Kidney Function
What is Creatinine? Optimal Ranges & Function
Normal Range:0.7-1.3 mg/dL
Optimal Range:0.8-1.1 mg/dL
What is Creatinine?
Creatinine is a waste product from normal muscle metabolism. Your kidneys filter it from your blood, so creatinine levels reflect kidney function.
Why Creatinine Matters
Elevated creatinine may indicate impaired kidney function. It's also used to calculate your GFR (estimated glomerular filtration rate), a key measure of kidney health.
Symptoms of Low Creatinine
- Usually not concerning
- May indicate low muscle mass
- Could suggest malnutrition
Symptoms of High Creatinine
- Fatigue
- Swelling in legs or feet
- Decreased urination
- Nausea
- Shortness of breath
Reference Ranges
0.7 mg/dL1.3 mg/dL
0.8
1.1
Standard Lab Range
BioStack Optimal
| Range Type | Minimum | Maximum | Unit |
|---|---|---|---|
| Normal Range | 0.7 | 1.3 | mg/dL |
| Optimal Range | 0.8 | 1.1 | mg/dL |
Related Biomarkers
When to Request Additional Tests
If Your Creatinine is High
When Creatinine is elevated, consider testing the following markers to get a more complete picture:
- Cystatin C — More accurate kidney function estimate