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How long can sperm stay frozen

Question: I am an educator for a human sexuality class. A student asked me an interesting question that I was unsure how to answer. Given that we know sperm can survive about 72 hours in a woman's body, how is it possible to keep sperm viable by freezing them? Answer: Sperm can survive for a long time under the right circumstances. In a woman's body we think that 72 hours is approximately correct, but the data supporting this estimate is not conclusive.
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About Storing Sperm | The Sperm Bank of California

The biggest problem is someone unplugging the freezer. Sperm, which does little at C, could be cryopreserved for centuries and still safely thawed to fertilise an egg, say experts. Little surprise then, that a man was able to father a child using the 10cc he donated 21 years ago, before having radiotherapy to treat testicular cancer as a teenager. The birth was announced this week in the journal Human Reproduction. The Human Fertilisation and Embryology Authority prohibits clinics keeping sperm past the donor's 55th birthday, but nature seems to set no limit. There's no enzymatic activity, no DNA transcription and everything metabolic is switched off.
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How long can frozen sperm be stored?

At the first visit you will provide urine, blood and semen samples in our lab. For a Client Depositor account, we do a complete semen analysis on your sample to determine sperm count and motility. If your semen contains no sperm, we will not store the sample and we will reduce the fee for your visit.
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It's also used to store sperm so it can be used in someone else's treatment. Find out more about what sperm freezing involves and how long you can store your sperm for. Donated sperm usually has to be quarantined for three or six months and screened for infections before it can be used by a recipient.
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