A creatinine level chart measures the levels of waste product, or creatinine, in the blood or urine to help determine how well the kidneys are working. Men generally have higher creatinine levels than women.
Creatinine levels are partially dependent on the amount of muscle tissue present in the body, according to Web.MD.com. Normal levels of creatinine are approximately 0.6 to 1.2 milligrams per deciliter in adult males and 0.5 to 1.1 in adult females.
Generally a high serum level of creatinine can mean that the kidneys are stressed and not working well, as noted by the MayoClinic.org. It can indicate temporary dehydration or a low blood volume, or it may occur after eating a large meal or taking certain medications. A doctor may follow-up with a urine test or an additional blood test in order to confirm the results when a serum level of creatinine is higher than normal.