Sperm production is severely impaired or absent within the testes due to intrinsic testicular failure, genetic abnormalities (like Klinefelter syndrome), or prior gonadotoxic treatments (such as chemotherapy). Surgical Sperm Retrieval Techniques
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Sperm retrieved via medical extraction techniques is immature compared to ejaculated sperm. It lacks the mobility required to swim through the female reproductive tract and penetrate an egg naturally.