Abg Calculator
Calculate arterial blood gas (ABG) parameters including pH, PaCO2, PaO2, HCO3, base excess, and anion gap. Useful for assessing acid-base balance and oxygenation.
Published by:
isCalculator Editorial Team
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How to Use the ABG Calculator
This calculator interprets arterial blood gas (ABG) results and calculates base excess and anion gap. All inputs are in standard medical units.
- Enter values for pH, PaCO2 (mmHg), PaO2 (mmHg), HCO3 (mmol/L), Na+ (mmol/L), and Cl- (mmol/L). Use the placeholders as a guide.
- Click "Calculate" to process the data.
- Review the results displayed below:
- Base Excess (BE) – indicates metabolic component (normal: -2 to +2 mmol/L).
- Anion Gap (AG) – helps identify metabolic acidosis type (normal: 3–12 mmol/L).
- Interpretation – describes acid-base status (e.g., acidemia, respiratory alkalosis).
Tips: Ensure values are within the allowed ranges (shown in input fields). All inputs are required. The calculator uses standard formulas: BE = 0.02786 × PaCO2 × 10^(pH-7.4) – 0.02786 × PaCO2 + 0.8954 × HCO3 – 24; AG = Na – (Cl + HCO3).
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Frequently Asked Questions
An ABG calculator helps interpret arterial blood gas results by calculating base excess, anion gap, and providing an interpretation of acid-base status.
You need pH, PaCO2, PaO2, HCO3, Na+, and Cl- values from an arterial blood gas report.
Base excess is calculated using the formula: BE = 0.02786 × PaCO2 × 10^(pH-7.4) - 0.02786 × PaCO2 + 0.8954 × HCO3 - 24.
