The normal range of creatinine in the blood varies depending on age, sex, and muscle mass. However, generally accepted ranges are:
- Adult Males: 0.7 to 1.3 milligrams per deciliter (mg/dL) or 61.9 to 114.9 µmol/L (micromoles per liter). Several sources provide slightly different ranges within this approximate area, such as 0.74 to 1.35 mg/dL (65.4 to 119.3 µmol/L) Mayo Clinic.
- Adult Females: 0.6 to 1.1 mg/dL or 53 to 97.2 µmol/L. Again, slight variations exist, with some sources indicating a range of 0.59 to 1.04 mg/dL (52.2 to 91.9 µmol/L) Mayo Clinic.
It's crucial to understand that these are approximate ranges. Individual laboratories may have slightly different reference intervals. Additionally, factors such as race can also cause minor variations. Always consult the specific reference range provided by the laboratory that performed the test. Lower values can be seen in individuals with less muscle mass, such as the elderly. For example, some sources suggest ranges of 0.6-1.2 mg/dL (53-106 μmol/L) for men and lower values in elderly individuals Medscape. Children also typically have lower creatinine levels than adults.
Remember that creatinine is a waste product of muscle metabolism. Therefore, higher muscle mass generally correlates with higher creatinine levels.
