Originally Posted by serenade

Well, success on the mcat = usually correlated with success on boards = success in getting a D.O = success in being allowed to practice medicine. So yah, generally your mcat score or even USMLE may not be predictive of how good a doctor you'll be, but a low mcat score will be a decent predictor of performance in medical school and the boards and statistically the drop out rate for lower mcat score is high.