The sterility the main thing with the semen is extracted from the patient and the healthy man who are done, the semen quantity, spermatozoon density, spermatozoon motion ratio and spermatozoon survival ratio are measured as concerning the respective inspection body, SPMI which is connected to the spermatozoon was detected making use of the anti- SPMI antibody, the SPMI connection quantity, SPMI connection ratio was calculated. As a result, it was understood in the SPMI connection quantity above uniformity or the inspection body group of SPMI connection ratio above uniformity that only the inspection body of patient origin is included. It is possible to diagnose the asthenospermia with the SPMI connection quantity and calculating SPMI connection ratio.
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