Usually the sperms are taken from the ejaculate but in cases of azoospermia, sometime sperms are removed with the help of a needle. Various procedures such as –
PESA (Percutaneous Epididymal Sperm Aspiration)
MESA (Micro Surgical Epididymal Sperm Aspiration)
TESA (Testicular Sperm Aspiration)
TESE (Testicular Sperm Extraction)
Micro-TESE (TESE performed with the help of a microscope)