Background: Blood grouping, Bleeding and Clotting time are routinely performed useful hematological tests, mainly done before blood transfusion and any surgery in hospitals. Aims and Objectives: To determine the blood group and to evaluate the association of ABO blood groups with BT and CT among medical students. Materials and Methods: This study was conducted on medical students, in the Department of Physiology at Karwar Institute of Medical Sciences (KRIMS), Karwar. Total of 299 medical students participated. Out of which 161 were males and 138 females. Blood was collected by finger prick method. Blood grouping was done with the standard anti sera technique. BT and CT were determined by the Duke’s filter paper method and Wright’s capillary glass tube method respectively. Blood group distribution was expressed in percentage and their correlation with BT, CT was analyzed by Chi­square analysis and Z­test. Results: In our study it was found that the percentage distribution of ‘ABO’ blood group showed predominance of blood group ‘O’ followed by ‘B’, ‘A’ & ‘AB’. Our study also shows that bleeding and clotting times are influenced by blood group and gender. Bleeding time was more in females than males and it was statistically significant (p<0.0180). Bleeding time was more in females of blood group O and B, but it was statistically significant only in O blood group (p<0.0016). Clotting time was more in females than males and it was statistically significant (p<0.0118). Clotting time was more in ‘O’, ‘B’ & ‘AB’ blood group in females as compared to males & it was statistically significant (p<0.05). Conclusion: In our study, O was the most common while blood group AB was the least. Bleeding time was more in females of blood group O and B, but it was statistically significant only in O blood group. Clotting time was more in ‘O’, ‘B’ & ‘AB’ blood group in females as compared to males and the difference was statistically significant. 

Keywords: ABO Blood Group; Bleeding Time; Clotting Time; Medical Students.