Electrolytes

Anion gap (albumin-corrected)

Serum AG = Na − (Cl + HCO₃). Add 2.5 × (4 − albumin g/dL).

metabolic acidosisAG

Required inputs

  • Na (mEq/L)
  • Cl (mEq/L)
  • HCO₃ (mEq/L)
  • Albumin

Equation or source

Figge J. J Lab Clin Med 1992;120:713.

Provenance and release status

Equation / algorithm
Serum AG = Na − (Cl + HCO₃). Add 2.5 × (4 − albumin g/dL).
Formula version
ag-corr-v1
Tool version
2.4.0
Clinical risk class
A. EDUCATIONAL CALCULATOR
Release status
Verified
Source status
Direct primary or authoritative source identifier resolved
Clinical review status
Independent formula verification completed; clinical review date not documented
Clinical review date
Clinical review date not yet documented

Assumptions

  • Entered values and units are accurate and apply to the population described by the cited source.
  • The published equation or rule is being used without a patient-specific clinical adjustment.

Important limitations

  • The result does not replace clinical assessment or establish a diagnosis.
  • Performance outside the source population may differ.
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