Normal variation in the length of the luteal phase of the menstrual cycle: identification of the short luteal phase

What this work gives Aellic

Luteal length 14.13 ± 1.41 d — measured from the LH PEAK. Aellic has no LH test and must therefore use bull2019 (12.4 d from estimated ovulation); mixing the two anchors would shift every phase boundary by ~2 days. This anchor trap is exactly why `LUTEAL_LENGTH_DAYS = 12` rather than the reflexive 14. No DOI: published in 1984, before this journal assigned them.

Where this sits in the engine

1 declared site — constants and thresholds in the code that point at this entry.

• Cycle Phases and cycle-aware baselines 1 site