Renal clearance ratio

Diagram showing the basic physiologic mechanisms of the kidney

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

clearance\ ratio\ of\ X = \frac{C_x}{C_{in}}

X is the analyte substance
C_x is the renal plasma clearance of X
C_in is the renal plasma clearance of inulin.

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

Secretion	clearance Pharmacokinetics Clearance of medications Urine flow rate

Reabsorption	Solvent drag sodium chloride urea glucose oligopeptides protein

Renal function	Glomerular filtration rate Creatinine clearance Renal clearance ratio Urea reduction ratio Kt/V Standardized Kt/V Measures of dialysis Hemodialysis product PAH clearance (Effective renal plasma flow Extraction ratio)

Filtration	Renal blood flow Ultrafiltration Countercurrent exchange Filtration fraction

Hormones

Acid-base balance

Body water: Intracellular fluid/Cytosol

Buffering

Other

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Renal clearance ratio

See also