Multiple choice general knowledge science & technology What does 'Rh factor' stand for? Rhesus incompatibility factor Rhabdomyolysis factor Rheims factor Rhodamine H factor Reveal answer Fill a bubble to check yourself A Correct answer Explanation Rh factor stands for Rhesus factor, named after the Rhesus monkey in which it was first discovered. It refers to a protein antigen on red blood cells that is important in blood typing and pregnancy complications.