An attempt was made to detect ovulation in 106 normally menstruating women by studying a single endometrial aspiration smear taken just before an endometrial biopsy or D & C on about day 24 +/- 2 of the menstrual cycle. The interpretation of the smears was compared with the histology, and a correlation was observed in 92% of the cases. It is therefore concluded that a single endometrial aspiration smear can be used to detect ovulation. It is an easy, quick, accurate and practical method and can be repeated as often as required.
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