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| ==Background==
| | #REDIRECT[[Anion gap]] |
| *< 7 meq/L
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| ==DDX==
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| *Lab error
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| *Decreased "unmeasured" anions
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| **hypoalbuminemia
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| *Increased "unmeasured" cations
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| **hyperkalemia
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| **hypercalcemia
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| **hypermagnesemia
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| **lithium intoxication
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| *Increased cationic paraprotein
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| **multiple myeloma
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| **polyclonal IgG gammopathy
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| *Pseudo
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| **Severe hypernatremia (>170 meq/L)
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| ***True conc of Na is underestimated
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| **Marked hyperlipidemia
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| ***Leads to overestimation of plasma Cl conc)
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| **Bromide intoxication (e.g. for myasthenia gravis and some herbal medications)
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| ***Machine mistakenly reads Br as Cl
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| *AG falls by 2.5 meq/L for every 1 g/dL reduction in albumin concentration
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| ==Source==
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| Kaji Questions
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| [[Category:FEN]] | |
| [[Category:Tox]]
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