transtubular potassium gradient

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transtubular potassium gradient

(trans″too′byŭ-lăr′) [ trans- + tubular],

TTKG

A measurement of how avidly the kidneys retain potassium. The TTKG is used clinically to determine the cause of high serum potassium levels. It is represented mathematically as the urinary potassium concentration/plasma potassium concentration, all divided by the osmolality of urine/the plasma osmolality.