Progesterone is a steroid hormone produced in the corpus luteum and the adrenal glands. Its main role is to prepare the body for and support a pregnancy. It is produced in increasing amounts in the second half of the menstrual cycle. Progesterone is normally tested on day 21 of your menstrual cycle to assess whether ovulation has taken place.
Although progesterone is considered a female hormone, men also produce progesterone in the adrenal glands and the testes. Progesterone in men plays a role in testosterone production.
What might a low result mean?
Progesterone is lowest at the beginning of the menstrual cycle and reaches a peak 7 days before a woman's period is due if ovulation has taken place. This is day 21 of a 28 day cycle, many women take a progesterone test at this time to see whether ovulation has occurred.
Low progesterone in men may affect testosterone levels resulting in symptoms such as loss of libido, inability to gain muscle and erectile dysfunction.
What might a high result mean?
A result of 30 or more signifies that ovulation almost certainly occurred. If your result is above normal it may indicate that you are pregnant as progesterone rises very rapidly if conception has taken place.
Elevated progesterone in men may be as a result of prescribed progesterone for managing a prostate condition or for infertility.