If it was a physical, this is now done usually on the internet on a
web portal run by the practice. Also know that creatine, or creatinine, doesn't just test the kidneys, it's also a test of muscle problems and inflammation. In the doc's report there will be a range. If you want to know the general range, I will tell you that info isn't consensus. Most don't think it's a problem unless it's very high, whereas others react when it's just out of range.