Laboratory test
Creatinine and eGFR
Other names and abbreviations: creatinine, eGFR, GFR, glomerular filtration
Assessment of kidney function. eGFR is the estimated filtration rate calculated from creatinine.
Creatinine is a product of muscle metabolism removed by the kidneys. When the kidneys work less well, its level rises and eGFR falls. The result also depends on muscle mass and diet.
Typical ranges in adults
| Parameter | Typical range | What a deviation may mean |
|---|---|---|
| Creatinine | W: 0.5–1.1 · M: 0.7–1.3 mg/dl | high: possible reduced kidney function, dehydration |
| eGFR | 90 ml/min/1.73 m² and above | 60–89: mildly reduced – assessed together with other tests |
The ranges are approximate and differ between laboratories; they also depend on age, sex and pregnancy. A result outside the range doesn't always mean illness – discuss it with a doctor.
When it is done
With hypertension, diabetes, before contrast tests, with medicines that affect the kidneys.
How to prepare
Usually no special preparation is needed. In the morning before the blood draw, it's best not to eat a heavy breakfast – ask at reception.
