Ultrasonographic monitoring of ovum release was performed in two consecutive cycles in each of 220 patients treated with gonadotrophin. Definite release occurred in 69% of cycles, indeterminate in 24% and non-release in 7%. Support for the accuracy of sonography in diagnosing the luteinized unruptured follicle (LUF) was demonstrated by a much higher pregnancy rate in those patients showing ovum release. There was a definite tendency for non-release to recur in the next cycle. Thus, the data support the routine use of sonography 2-3 days after human chorionic gonadotrophin (HCG) injection to monitor ovum release in gonadotrophin-treated patients (HMG).
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Check et al. (1990) studied this question.