* Oedematous or have ascites
Estimate "Dry" Body Weight (DBW = Total Body Weight – Weight due to accumulated fluid).
** In Acute Renal Failure
If Serum Creatinine vary more than 20 µmol/L (or 0.23 mg/dL) in 24 hours, the Serum Creatinine value will not reflect the true clearence rate and measure of renal function will be inaccurate.