Final answer:
The viability test assesses the proportion of living sperm to determine their ability to potentially fertilize an egg.
Explanation:
Viability test is used to determine the proportion of living sperm. It assesses the sperm's ability to survive and potentially fertilize an egg. One method, the swim-up technique, helps gauge the quality of sperm by allowing the healthiest sperm to swim up to a culture medium, leaving behind debris and aiding in selecting optimal sperm for fertilization procedures such as in vitro fertilization.
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