Abstract:Objective To investigate RhD negative blood type distribution of inpatients in a first-class grade-three hospital in Changsha. Methods The DiaMed gel card and test tube methods were used to detect blood type of patients from January of 2011 to April of 2015. Results A survey of blood samples of 255,179 inpatients showed the distribution of O>A>B>AB, and there was no significant distribution difference between female and male (P > 0.05). Among those patients, there were 1,470 RhD negative individuals, which accounted for 0.58% in all inpatients. Blood group A RhD negative [A(-)] had the highest distribution of 0.22%, followed by O(-) and B(-) with 0.20% and 0.12% respectively, and the lowest distribution of 0.04% was AB(-). The RhD negative ratio of female was higher than that of male. RhD negative distribution in ABO system was different between male and female; the order in male was B>O>A>AB, while the order in female was A>O>AB>B. Among all RhD negative patients, the majority of the patients were obstetric patients accounting for 28.23%, followed by neurosurgical patients (16.63%) and general surgery patients (7.91%). Conclusions High frequency of RhD negative blood type is found in inpatients. The frequency of female is higher than that of male, and it is mainly distributed in Obstetrical Department. There is significant difference between female and male in the distribution of RhD negative in ABO blood group system, which needs further study.