Acid–Base Calculator (ABG)
Enter ABG + electrolytes. Outputs primary process, expected compensation, and anion gap (albumin-corrected).
Primary Process
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Expected Compensation
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Anion Gap
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Mixed Disorder?
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Compensation Details
| Scenario | Rule | Expected | Measured | Match? |
|---|---|---|---|---|
| Metabolic Acidosis | Winter’s: PaCO₂ = 1.5×HCO₃ + 8 ± 2 | — | — | — |
| Metabolic Alkalosis | PaCO₂ = 0.7×HCO₃ + 20 ± 5 | — | — | — |
| Resp Acidosis (acute) | HCO₃ = 24 + 1 × (ΔPaCO₂/10) | — | — | — |
| Resp Acidosis (chronic) | HCO₃ = 24 + 3.5 × (ΔPaCO₂/10) | — | — | — |
| Resp Alkalosis (acute) | HCO₃ = 24 − 2 × (ΔPaCO₂/10) | — | — | — |
| Resp Alkalosis (chronic) | HCO₃ = 24 − 5 × (ΔPaCO₂/10) | — | — | — |
ΔAG / ΔHCO₃⁻ (Delta–Delta)
| ΔAG | ΔHCO₃⁻ | Ratio (ΔAG/ΔHCO₃⁻) | Interpretation |
|---|---|---|---|
| — | — | — | — |
Rule of thumb: ≈1 → pure AG metabolic acidosis; <1 → additional non-gap metabolic acidosis; >2 → additional metabolic alkalosis.
Notes.
Expected compensation is physiologic, not “normalization.” Deviation outside the expected range suggests a mixed disorder. Albumin correction uses 2.5 mEq/L per 1 g/dL albumin below 4.0.