Menstruation related periodic bleeding from the blood vessels, at the time ofshedding of the uterine mucosa has focussed interest, more especially in the haematologicalchanges during different phases of menstrual cycle.. Aim of the study: The estimation of bleeding time & clotting timein different phases of menstrual cycle. Materials and Methods: The study was conducted on 30 female subjects in the age group of 14 – 35years. Bleedingtime estimated by Duke’s filter paper method and clotting time by Wright’s capillary tube method which were measured in three phasesduring a single menstrual cycle and were followed up. Results: mean bleeding time at secretary phase was significantly (P< 0.05) less as compared tomenstrual and proliferative phases.Whereas, mean clotting time at proliferative phase was 2.16±2.28 minutes, which was comparatively less than menstrual and secretary phases with statistical significant difference.