Q: What causes low Progesterone?

Anovulation, luteal phase defect, ovarian insufficiency.

Q: What causes high Progesterone?

Pregnancy, ovarian cysts, rare adrenal tumors.

Q: When should I see a doctor about Progesterone?

For cycle problems, infertility workup, or to confirm ovulation (day 21 test).

Question 1

What is Progesterone?

Accepted Answer

Progesterone is the hormone of the second half of the menstrual cycle and pregnancy, produced by the corpus luteum. It prepares the uterus for implantation.

Question 2

What are the normal Progesterone levels?

Accepted Answer

Women: follicular phase < 1 ng/mL, luteal 2–25 ng/mL, pregnancy much higher. Men: < 1 ng/mL. (ng/mL)

Question 3

What causes low Progesterone?

Accepted Answer

Anovulation, luteal phase defect, ovarian insufficiency.

Question 4

What causes high Progesterone?

Accepted Answer

Pregnancy, ovarian cysts, rare adrenal tumors.

Question 5

When should I see a doctor about Progesterone?

Accepted Answer

For cycle problems, infertility workup, or to confirm ovulation (day 21 test).

Progesterone

Normal ranges

Causes of deviations

Low levels:

High levels:

When to see a doctor