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Anion Gap

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  1. Definition
    1. Difference between calculated serum anions and cations
  2. Calculation
    1. AG = Serum Sodium - Serum Chloride - Serum Bicarbonate
  3. Interpretation
    1. Normal Anion Gap: 12 +/- 2 meq/L
  4. Causes: Low Anion Gap
    1. Paraproteinemia (Multiple Myeloma)
    2. Spurious Hyperchloremia (Bromide toxicity)
    3. Hyponatremia
    4. Hypermagnesemia
    5. Hypoalbuminemia
      1. Anion gap decreases 2.5 meq per 1 g/dl Albumin drop
  5. Causes: High Anion Gap
    1. Metabolic Acidosis (without increased Serum Chloride)
  6. References
    1. Bakerman (1984) ABCs of Lab Data, ILD, Greenville, NC
    2. Ghosh (2000) Fed Pract p. 23-33

Anion Gap (C0003074)

ConceptsClinical Attribute (T201)
MSHD000136
EnglishAG - Anion gap, Anion Gap, Anion Gaps
Spanishanion gap, anion restante, brecha anionica, hiato anionico, intervalo anionico
Parent ConceptsMetabolism (C0025519)
SourcesLNC, MSH, MTH, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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