Without comment, the nation's high court declined to accept Oklahoma's appeal.
It was the second time this month that the U.S. Supreme Court rejected an appeal from the state on an abortion case after showing some interest in the law being disputed. Last week, the high court declined to review a law regarding drug-induced abortions.
That law had also been struck down by the Oklahoma Supreme Court.
The ultrasound law would have required a physician to perform an ultrasound test using either a vaginal probe or an abdominal transducer and explain to the woman what the ultrasound was depicting.