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New Test Reveals Good vs. Bad Sperm,  June 2, 2010
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A simple laboratory test can separate healthy, functional sperm cells from sperm with damaged DNA with 99 percent accuracy, according to new research.

The test uses a chemical found in the membrane of human egg cells to sort functional from non-functional sperm. It has already been approved for use in in-vitro fertilization by the Food and Drug Administration and can raise the chances of a successful pregnancy by 20 to 30 percent, according to lead developer Gabor Huszar, a senior researcher in the Department of Obstetrics, Gynecology, and Reproductive Sciences at Yale Medical School.

Traditional male fertility tests focus on sperm count (how many sperm are present) and how mobile they are. In natural fertilization, Huszar said, both the sperm and egg develop structures on their surfaces called receptors that are necessary for successful bonding.

"The sperm and the egg choose each other," he said.
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