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Arch Androl. 1992 Jan-Feb;28(1):15-7.

Evaluation of sperm morphology using Kruger's strict criteria.

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Department of Obstetrics and Gynecology, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School of Camden, Cooper Hospital/University Medical Center.


Prospective and retrospective studies were conducted to evaluate sperm morphology using strict criteria for predicting fertilization capacity in males. Severely impaired male fertility potential was measured by a result of less than or equal to 4% (denotes percentage sperm having normal morphology) and scores of greater than 14% indicated normal fertilization potential. There were no statistically significant differences found in pregnancy rates in partners of men with normal morphology of less than or equal to 4% vs. those with 14% or greater (chi 2 analysis): the prospective study showed a 41% pregnancy rate in less than or equal to 4% group vs. 29% rate in greater than 14% group (p = 0.44 NS); the retrospective analysis showed a 50% pregnancy rate in the group with less than or equal to 4% morphology scores vs. 67% in greater than 14% group (p = 0.45 NS). When only the men with normal motile density (greater than 10 x 10(6)/ml) were evaluated, a statistical difference was found in the retrospective study between the group with morphology results greater than 14% (93%) vs. the group less than or equal to 4% (40%). However, the 56% success rate in the men with less than 10 x 10(6)/ml sperm and normal morphology less than or equal to 4% reduces the significance of the diagnosis of sperm morphology using the new strict criteria.

[Indexed for MEDLINE]

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