Clinical utility of anion gap in deciphering acid-base disorders.
The anion gap (AG) measurement is a very useful tool in the evaluation of patients with acid-base disorders. Once metabolic acidosis is identified, AG will provide the important first step in the differential diagnosis of disorders that either increase the AG and those that leave the AG unchanged. Delta gap is the comparison between change (delta) in the AG and the change (delta) in bicarbonate (HCO(3)(-)). Delta ratio, defined as delta AG:delta HCO(3)(-) is usually 1:1 in patients with an uncomplicated high AG acidosis. A value below 1:1 suggests a combined high and normal AG acidosis. A value above 2:1 suggests a combined metabolic alkalosis and a high AG acidosis. Urine AG (unmeasured anions-unmeasured cations) is an indirect estimate of the urine NH(4)(+) excretion. It is typically negative in patients with normal AG metabolic acidosis secondary to diarrhoea. Utilisation of AG calculations helps clinicians in identifying and treating acid-base disorders.
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Department of Medicine, University of Florida College of Medicine, Jacksonville, FL 32209, USA. Pramod.reddy@jax.ufl.edu
Mooradian
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D000136:Acid-Base Equilibrium / Q000502:physiology*; D000137:Acid-Base Imbalance / Q000097:blood / Q000209:etiology* / Q000503:physiopathology; D000143:Acids / Q000009:adverse effects; D000837:Anion Exchange Resins / Q000009:adverse effects; D001659:Biliary Tract / Q000502:physiology; D002792:Cholestyramine Resin / Q000009:adverse effects; D003967:Diarrhea / Q000150:complications; D006801:Humans; D007477:Ions / Q000097:blood; D010179:Pancreas / Q000502:physiology; D010289:Parenteral Nutrition, Total / Q000009:adverse effects; D014547:Urinary Diversion / Q000009:adverse effects; D014556:Urine / Q000737:chemistry; D014883:Water-Electrolyte Imbalance / Q000097:blood / Q000209:etiology* / Q000503:physiopathology
D000143:Acids; D000837:Anion Exchange Resins; D007477:Ions; D002792:Cholestyramine Resin