A member asked:

What shuld be the normal motility of the sperm to fertilize the egg?

3 doctors weighed in across 2 answers

Swim straight: Most sperm are classified as having a motility score of 0 to 4. Forward progression, swimming straight, is classified on a scale based on their speed and ability to swim forward or straight. 2+ or above is considered 'normal' on this scale.

Answered 9/25/2012

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Depends: Who 1999 who 2010 progressive motility 50% 32% please contact a reproductive endocrinologist or urologist as to how these values may apply to you and infertility. As you can see the values change over the years, and require interpretation.

Answered 1/4/2013

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