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Acrosomal protein SP-10 chromatographic immunoassay sperm test kit Very accurate home fertility test kit for men A positive result is shown if the sperm count is above 15 million / ml A negative result indicates the sperm count is below 15 million / ml SP-10 is a protein found in seminal plasma, the fluid that is ejaculated during sexual activity. SP-10 is a marker of sperm count, and its concentration in semen can be used to determine male fertility.