Renal clearance ratio

The renal clearance ratio or fractional excretion is a relative measure of the speed at which a constituent of urine passes through the kidneys.[1][2] It is defined by following equation:

Diagram showing the basic physiologic mechanisms of the kidney

Creatinine is sometimes used instead of inulin as the reference substance.

See also


  1. Rudolfs K. Zalups; Lawrence H. Lash (1996). Methods in Renal Toxicology. CRC Press. pp. 2–3. ISBN 978-1-4398-0560-2.
  2. Khurana (2005). Textbook Of Medical Physiology. Elsevier India. pp. 561–2. ISBN 978-81-8147-850-4.
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