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In vitro fertilization was attempted during a spontaneous cycle in 17 out of 97 patients. Preovulatory urinary estrogen and LH maximas were assayed in order to time celioscopy 24 hours after the onset of the triggering urinary LH maxima. In 8 patients, comparison with plasmatic LH shows that the timing of spontaneous ovulation can be precisely predicted from urine assays. However, when the triggering LH release is weak, LH must be above or equal to 25 IU/g of creatinine with a creatininuria above or equal to 0.4 g/l in two urine samples at a three-hour interval.
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