AG without KMost common convention
— mEq/LAcid–base · Laboratory interpretation
Anion Gap
Calculate the gap with or without potassium and show albumin correction only when albumin is supplied.
Evidence recordSources and method currentVersion 0.1 · Updated July 17, 2026
Step 1
Enter same-draw labs
Private by design. Values are calculated on this device and are not saved or sent to analytics.
Step 2
Compare results
AG with KRequires potassium
— mEq/LAlbumin-corrected, no KRequires albumin
— mEq/LAlbumin-corrected, with KRequires both optional values
— mEq/LNo automatic diagnosis.Trend, albumin, lactate, ketones, renal function, toxic exposures, blood gas data, and the local reference interval determine clinical meaning.
Evidence packet
What this tool is based on
This versioned record keeps the citations, equation or decision rule, units, test coverage, intended population, and exclusions attached to the tool.
How evidence review works →Intended population
Patients with contemporaneous serum electrolytes when an anion-gap estimate supports acid–base assessment.
Equation record
Na − (Cl + HCO3), optional K inclusion, and optional albumin correction AG + 2.5 × (4 − albumin g/dL).
Unit handling
Electrolytes accept mEq/L; albumin accepts g/dL. Optional fields remain visibly absent rather than being assumed.
Test coverage
With- and without-potassium calculations, albumin correction, optional-input behavior, and invalid inputs.
Do not skip
Limitations and exclusions
- Use the reporting laboratory's own reference interval and potassium convention.
- Values from different blood draws may create a misleading gap.
- Albumin correction is an estimate derived for hypoalbuminemia and does not replace full acid–base evaluation.
- A normal result does not exclude clinically important lactate, ketones, toxic exposure, or mixed disorders.
One clearly labeled, contextually relevant sponsor may support this reference area. Sponsorship will never interrupt inputs, obscure results, influence formulas, or imply clinical endorsement.
About this tool
Anion Gap Calculator with Albumin Correction
Use this anion gap calculator to compute the gap with or without potassium and to view an albumin-corrected estimate when albumin is supplied.
The selected formula and every included electrolyte remain visible. Reference ranges and albumin correction vary, so interpret the result with the laboratory method and clinical context.