['It has been shown that increased red blood cell distribution width (RDW) predicts adverse outcomes in cardiovascular disease and in patients undergoing a percutaneous coronary intervention. The aim of the present study was to assess the predictive value of preinterventional RDW on the development of in-stent restenosis (ISR) in patients undergoing stent implantation.', 'In this retrospective study, we compared 131 patients with ISR and 138 patients without ISR who had undergone bare metal stent implantation.', 'Preprocedural RDW was significantly higher in patients with ISR than those without restenosis (14.6±3.2 vs. 13.4±1.6%, P<0.001). Stent length was significantly longer in patients with than those without restenosis (17.9±5.6 vs. 16.2±5.2 mm, respectively, P=0.03). Compared with patients with restenosis, patients without restenosis had a lower rate of diabetes (28 vs. 61 patients, P=0.001), a significantly short period between two coronary angiographies (9.8±9.3 vs. 12.9±11.6 months, respectively, P=0.02), and lower triglyceride levels (133±53 vs. 198±121 mg/dl, respectively, P=0.05). In multivariate logistic regression analysis, diabetes mellitus, stent length, preprocedural RDW, and current smoking independently predicted ISR.'] Does preprocedural red blood cell distribution width predict bare metal stent restenosis?