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Pituitary responsiveness to gonadotrophin releasing factor (GnRH) in puerperium.

Administration of a single dose of Gondotrophin Releasing Factor (GnRF) failed to induce an increase in serum FSH immediately postpartum suggesting pituitary refractoriness. However, multiple injection of GnRF resulted in significant FSH increments but these were less than the FSH responses to a single injection of GnRF in normal menstruating women.