Renal clearance ratio

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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:

• 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.

[edit] See also

• Kt/V

v • d • e Urinary system, physiology: renal physiology and acid base physiology Filtration Renal blood flow - Ultrafiltration - Countercurrent exchange Hormones affecting filtration Antidiuretic hormone (ADH) - Aldosterone - Atrial natriuretic peptide Secretion/clearance Pharmacokinetics - Clearance of medications Reabsorption Solvent drag -Na+ - Cl- -urea -glucose -oligopeptides -protein Endocrine Renin - Erythropoietin (EPO) - Calcitriol (Active vitamin D) - Prostaglandins Assessing Renal function / Measures of dialysis Glomerular filtration rate - Creatinine clearance - Renal clearance ratio - Urea reduction ratio - Kt/V - Standardized Kt/V - Hemodialysis product - PAH clearance (Effective renal plasma flow - Extraction ratio) Acid base physiology Fluid balance - Darrow Yannet diagram - Body water - Interstitial fluid - Extracellular fluid - Intracellular fluid/Cytosol - Plasma - Transcellular fluid - Base excess - Davenport diagram - Anion gap - Arterial blood gas Buffering/compensation Bicarbonate buffering system - Respiratory compensation - Renal compensation