Final answer:
A blood gas machine primarily analyzes parameters such as pH, PO₂, pCO₂, and bicarbonate levels, but may also include lactate. It does not typically analyze blood clotting parameters like INR, ACT, or platelet count.
Step-by-step explanation:
A blood gas machine is designed to analyze parameters related to respiratory and metabolic function in the blood. These can include pH levels, partial pressures of oxygen (PO₂) and carbon dioxide (pCO₂), and bicarbonate levels (HCO₃⁻).
Of the options provided, HCT (hematocrit), NA⁺ (sodium), and PO₂ would commonly be analyzed in a blood gas test. However, the last parameter in each option varies. Lactate is a relevant parameter for metabolic status and may be included in a blood gas analysis, especially in cases of metabolic acidosis. Blood gas machines do not typically measure INR (international normalized ratio, used for blood clotting), ACT (activated clotting time), or platelet count, as these are related to coagulation, not metabolic or respiratory function.