Final answer:
ABG samples are most commonly taken from the radial artery, with the femoral and brachial arteries as alternatives. They are used to assess the levels of oxygen and carbon dioxide, as well as the pH of blood.
Step-by-step explanation:
Most Arterial Blood Gas (ABG) samples are drawn from the radial artery. However, the femoral and brachial arteries are also common sites for obtaining ABG samples. This procedure is typically performed to assess the levels of oxygen (O₂), carbon dioxide (CO₂), and the pH of blood. Through ABG analysis, healthcare professionals can determine how well the lungs and kidneys are working and the effectiveness of oxygen therapy if the patient is receiving any.