The glomerular filtration rate (GFR) shows how much urine is produced in the kidneys per unit of time and is usually expressed in ml/min. This is a very important indicator, as it can be used to assess the ability of the kidneys to perform their main function of purifying plasma and forming urine. GFR is a very sensitive indicator, in case of kidney diseases, it usually changes faster than urea, creatinine, ammonia, etc.
| Stages of chronic kidney disease (CKD) | ||
|---|---|---|
| Stage | GFR ml/min/ 1.73 m2 | Feature |
| I | GFR ≥ 90 ml/min/ 1.73 m2 | Kidney damage with normal or elevated GFR |
| II | GFR 60-89 ml/min/ 1.73 m2 | Kidney damage with a slight decrease of GF |
| III | GFR 30-59 ml/min/ 1.73 m2 | Moderate decrease in GFR |
| IV | GFR 15-29 ml/min/ 1.73 m2 | Severe reduction |
| V | GFR ≤ 15 ml/min/ 1.73 m2 | Kidney failure |
