"Prior to the date of semen sample collection[, the patients were advised abstinence of 4 days. Semen was collected by masturbation in a sterile glass container. Specimens were analysed by a trained technician within 60 minutes of their collection. "Volume" was measured to the nearest millimetre in a calibrated chamber. "

"In conclusion, we state that sperm motility and morphology are changing parameters and their relative levels depend on the existing sperm count in an individual. Physiological variants do exist within subjects and a Structure-function relationship has also been put forth to effectively deal with semen parameter variables. "
Data:
http://www.jpgmonline.com/article.asp?issn=0022-3859;year=1996;volume=42;issue=4;spage=93;epage=6;aulast=Dua