frozen sperm

Azoospermia and frozen sperm.

Dear Professor Winston, I am 37 years old and my partner is 33. My partner was diagnosed with obstructive azoospermia three years ago, after we both did fertility tests requested by our GP. Since then, my partner has had sperm retrieved surgically (2013) that was frozen (4 vials – 3 large & 7-8 small/medium biopsies taken; 5-8 sperm seen per

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