Parameters Affecting Creatinine 24-Hour Urine Renal Clearance
| Patient size | Renal size | Renal blood flow | Blood volume | EE | Creatinine production | Creatinine bld conc | Creatinine excreted | BSA correction |
| Average | – | – | – | – | – | – | – | Yes |
| Small | ↓ | ↓ | ↓ | – | ↓ | – | ↓ | Yes |
| Large | ↑ | ↑ | ↑ | – | ↑ | – | ↑ | Yes |
EE = extraction efficiency; bld conc = blood concentration; – = average or unchanged; ↓ = decreased; ↑ = increased.