A progesterone test is a blood test that measures its level in the blood. Progesterone plays an important role in pregnancy and fertility. Men also make progesterone but in much smaller amounts.
A progesterone test is used to find the cause of infertility in both men & women, monitor a high-risk pregnancy, find out the days of ovulation, and diagnose an ectopic pregnancy. The levels greater than normal can be indicative of ovarian cancer and cysts apart from pregnancy. If progesterone levels do not rise and fall on a monthly basis, a woman may not be ovulating nor having regular menstrual periods. This may be a cause of infertility.
The progesterone levels keep on fluctuating throughout your pregnancy and menstrual cycle, you may need to be retested several times.