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Linear regression analysis of urine electrolyte-to-creatinine ratios and levels of serum electrolytes. a Urine sodium-to-creatinine ratio (mmol/mmol) plotted against serum sodium (mmol/L) levels among 128 patients with normal renal function. b Urine potassium-to-creatinine ratio (mmol/mmol) plotted against serum potassium (mmol/L) levels among 128 patients with normal renal function
