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Objective This study aimed to define the conditions that increase the possibility of receiving a blood transfusion in patients who had a cesarean section. Methods This study was conducted between January 2016 – May 2020 in a university hospital located in Konya, Turkey. Pregnant women undergoing cesarean section were included. Of 4303 eligible patients, 188 women were the transfused group and 4115 women were the non-transfused group. Logistic regression analysis was performed for potential confounding factors. Results A total of 4303 eligible patients were evaluated in this study. There were 4115 patients (95.6%) in the non-transfused group. The transfused group consisted of 188 patients (4.4%). The probability of transfusion was higher in pregnant women with placenta previa, placenta accreta spectrum, thrombocytopenia, preoperative anemia, macrosomia above 4500 g, and multiple gestations [adjusted OR values (95% CI); 10.58 (range 4.75–23.57), 7.75 (range 3.22–18.61), 7.85 (range 3.46–17.79), 5.71 (range 4.21–7.74), 4.22 (range 1.21-14.67) and 2.10 (range 1.18-3.72), respectively]. There was no increase in the possibility of transfusion in 4000–4500 gram macrosomia, uterine fibroids, preeclampsia, premature rupture of membranes, previous cesarean sections and gestational diabetes mellitus. Conclusion Placenta previa, placenta accreta spectrum, thrombocytopenia, preoperative anemia, macrosomia above 4500 g and multiple gestations increase the possibility of transfusion. Perioperative blood preparation is vital in such patients. Prevention of anemia during pregnancy is critical in reducing transfusions.

Conditions that increase the risk of cesarean-related blood transfusions: a single-center cohort study