abdominal aorta ultrasound results

I recently had an abdominal aorta ultrasound to rule out mesenteric ischemia because of epigastric pain I have been having for 5months. A CT of my abdomen aorta showed scattered atherosclerotic calcifications.
The cardiologist called me to tell me the ultrasound was normal.
Upon reviewing a copy of the ultrasound, I noticed on the conclusion it stated for the superior mesenteric artery velocities suggest <70 percent stenosis.
It that something I should be concerned about.
Could you explain what that means exactly?
Thank you