Jan. 18, 2023 – Only about 4% of men who signed up to be sperm donors in the United States or Denmark completed the process and had their sperm frozen for use in medically assisted reproduction, new research reveals. 

Some men apply online, have their sperm tested, but do not go any further in the process. Others are rejected because of low thawed sperm quality, a self-reported health condition, or from failure to pass an infectious disease test or genetic screening. 

These low figures should not discourage men who wish to become sperm donors, says Allan Pacey, PhD, lead author of the…


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