The Renal Excretion of Potassium.

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Abstract
During osmotic diuresis in the dog, K clearances greater than the simultaneously detd. filtration rates were observed (creatinine and/or thiosulfate clearance). Urea was used as the diuretic agent, and its clearance never exceeded the filtration rate. K clearance/creatinine clearance ratios over unity were also observed after infusing KC1 with urea and with NaHCO3. The excretion of more K than was apparently filtered at the glomerulus was considered as evidence that the renal tubules secreted K, but no evidence was obtained regarding the relative magnitude of the secretory process.

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