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In a previous paper(Kim et al., 1977), ovulation score method was studied as a new natural contraceptive measure that is arranged of ovulation symptoms and menstrual period. It is based on the known characteristics change of fertile(cervical) mucus, intermenstrual abdominal pain(Mittelschmerz), intermenstrual genital bleeding(Kleine-Regel) and breast engorgement or fullness during the menstrual cycles. This paper attempts to determine whether the ovulation symptoms in ovulation score method are clossely related to the hormonal estimated ovulation time, and asses the usefulness of the ovulation score method as a natural contraceptive measure. In this study, 75 healthy fertile women were studied during 78 menstrual cycles. The ovulation score method, assessed by the patient and used in conjunction with basal body temperature, was correlated with serum levels of luteinizing hormone(LH) during periovulatory period. As a preliminary experiment, serum LH levels of the 3 women with normal menstrual cycle were also measured with double antibody technic radioimmunoassay. The results were as follows: 1. Mean serum LH levels of the 3 women with normal menstrual cycle were 26.1mIU/ml in the follicular phase, 61.0mIU/ml in the ovulatory phase and 28.2mIU/ml in the luteal phase. 2. The LH peak was noted on average 0.8 days before the estimeted ovulation date in basal body temperature chart. 3. The appearance of fertile mucus occured on average 5.7 days before the LH peak, and the fertile mucus peak day was noted on average 0.42 days before the LH peak. 4. The peak symptom day of Mittelschmerz was noted on average 0.4 days after the LH peak. 5. The peak symptom day of Kleine-Regel was noted on average 1.3 days after the LH peak. 6. The first day of breast engorgement was noted on average 5.3 days after the LH peak. 7. The mean interval from the first recorded ovulation score 5(possible fertile score) to the LH peak was 6.8 days and from the LH peak to the last recorded ovulation score 5 was 5.6 days. 8. Calculat
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