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Updated: Aug 12, 2026

Sperm Collection of Differential Quality Using Density Gradient Centrifugation
Published on: November 29, 2018
Semen characteristics of 49 fertile males
C L Barratt1, B C Dunphy, E J Thomas
1Department of Obstetrics and Gynaecology, University of Sheffield, Jessop Hospital for Women, U.K.
Abstract:
We examined the semen characteristics of 49 men whose partners had conceived within the last 16 weeks. There was considerable variation in the semen results. The % of morphologically ideal forms and the absence of sperm bound antibodies appeared to be the two most important semen characteristics when assessing the fertilising potential of the samples. A large proportion of samples (70%) when compared to the WHO standards of normality, were classed abnormal, however, only 25% of the samples had greater than 2 abnormal characteristics. It is diagnostically more relevant to determine the number of abnormalities within a sample rather than categorising the sample as "normal" or "abnormal".
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