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Journal of Andrology, Vol 11, Issue 5 446-452, Copyright © 1990 by The American Society of Andrology

JOURNAL ARTICLE

Relationship between morphology and motion characteristics of human spermatozoa in semen and in the swim-up sperm fractions

S. Oehninger, R. Acosta, M. Morshedi, C. Philput, R. J. Swanson and A. A. Acosta
Jones Institute for Reproductive Medicine, Department of Obstetrics and Gynecology, Norfolk, VA 23507.

In this study, the authors evaluated the morphology pattern and motion characteristics of human spermatozoa before and after swim-up separation. Samples were divided into two, morphologically different groups according to the percentage of normal sperm forms assessed by the strict criteria of the Norfolk laboratory: "good"(G) and "poor" (P) prognosis patterns. The percentages of normal forms, slightly abnormal forms, and severe head defects were significantly different in the two groups. Motile characteristics were analyzed by a computerized semen analyzer with constant parameter settings. Before swim-up there were no significant differences in semen volume, percentage of neck and tail defects, concentration, or percentage of motility and linearity, but the mean velocity was higher in group G. After swim-up the percentage of motility, total number of motile cells, and recovery rate were higher for group G, and the incidence of severe head defects correlated negatively with the percentage of cells with a velocity of greater than 80 microns/sec. The results suggest that patients with a high incidence of sperm head defects have impaired original velocity, and swim-up selects for velocity as well as normal forms and motility. Although motility and velocity improved substantially after swim-up, the recovery rate and percentage of motility were significantly lower in the P group.


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Copyright © 1990 by The American Society of Andrology.