ABG Analyser (kPa/mmol·L⁻¹ default)

Inputs

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Normal ~ 7.35–7.45

PaCO₂ kPa

Normal: 4.7–6.0 kPa (35–45 mmHg)

HCO₃⁻ (mmol/L)

Normal: 22–26

PaO₂ kPa

Optional (not used in acid-base)

Na⁺ (mmol/L)

K⁺ (mmol/L)

Cl⁻ (mmol/L)

Lactate (mmol/L)

Albumin (g/L)

Used for corrected AG & Stewart

Phosphate (mmol/L)

Used in Stewart SIDe

Notes: Unit toggle converts only gas pressures. Concentrations remain in mmol/L (albumin in g/L). Stewart: SIDa = (Na + K + Ca + Mg) − (Cl + Lactate). SIDe = 2.46×10⁻⁸×PaCO₂(mmHg)/10^−pH + Alb_mmol/L×(0.123·pH−0.631) + Phos×(0.309·pH−0.469). SIG = SIDa − SIDe.

Summary

Explain step-by-step

Enter values and click Calculate.

Expected Compensation Winter’s & respiratory rules

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Anion Gap & Delta Ratio Albumin-corrected AG & gap analysis

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Stewart (SID) SIDa / SIDe / SIG

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Clinical caution

This tool supports clinical reasoning but does not replace clinical judgement or local guidelines.