What is the purpose of an arterial puncture?

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Multiple Choice

What is the purpose of an arterial puncture?

Arterial puncture is used to obtain blood for blood gas analysis. This test measures pH, partial pressures of oxygen (PaO2) and carbon dioxide (PaCO2), and bicarbonate, plus often oxygen saturation. Using arterial blood gives an accurate reflection of gas tensions and acid-base status as it represents the blood that leaves the lungs before tissues alter it, making it the best indicator of how well ventilation and gas exchange are functioning. The other tests listed rely on venous blood or plasma/serum: a glucose tolerance test assesses how the body handles a glucose load, a complete blood count analyzes cells in the circulation, and a lipid panel measures cholesterol and triglycerides in fasting serum. Arterial sampling specifically targets the needs of gas analysis and acid-base assessment.

Arterial puncture is used to obtain blood for blood gas analysis. This test measures pH, partial pressures of oxygen (PaO2) and carbon dioxide (PaCO2), and bicarbonate, plus often oxygen saturation. Using arterial blood gives an accurate reflection of gas tensions and acid-base status as it represents the blood that leaves the lungs before tissues alter it, making it the best indicator of how well ventilation and gas exchange are functioning.

The other tests listed rely on venous blood or plasma/serum: a glucose tolerance test assesses how the body handles a glucose load, a complete blood count analyzes cells in the circulation, and a lipid panel measures cholesterol and triglycerides in fasting serum. Arterial sampling specifically targets the needs of gas analysis and acid-base assessment.

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