Internal Medicine · ICU and Critical Care

Anion Gap (with potassium) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Sodium (mmol/L)

mmol/L

Allowed range: 100–180 mmol/L

Chloride (mmol/L)

mmol/L

Allowed range: 70–130 mmol/L

Bicarbonate (mmol/L)

mmol/L

Allowed range: 5–45 mmol/L

Potassium (mmol/L)

mmol/L

Allowed range: 2–8 mmol/L

Result

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Clinical inputs

Sodium (mmol/L)Accepted range: 100 to 180
Chloride (mmol/L)Accepted range: 70 to 130
Bicarbonate (mmol/L)Accepted range: 5 to 45
Potassium (mmol/L)Accepted range: 2 to 8

Primary source

Kraut JA, Madias NE. Serum anion gap: its uses and limitations in clinical medicine. Clin J Am Soc Nephrol. DOI: 10.2215/CJN.03020906. PMID: 17267600. Scope: Anion gap with potassium (mEq/L) = (Na + K) − Cl − HCO3. (2007)

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