The assessment of glomerular function: creatinine clearance or plasma creatinine?

Area of Science:

• Nephrology
• Renal Physiology
• Clinical Chemistry

Background:

• Glomerular filtration rate (GFR) is a key indicator of kidney function.
• Assessing GFR is crucial for managing chronic kidney disease (CKD).
• Current methods for GFR estimation include creatinine clearance and plasma creatinine concentration.

Purpose of the Study:

• To compare the efficacy of plasma creatinine concentration versus creatinine clearance in detecting abnormal glomerular function.
• To evaluate the utility of these markers in monitoring changes in renal function in CKD patients.
• To provide evidence-based recommendations for routine GFR assessment in CKD.

Main Methods:

• Retrospective analysis of patient data with diagnosed chronic kidney disease.
• Comparison of diagnostic accuracy between plasma creatinine levels and creatinine clearance measurements.
• Statistical analysis to determine sensitivity and specificity for detecting renal function abnormalities.

Main Results:

• Plasma creatinine concentration demonstrated superior sensitivity and specificity in identifying abnormal glomerular function compared to creatinine clearance.
• Plasma creatinine levels were more effective in detecting subtle changes in renal function over time in CKD patients.
• Creatinine clearance showed significant limitations in accurately reflecting true GFR in this population.

Conclusions:

• Plasma creatinine concentration is a more reliable biomarker for assessing glomerular function than creatinine clearance.
• The routine use of creatinine clearance for GFR assessment in CKD patients should be reconsidered and potentially abandoned.
• Clinical practice guidelines should be updated to reflect the superiority of plasma creatinine measurements for renal function evaluation.