Na⁺ − (Cl⁻ + HCO₃⁻). Correct for albumin.
mmol/L
mmol/L
mmol/L
Anion gap
26 mmol/L
High anion gap
Low: check albumin, lab error, myeloma, lithium/bromide
Normal (lab dependent, ≈ 8-12)
High anion gap
Formula
na - (cl + hco3)
References
Used in
Calculators support, not replace, clinical judgement. Check inputs and units, and confirm doses with your unit protocol.