eng Oriental Scientific Publishing Company Biomedical and Pharmacology Journal 0974-6242 2017-12-21 10 4 2129 2134 10.13005/bpj/1337 18261 article Ayla Bahramian 1 Parisa Falsafi 2 Mahdi Rahbar 3 Fatemeh Dabaghi-Tabriz 4 Mohammadreza Daeioughli-LeilAbadi 5 Masoumeh Mehdipour 6 Department of Oral Medicine, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran Department of Operative and Esthetic Dentistry, Faculty of Dentistry, Tabriz University of Medical Science, Tabriz, Iran Private Practitioner, Tabriz, Iran Department of Oral Medicine, Faculty of Dentistry, Shahid Beheshty University of Medical Sciences, Tehran, Iran This study aimed to investigate Association of ABO blood grouping in patients with recurrent aphthous stomatitis referring to Oral Medicine department of Tabriz Dental Faculty. In this cross sectional study blood group (ABO) of 75 patients with recurrent aphthous stomatitis was determined and the data obtained from the study were analyzed by using descriptive statistics (frequency-percent). The software used for statistical analysis was SPSS 17. 31 patients (41.3%) with RAS had blood group A, 21 patients (28%) had blood group B, 3 (4%) had blood group AB and 20 patients (26.6%) had blood group O. The frequency of A blood group was highest among patients with RAS and AB blood group was lowest. The ABO blood group system is very important in organ transplantation, blood transfusion and in other cases such as determination of the immunologic characteristics of the body, in relation to various diseases, cancers etc. we can use this property for diagnosis of diseases. https://biomedpharmajournal.org/vol10no4/association-of-abo-blood-grouping-with-recurrent-aphthous-stomatitis/ Blood Group Recurrent Aphthous Stomatitis Tabriz Dental Faculty