Progesterone

You should get a progesterone test if you have difficulty conceiving, irregular periods, or recurrent miscarriages, to check whether you are ovulating. It is also recommended in early pregnancy with bleeding or abdominal pain, to assess miscarriage or ectopic pregnancy risk, and for monitoring fertility treatment or progesterone therapy.

No fasting is required for a progesterone test. To check ovulation, give your sample on day 21 of a 28-day cycle, or about 7 days before your expected period if your cycle is longer or shorter. Inform your doctor about oral contraceptives, hormone therapy, fertility medicines, or pregnancy. Stop biotin supplements 48–72 hours beforehand.

No, fasting is not required for a progesterone test. You can eat and drink normally before giving your sample. However, timing matters: to check ovulation, the test is usually done on day 21 of a 28-day cycle, or about 7 days before your expected period. Stop biotin supplements 48–72 hours beforehand.