HHH: Hog Ear is right. You most likely had a creatinine test, not a creatine test. And it does matter how high it is, as it is used as a marker for kidney function in laboratory medicine.
Creatinine is a normal waste product of metabolism which is cleared by the kidneys. When there is a build-up of creatinine in the blood, it is usually one of two things: dehydration (which will concentrate everything in your blood) or some inability of the kidneys to clear the waste in a timely manner.
I have my own opinion about doctors who say “this is really high” without qualifying further. You are paying this guy to be able to explain the answer to your health questions, and he can’t even tell you what the creatinine level signifies? There is a big difference between a “really high” for a normal person, and a clinically significant “really high” for someone with a possible kidney malfunction or other underlying disease.
Call that doctor, get the exact number. Have him explain the significance of the impact it has on your health. Chances are (99%), it’s not a big deal at all. If he can’t explain it, tell us the number and I will be happy to explain it for you myself.