How are those muscles doing today? We all know that as the years go by, our bodies go through changes. Some are super obvious, others... not so much. And there's one change in particular that often ...

Average creatinine levels can vary depending on a person’s age, sex, and muscle mass. However, average ranges are 0.7 to 1.2 milligrams per deciliter (mg/dL) for males and 0.5 to 1.0 for females.