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[Estimation of glomerular filtration rate using weight/creatinine formula]
Gema Fernández-Fresnedo1, Angel Luis Martín de Francisco, Emilio Rodrigo Calabia
1Servicio de Nefrología. Hospital Universitario Valdecilla. Santander. España. neffg@humv.es
Medicina Clinica
|April 30, 2003
Summary
The weight/creatinine formula offers a useful, albeit imperfect, estimation of glomerular filtration rate (GFR) in clinical practice, particularly for older adults with elevated creatinine levels. This simple method aids in early chronic kidney disease diagnosis.
Area of Science:
- Nephrology
- Clinical Chemistry
Context:
- Accurate assessment of renal function is crucial for managing chronic kidney disease (CKD).
- Early diagnosis of CKD is essential for effective patient management.
- Serum creatinine is a common but sometimes insufficient marker for renal function.
Purpose:
- To evaluate the clinical utility of the weight/creatinine formula for estimating glomerular filtration.
- To assess the accuracy of this indirect measurement in daily practice.
Summary:
- A study of 1,025 patients compared creatinine clearance with the weight/creatinine formula.
- Good correlation was found for creatinine levels between 1.5-3 mg/dl, especially in patients over 60.
- The formula showed 91% sensitivity and 80% specificity for detecting GFR below 50 ml/min.
Impact:
- The weight/creatinine formula provides a clinically relevant estimation of GFR, especially in specific patient subgroups.
- This simple method can help prevent diagnostic errors associated with relying solely on serum creatinine.
- Facilitates earlier detection and management of chronic renal disease.