Corpus Luteum Deficiency (CLD)

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 7, 2026

Insufficient progesterone production from the corpus luteum during the luteal phase, resulting in inadequate endometrial support for implantation and early pregnancy. CLD is a structural problem at the level of the corpus luteum itself. Clinicians distinguish CLD from Luteal Phase Deficiency (LPD): LPD describes the hormonal pattern (low or short progesterone output), while CLD names the anatomical source of that deficit.

The corpus luteum forms from the ruptured follicle after ovulation. Its capacity to produce progesterone depends heavily on how well the follicle developed beforehand. A follicle that was small at ovulation, grew slowly, or was triggered prematurely produces a suboptimal corpus luteum. Treating luteal phase deficiency with progesterone supplementation alone, without addressing the follicular phase problem, manages the downstream effect but leaves the upstream cause untreated.

NaProTechnology identifies CLD through cycle-timed progesterone profiling: multiple measurements taken across the luteal phase rather than a single mid-luteal draw. A flat or declining progesterone curve identifies corpus luteum failure specifically. Treatment in RRM practice combines optimizing follicular development (ovulation induction when indicated) with post-Peak progesterone support timed to the chart.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.