What does a platelet count of 652 mean?

Family practice : Your platelet count is a little elevated. It isn't high enough to be concerned. Check with your dr if he wants to follow levels.

?thousand?: Platelet counts are usually given as hundreds of thousands per ml of blood. As a means of shorthand communication, they may be stated without the zeros, so "652" likely means 652, 000. This is somewhat high, and might merit investigation but your doctor will know best the circumstances in which this may fit. If it is really only 652, that is dangerously low, and you need to be in a hospital asap.