Progesterone, Serum (Mass Concentration)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test to evaluate reproductive health, diagnose conditions like polycystic ovary syndrome (PCOS), check for ovulation issues, or monitor pregnancy-related hormone changes. It might also be used in fertility treatments or to investigate symptoms such as irregular periods, missed periods, or unexplained infertility.

When to Expect Results

Results are typically available within 1 to 3 business days, depending on your lab. Follow-up with your healthcare provider to discuss the findings and next steps.

Common Reasons for Testing

Progesterone testing is often done during the luteal phase of the menstrual cycle (around days 21–25 of a 28-day cycle) to confirm ovulation. It can also be checked during early pregnancy to assess uterine lining preparation or to diagnose conditions like luteal phase deficiency.

Sample Preparation and Timing

For best accuracy, blood should be drawn during the late follicular or early luteal phase of your menstrual cycle. Avoid testing during menstruation or shortly after ovulation. Fast for 8–12 hours before the test if instructed by your provider.