Star Lotolelei is one of the top-rated draft prospects. (Rick Bowmer / AP)

Star Lotulelei, the former Utah defensive tackle who is regarded as a top prospect in April’s NFL draft, will not be allowed to work out at the scouting combine because a physical revealed an abnormal test result.

An echocardiogram, ESPN reports, revealed a heart condition that requires further tests and his agent, Bruce Tollner, told ESPN’s Joe Schad that Lotulelei would see a specialist this week. During his physical, it was discovered that Lotulelei’s left ventricle was pumping at only 44 percent efficiency, with the normal range 55-70 percent. USA Today reported that Lotulelei has been told he can work out on his own until he is examined, with the hope that perhaps he is merely suffering from dehydration from dropping weight before the combine.

Lotulelei, who is 6-2 and weighs 311 pounds, expects to take part in Utah’s Pro Day on March 20. He has been rated as a top-five prospect by ESPN’s Mel Kiper Jr. and Todd McShay.

A year ago, Carolina Panthers defensive end Frank Alexander was pulled from combine drills because of an abnormal test, then cleared by specialists.

Follow @CindyBoren on Twitter and on Facebook.