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New technique 80% effective in selecting a baby's gender

It's a controversial notion, but couples undergoing fertility treatments may soon be able to select the sex of their baby—with an 80% chance of success, doctors say.

Sperm-sorting techniques have been tried and offered before, but the new procedure—which separates sperm cells based on weight—appears much more accurate and safe, according to a new study published in PLOS ONE.

In the study, more than 1,300 couples underwent a sperm-sorting technique that uses a specific multilayer density gradient, or medium, to allow particles of different sizes to separate themselves based on weight.

We let sperm swim into the dense medium," he said. "It's a very simple concept; the lighter sperm rise to the top while the heavier sperm go toward the bottom."

Next, researchers select a sperm and inject it into the center of the egg. This is a procedure known as intracytoplasmic sperm injection (ICSI). The embryo undergoes preimplantation genetic testing to screen for chromosomal abnormalities or sex.

In the study group, "the sperm moved well, and the sorting technique didn't impair sperm in any shape or form," said Palermo. "The health of the children is fine so far, and that is all reassuring." No developmental delays were seen at 3 years of age.


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