Introduction: There are several studies on the relationship between increased mean platelet volume (MPV) and varicocele. �e inves� �e inves� tigated the relationship between preoperative and 6�month post� operative MPV values in patients whose varicocele was corrected with surgery. Methods: A total of 282 patients underwent surgery at our urology clinic between December 2011 and December 2013 for primary varicocele. �e retrospectively examined the records of 61 patients who came to the 6�month postoperative follow�up. The preop� erative varicocele diagnosis was made with physical examination findings and supported with colour Doppler ultrasonography. Results: The varicocele was grade I in 12 patients, grade II in 34 patients and grade III in 11 patients. �hen the preoperative and 6�month postoperative haemoglobin (Hb), MPV, mean corpuscular volume, platelet, and platelet distribution width (PD�) values were compared, there was a significant decrease in MPV (p = 0.019), and a significant increase in Hb (p < 0.001). A noticeable increase was also present in PD�, but it was not statistically significant (p = 0.058). Conclusion: �e found that MPV increased in patients with varic� ocele and tended to decrease again after the varicocele was sur� gically corrected. However, we feel larger prospective series are needed.