The hemizona assay (HZA): development of a diagnostic test for the binding of human spermatozoa to the human hemizona pellucida to predict fertilization potential**Supported in part by a research grant from Serono Laboratories, Inc., Randolph, Massachusetts.††Presented in part at the Fifth World Congress on In Vitro Fertilization and Embryo Transfer, Norfolk, Virginia, April 5 to 10, 1987, and at the Forty-Third Annual Meeting of The American Fertility Society, Reno, Nevada, September 26 to 30, 1987.‡‡Material presented herein are opinions of the authors and do not represent the opinion of the Department of Defense or the Department of the Navy.§The Jones Institute for Reproductive Medicine, Department of Obstetrics and Gynecology, Eastern Virginia Medical School.