摘要: Summary’The hypo-osmotic swelling test (HOST) score when< 50% is associated with very poor pregnancy rates (PR5) associated with implantation failure, not failed fertilization. The study presented here evaluated whether a large discrepancy between the viability test (which measures structural integrity of the sperm membrane) and HOST score (which measures functional integrity of the sperm membrane) may also predict the presence of the toxic factor that causes embryo implantation disorders. The relative discrepancies were divided into four quartiles. There were no differences in clinical or viable PR5 or implantation rates according to percentile. Thus, these data do not support the hypothesis that the relative discrepancy between HOST scores and viability is related to IVF outcome.