Abstract
BACKGROUND: Follicular size has been a marker used to time hCG administration during IVF cycles. HCG is commonly given to trigger final oocyte maturation when the lead follicle reaches 18 mm. In cycles with a single lead follicle that is significantly larger than remaining follicles (trailing cohort), this may result in premature triggering and recovery of immature oocytes from the trailing cohort.
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