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The page below is a sample from the LabCE course Semen Analysis. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Liquefaction should be complete before viscosity is assessed.
Semen viscosity can be estimated by aspirating the sample into a wide-bore plastic disposable pipette, allowing the semen to drop by gravity and observing the length of the thread that is formed. A normal sample leaves the pipette in small drops with very little trailing thread. A semen sample that is abnormally viscous will form a thread more than 2 cm long.
A specimen that is more viscous than normal after liquefaction may have reduced sperm motility. During sexual intercourse, hyperviscosity can prevent the sperm from reaching the cervix.