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Testicular Sperm Aspiration (TESA)
A needle biopsy of the testicle used to obtain small amounts of sperm. A small incision is made in the scrotal skin and a spring-loaded needle is fired through the testicle. Usually does not result in enough sperm to freeze for later use. Craft has met with high success rate using TESA.
Percutaneous Epididymal sperm aspiration (PESA)
This method is used to determine sperm count in case of a possible blockage of the vas deferens. A small needle is inserted through the skin of the scrotum to collect sperm from the epididymis, where sperm are usually stored after production in the testes. It can also be used to extract sperm for intracytoplasmic sperm injection (ICSI).