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Table 4 Calculation of transtubular gradient

From: Systemic lupus erythematosus associated with type 4 renal tubular acidosis: a case report and review of the literature

Urine sodium, 59 mM/l Transtubular gradient
Urine potassium, 38 mM/l Urine K/plasma K
Urine osmolality, 405 mOsm/kg Urine osmolality/plasma osmolality
Plasma potassium, 5.1 mM/l  
Plasma osmolality, 288 mOsm/kg Patient's transtubular gradient = 5.3