Creatinine is a waste product that is produced continuously during normal muscle breakdown. The kidneys filter creatinine from the blood into the urine, and it is then eliminated from the body. Because muscle tissue is fairly constant in the body, the production of creatinine tends to be relatively stable on a daily basis.

Elevated blood creatinine levels can indicate impaired kidney function or kidney disease. It can also be temporarily increased by a high meat diet, certain medications, and heavy exercise.

Low levels are less common and are usually not a concern, but they can be associated with conditions that result in decreased muscle mass.

Creatinine

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