Semen Analysis

Has anyone's significant other had a semen analysis? We just received my husband's results and everything is within the normal range with the exception of morphology. He had 4% "normal forms" and 96%  "head defects". Is this something to be concerned about? Prior to getting the paper results in the mail my doctor told me everything came back normal, but seeing the numbers makes me worried. Any insight would be so appreciated. Thank you!