Progesterone

Produced after ovulation and low for most of the month, which makes the day it is taken most of the test.

Progesterone in the Biomarker Guide — what it is, why it is tested, and what moves the number.

Add-on markers can only be added to venous samples.

Timing

Cycle day matters: day 21 of a 28-day cycle is standard.

Turnaround: the lab reports this test within 24 hours of receiving your sample, counted in working days. Most samples reach them within about 3 days of posting. Full detail on our Turnaround Times page.

We do not interpret results. Not medical advice or a diagnosis.