Progesterone is checked by drawing blood. Progesterone is secreted by the corpus luteum of the ovary, which enlarges after pregnancy in response to human chorionic gonadotropin secreted by the trophoblast cells of the embryo and transforms into the corpus luteum of pregnancy, which continues to secrete progesterone and support the embryo until it degenerates at the end of the third trimester. Therefore, progesterone is usually checked in early pregnancy, and is less of a concern in the middle and late stages of pregnancy. Progesterone is usually checked by drawing peripheral blood from the pregnant woman. There is no need to fast to check progesterone and the test is short, so you don’t have to wait long for the results. The blood test will give a specific value for progesterone. This is used to determine how the embryo is developing during the early stages of pregnancy. If the value of progesterone is low, supplement progesterone under the guidance of the doctor, so as to avoid the occurrence of preeclampsia or embryonic decontamination and other situations.