A serum pregnancy test is a medical procedure that is used to detect the presence of the hormone human chorionic gonadotropin (hCG) in your blood, which is a good indicator of whether you are pregnant or not. There are several synonyms for a serum pregnancy test, including a blood pregnancy test, hCG test, or a pregnancy blood test. These tests are commonly used by doctors to confirm a pregnancy, and they are often more accurate than at-home pregnancy tests. If you suspect that you may be pregnant, it is important to consult with your doctor about whether a serum pregnancy test is the right choice for you.