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Progesterone

Serum Progesterone Luteal Phase Progesterone
Serum (SST; day 21 for confirming ovulation) nmol/L

About this test

Produced by corpus luteum after ovulation. Peak luteal-phase level (day 21 of 28-day cycle, or 7 days before expected period) confirms ovulation. Used in recurrent miscarriage and IVF.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs See notes Non-ovulatory cycle (follicular/male): <3; probable ovulation: ≥16; adequate luteal phase: ≥30 (lab-specific)

Clinical Interpretation

Low / Decreased
Low mid-luteal — anovulation, luteal phase deficiency, diminished ovarian reserve.
High / Increased
Elevated in males or early follicular — adrenal overproduction, ovarian tumour.

Related Tests

Oestradiol
Specimen
Serum (SST; day 21 for confirming ovulation)
Reporting Unit
nmol/L
Category
🔄 Hormones

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.