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It is done to help evaluate male fertility , whether for those seeking pregnancy or verifying the success of vasectomy. A normal sample leaves the pipette in small discrete drops. It is also commonly used for testing human donors for sperm donation , and for animals semen analysis is commonly used in stud farming and farm animal breeding. Langman's medical embryology 11th ed. Computer assisted semen analysis CASA is a catch-all phrase for automatic or semi-automatic semen analysis techniques. To provide a correct result it is necessary to perform at least two, preferably three, separate seminal analyses with an interval between them of 7 days to 3 months. For this reason, they are believed to give more accurate results when used for semen analysis.

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Mosby's Manual of Diagnostic and Laboratory Tests, 5e 5 ed.

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Men who are infected [16] with the human immunodeficiency virus HIV produce lower semen volume. Examples of parameters measured in a semen analysis are: sperm count, motility, morphology, volume, fructose level and pH. A man may prefer to produce his sample at home rather than at the clinic.

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