Transtubular Potassium Gradient TTKG

Order: serum K and osmolality, urine K and urine osmolality

Formula: Uk/Pk / Uosm/Posm

Normal levels should be 8-9

In hyperkalemia, should be >10, if low <7 indicates mineralocorticoid deficiency

In hypokalemia, should be <3, if higher means renal K loss.

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