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Venn diagram outlining number and overlap of cycles with clinical LPD (luteal duration <10 d in length), biochemical LPD (≤5 ng/mL luteal progesterone for all measured levels); and a more liberal definition of biochemical LPD (≤10 ng/mL luteal progesterone for all measured levels). International System of Units (SI) conversion for progesterone: 1 ng/mL = 3.18 nmol/L.
