A semen analysis provides important information on the quality of sperm. It is usually repeated after eight  weeks if the quality is (and repeated immediately if no sperm is present). Ideally, the best sample is obtained between two and five days of Further male investigations are required if the sperm concentration is below 6 million/ml. Such tests include screening for a hormonal imbalance, genetic tests and testicular ultrasound scan.

DNA fragmentation test is currently self-funded and not supported by the NHS. It may provide further information in cases of recurrent miscarriage and poor embryo development during IVF.