Oxidative stress (OS) has been reported to be associated with the pathogenesis of polycystic ovary syndrome (PCOS). Ischemia-modified albumin (IMA) levels in the circulation have been recently studied as a novel marker of OS. The studies in the literature on IMA levels in PCOS are inconsistent. This meta-analysis was conducted to compare circulatory IMA levels between PCOS patients and non-PCOS controls. Relevant studies were retrieved by online database and manual searching. The standardized mean differences (SMDs) with 95% confidence intervals (CIs) were obtained by a random-effects meta-analysis. The funnel plot analysis with Begg's and Egger's tests was used for publication bias. A total of nine studies were included in this meta-analysis. The results indicated that the serum IMA levels were significantly elevated in PCOS patients as compared to non-PCOS controls (SMD = 0.49, 95% CI = 0.23-0.75, Z = 3.75, p = .0002). A one-study leave-out sensitivity analysis indicated that no single study had a significant influence on the overall outcome, suggesting the good validity and stability of these meta-analytic results. There was no evidence of publication bias as evidenced by the Egger (p = .28) and Begg's tests (p = .21). The present meta-analysis suggests that IMA might be considered as a reliable and novel marker reflecting increased OS in PCOS.
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