG)
Human chorionic gonadotrophin (hcG) is the hormone that is detected in both urine and blood pregnancy tests.
Urine pregnancy tests will be positive if a certain amount of hcG is detected. False positive far rare because we only have hcG in our systems if we are pregnant.
Blood tests can be qualitative or quantitative, meaning they will confirm or deny the presence of hcG or they can tell the actual level of the hcG. The level of hcG in your blood stream can help your healthcare provider to pinpoint how far along your pregnancy is.