ABSTRACT:Efforts were made to disrupt and solubilize human sperm cells and to evaluate the product for its content of infertility antibody‐related antigens. In the procedure that was developed, a well‐washed sperm sample is treated with 0.1 M dithiothreitol for 60 min, followed by trypsin at 0.1 mg/ml for 30 min, and then by soybean trypsin inhibitor. A mixture of DNAses I and II are added. After centrifuging, the resuspended pellet (RP) and the final supernatant (FS) show several degrees of cellular breakdown. Immunological evaluation was done with a strongly positive human serum containing sperm‐head antibody. From the inhibition of sperm agglutination, we could conclude that the desired soluble antigen was obtained in the FS fra