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Background: The detection of timing of ovulation is an important step in the evaluation and management of subfertility. Ultrasonography plays a vital role in monitoring follicular growth. Aims: To assess the value of ultrasound scanning of the ovaries in the periovulatory period to detect ovulation and to correlate the results with basal body temperature (BBT) chart and other presumptive evidences of ovulation. Methods: In this prospective study, a total of 60 subfertile patients were selected from the outpatient department of obstetrics and gynaecology, BPKIHS, Dharan. BBT charting, midcycle abdominal pain record & premenstrual endometrial biopsy were performed in all patients i.e. in spontaneous ovulating and anovulating (induced later). Ultrasonographic periovulatory follicular tracking was usually started around 10 th day of the cycle. The results were then correlated with BBT mainly and also with mittelschmerz and endometrial biopsy. Results: In this series fifty five patients, who demonstrated sixty ovulations (with failed inductions in five patients) wer