Internal Medicine · Critical Care

Figge Albumin-Adjusted Anion Gap calculator

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

Clinical inputs

Serum sodium (mmol/L)

Serum chloride (mmol/L)

Serum bicarbonate (mmol/L)

Serum albumin (g/dL)

Figge adjustment uses a reference albumin concentration of 4.4 g/dL: adjusted anion gap = observed anion gap + 2.5 × (4.4 − albumin in g/dL).

Result

Complete all required inputs to calculate the score.

Formula inputs

Serum sodium (mmol/L)Accepted range: 50 to 250
Serum chloride (mmol/L)Accepted range: 20 to 200
Serum bicarbonate (mmol/L)Accepted range: 0 to 80
Serum albumin (g/dL)Accepted range: 0 to 10

Primary source

Figge J et al. Anion gap and hypoalbuminemia. Crit Care Med. DOI: 10.1097/00003246-199811000-00019. PMID: 9824071. Scope: albumin correction of the sodium-minus-chloride-minus-bicarbonate anion gap in critically ill patients. (1998)

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