Purpose: To determine the ABO blood group from the dental pulp of extracted teeth at various time intervals by Absorption-Elution technique. Method: Extracted teeth (50 permanent and 50 deciduous) were collected and longitudinally sectioned. The pulp was scooped and used for blood grouping by Absorption-Elution technique. The blood grouping was done at intervals of, day one of extraction, day 14, day 30, day 90 & day 180 respectively. Blood from the freshly extracted socket was soaked with gauze which served as the control. Results: Overall, ABO blood groups could be identified from 88% of permanent teeth and 44% of deciduous teeth. As the time interval increased the number of positive results obtained decreased. Conclusion: The permanent teeth furnished higher percentage of positive results than the deciduous teeth, on the same day of the extraction and on the 14th day after the extraction respectively.

Keywords: Odontology, Human identification, Pulp, ABO blood grouping, Absorption - Elution technique.