MDCalc

Arterial Blood Gas (ABG) Analyzer

Interprets ABG.

This analyzer should not substitute for clinical context. Sodium and chloride are required for anion gap calculation.

If respiratory process present, chronicity

Result:

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Advice
  • Technique matters when it comes to collecting the blood specimen.
  • Inaccurate results may be due to obtaining a venous sample instead of an arterial sample, the presence of air bubbles in the specimen (lowering PaCO2), or a delay in analyzing the sample (lowering PaO2). 
Management

Management varies significantly depending on the ABG results, along with the clinical scenario.

Critical Actions

1. Ensure proper sampling of blood specimen.

2. Consider repeating ABG if results do not fit the patient history and clinical scenario. 

3. A venous blood gas (VBG) can also be checked to see if it correlates with ABG results (only PaO2 should be different).

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