Serum or plasma concentration of **progesterone** (total)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test to evaluate hormone balance, diagnose fertility issues, check for pregnancy, or monitor conditions like polycystic ovary syndrome (PCOS) or hormonal imbalances. It’s often done during the menstrual cycle or in response to symptoms like irregular periods or missed cycles.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the draw if your lab requires it. Bring any medications or supplements you’re taking, as they could affect results. Avoid smoking or caffeine before the test if instructed.

What Happens During the Test

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but the process is quick. The blood is then sent to a lab for analysis. Results are typically ready within 1–3 business days.

What the Results Mean

Results are compared to a reference range specific to your cycle phase (e.g., pre-ovulation, mid-cycle, or post-ovulation). Low levels may suggest ovulation issues, while high levels could indicate pregnancy or certain hormonal disorders. Always discuss results with your provider—they’ll interpret them in the context of your health.