ICU and Critical Care · Pulmonology
Arterial pH (Henderson–Hasselbalch) calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
mmol/L
Allowed range: 5–45 mmol/L
mm Hg
Allowed range: 10–100 mm Hg
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Clinical inputs
- Serum bicarbonate (mmol/L)Accepted range: 5 to 45
- Partial pressure of arterial carbon dioxide (PaCO2) (mm Hg)Accepted range: 10 to 100
Primary source
Henderson LJ. The theory of neutrality and its application to blood and to aqueous solutions of biological importance. J Biol Chem. DOI: 10.1016/S0021-9258(18)85243-4. PMID: 19974646. Scope: arterial pH = 6.1 + log10([HCO3−] / (0.03 × PaCO2)) with bicarbonate in mmol/L and PaCO2 in mm Hg using the standard solubility coefficient 0.03. (1908)
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