Cost‐effective diagnosis of male oxidative stress using the nitroblue tetrazolium test: useful application for the developing world |
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Authors: | D S Amarasekara S Wijerathna C Fernando P V Udagama |
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Institution: | 1. Institute of Biochemistry, Molecular Biology and Biotechnology, University of Colombo, , Colombo, Sri Lanka;2. Department of Obstetrics & Gynecology, Faculty of Medicine, University of Colombo, , Colombo, Sri Lanka;3. Sri Lanka Institute of Information Technology, BOC merchant tower, , Colombo, Sri Lanka;4. Department of Zoology, Faculty of Science, University of Colombo, , Colombo, Sri Lanka |
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Abstract: | Seminal oxidative stress plays an important role in male factor infertility (MFI), worldwide. A study was thus undertaken for the first time to establish seminal reactive oxygen species (ROS) as a clinical marker of MFI in a cohort of Sri Lankan males. The nitro blue tetrazolium (NBT) assay for ROS estimation and modified Endtz test for detecting leucocytes were carried out on semen samples (N = 102) of subfertile males. Age‐matched individuals (N = 30) with proven past paternity served as controls. Significantly higher ROS production was evident in individuals with asthenozoospermia and unexplained infertility (Mann–Whitney U‐test, P = 0.000), than in the fertile and the other subfertile groups tested. Receiver operating characteristic plot analysis established cut‐off points of 40.57 and 42.02 μg formazan/107 spermatozoa for ROS to distinguish fertile males from asthenozoospermics (71.4% sensitivity: 70% specificity; AUC = 0.82), and from unexplained infertile males (74.1 % sensitivity: 73.3% specificity; AUC = 0.85) respectively. As ROS appear to be a potential marker of male infertility, it is imperative to validate this test as a simple, cost‐effective hence a widely accessible diagnostic tool to be included in MFI investigations in the developing world. |
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Keywords: | Asthenozoospermia male factor infertility oxidative stress reactive oxygen species unexplained infertility |
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