Abstract
Introduction: Glomerular filtration rate (GFR) is used as a measure of overall renal function. Creatinine clearance (CrCl) based estimation of GFR requires a 24-hour collection of urine which is cumbersome and time consuming. Instead, Schwartz formula is used for the estimation of GFR based on calculations. It is an estimate of GFR (eGFR) in children, derived from body length (L, in cm), serum creatinine (Scr, in mg/dL) and a constant (k = 0.55): GFR = (0.55 × L) /Scr. However, it is important to cross validate this equation before using it in Sri Lankan children. Objective: To cross validate the use of Schwartz formula against CrCl, in a paediatric population in determining the glomerular function. Method: A cross-sectional descriptive study was carried out at Lady Ridgeway Hospital for Children, Colombo, Sri Lanka. Forty seven children with chronic kidney disease from medical wards and nephrology clinic and 26 healthy children, between the ages of 3-12 years were recruited. In these patients GFR was determined using CrCl and calculated GFR by Schwartz formula using serum creatinine measure. The CrCl values were compared against eGFR derived from Schwartz formula. Correlation and limits of agreement between the two methods were evaluated. Results: Although a weak but statistically significant correlation (r = 0.476, P Conclusions : A weak but statistically significant correlation was seen between eGFR based on CrCl and eGFR derived from Schwartz formula. (Key words: Glomerular function, glomerular filtration rate, serum creatinine, creatinine clearance, Schwartz formula) Sri Lanka Journal of Child Health , 2017; 46 (2): 155-159
Highlights
Glomerular filtration rate (GFR) is used as a measure of overall renal function
Results: a weak but statistically significant correlation (r = 0.476, P
A weak but statistically significant correlation was seen between estimate of GFR (eGFR) based on CrCl and eGFR derived from Schwartz formula
Summary
Glomerular filtration rate (GFR) is used as a measure of overall renal function. Creatinine clearance (CrCl) based estimation of GFR requires a 24-hour collection of urine which is cumbersome and time consuming. Glomerular filtration rate (GFR) is a measure of the overall renal function in health and disease[1]. Creatinine clearance (CrCl) based estimations of GFR are commonly used due to their practicability in day to day clinical practice They require a 24hour urine collection which is cumbersome and time consuming both for the patient and the staff. Efforts have been made to improve rapid estimation of GFR for children using equations, without a 24hour urine collection One such equation is the Schwartz formula, based on a mathematical relationship between serum creatinine (Scr) and GFR.
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