Which trio of values is used to interpret arterial blood gas results?

Prepare for the Veterinary IV CFE Test with flashcards and multiple choice questions. Each question includes hints and explanations. Ensure success with our comprehensive test prep!

Interpreting arterial blood gases hinges on assessing the balance between acidity and the two main regulatory systems: the respiratory system and the metabolic (bicarbonate) system. The pH tells you whether the blood is acidic or basic. PaCO2 reflects the respiratory contribution to acid-base status because carbon dioxide acts as an acid in the body. HCO3- represents the metabolic, bicarbonate-driven component that buffers acids. By examining pH together with PaCO2 and HCO3-, you can identify whether there is a primary disorder and whether there is metabolic or respiratory compensation. That’s why the trio used to interpret ABG results is pH, PaCO2, and HCO3-. The other values serve different purposes: PaO2 and SaO2 assess oxygenation, lactate indicates tissue perfusion and shock, and base excess is a metabolic parameter related to the bicarbonate system but not the fundamental trio for interpretation.