What is the primary purpose of arterial blood gas analysis?

What is the primary purpose of arterial blood gas analysis?

• A. To measure blood glucose levels
• B. To assess liver function
• C. Evaluate oxygenation, ventilation, and acid-base balance
• D. To determine electrolyte balance

Answer: (C)

ABG analysis gives a snapshot of how well the lungs are delivering oxygen to the blood and removing carbon dioxide, while also showing the body’s acid-base status. It measures PaO2 and SaO2 to assess oxygenation, PaCO2 to gauge ventilation, and pH along with bicarbonate (HCO3-) and base excess to determine acid-base balance. Together, these values reveal whether a patient is hypoxemic, hyper- or hypoventilating, and whether there’s a metabolic or respiratory disturbance and if compensation is occurring. This information guides how you adjust oxygen therapy and ventilator settings and helps identify metabolic or respiratory failure early.

ABG analysis gives a snapshot of how well the lungs are delivering oxygen to the blood and removing carbon dioxide, while also showing the body’s acid-base status. It measures PaO2 and SaO2 to assess oxygenation, PaCO2 to gauge ventilation, and pH along with bicarbonate (HCO3-) and base excess to determine acid-base balance. Together, these values reveal whether a patient is hypoxemic, hyper- or hypoventilating, and whether there’s a metabolic or respiratory disturbance and if compensation is occurring. This information guides how you adjust oxygen therapy and ventilator settings and helps identify metabolic or respiratory failure early.