Male-factor issues can elevate the risk of recurrent pregnancy loss or recurrent unexplained IVF failure. These may include previously unrecognized genetic abnormalities in the father or elevated levels sperm DNA damage. If a woman's evaluation results are normal, testing of the male partner is appropriate. Studies have shown that interventions can be taken to effectively improve sperm quality for most men, and potentially increase the chances of a positive fertility outcome for the couple. Interventions available are often a combination of lifestyle changes and medical or surgical interventions.