Guideline Summary: Ovidence of Ovulation, Lute‑Phase Insufficiency, and Progester‑One Therapy
Evidence of Ovulation Timing
- The patient experienced an LH surge of 45 IU/L on cycle day 13, which predicts that ovulation occurred within 24‑36 hours of the peak. 1
- Progester‑One (proxied by PDG) rose from 3.1 on cycle day 13 to 4.7 on cycle day 14, reflecting formation of the corpus luteum after follicular rupture. 1
Lute‑Phase Insufficiency and Timing of Progester‑One Supplementation
- A decline of progester‑One to 2.1 on cycle day 15, below the patient’s baseline of 3.2, indicates inadequate corpus luteum function. 1
- A drop in progester‑One within two days of the LH surge is considered evidence of lute‑phase insufficiency and warrants immediate lute‑phase support. 1
- The American College of Obstetricians and Gynecologists defines progester‑One concentrations < 6 nmol/L (≈ < 2 ng/mL) as inadequate lute‑phase function. 1
- Mid‑lute‑phase progester‑One should be ≥ 5 ng/mL (or an equivalent PDG concentration); values below this threshold denote lute‑phase insufficiency and require supplementation. 1, 2
Egg Viability and Timing of Intercourse
- The oocyte remains viable for approximately 12‑24 hours after ovulation. 3
- Inter‑partner intercourse occurring 24‑48 hours after ovulation falls at the outer limit or beyond the egg’s viable window, reducing the likelihood of conception. 3
Implications of Progester‑One Supplementation
- Exogenous progester‑One does not impede sperm from reaching or fertilising a still‑viable oocyte. (This principle is acknowledged in clinical practice, although the specific reference was omitted in the source.)
- Initiating progester‑One on the afternoon of cycle day 15 is appropriate because the observed progester‑One decline indicated lute‑phase insufficiency. 1
- Progester‑One supplementation can artificially elevate serum progester‑One levels, which may complicate interpretation of endogenous hormone trends. 1