Related Experiment Videos
Endogenous creatinine clearance as a clinical measure of glomerular filtration rate
Insights
Creatinine clearance accurately measures glomerular filtration rate but may overestimate it at lower levels. Glomerular filtration rate naturally varies, a factor to consider in clinical practice.
Area of Science:
- Nephrology
- Renal Physiology
Background:
- Glomerular filtration rate (GFR) is a key indicator of kidney function.
- Accurate GFR measurement is crucial for diagnosing and managing kidney disease.
Purpose of the Study:
- To evaluate the accuracy of endogenous creatinine clearance as a measure of GFR.
- To compare creatinine clearance with inulin clearance in a clinical setting.
Main Methods:
- Simultaneous measurement of creatinine clearance and inulin clearance in 41 patients.
- 91 paired studies were conducted to assess GFR.
Main Results:
- Endogenous creatinine clearance demonstrated accuracy in measuring GFR.
- A slight overestimation of GFR by creatinine clearance was observed at filtration rates below 20 ml/min.
- Successive GFR determinations showed variability up to 20% between methods, despite agreement.
Conclusions:
- Creatinine clearance is a reliable indicator of GFR.
- Clinical use of GFR measurements should account for inherent variability and potential overestimation at low filtration rates.
Abstract:
Endogenous creatinine clearance was assessed by inulin in 91 simultaneous studies in 41 patients and proved an accurate measurement of glomerular filtration rate. For filtration rates <20 ml/min the creatinine clearance may slightly overestimate the glomerular filtration rate. Successive determinations of filtration rate by either method may vary by 20% even though the methods agree with each other. Glomerular filtration rate itself is variable, and in its clinical usage this should be recognized.