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What is ABG is taken from all Except and explain in detail?
An aerial-blood gas test measures the amounts of aerial gases, such as oxygen and carbon dioxide. An ABG test requires that a small volume of blood be drawn from the radial aery with a syringe and a thin needle, but sometimes the femoral aery in the groin or another site is used Aerial blood for blood-gas analysis is usually drawn by a respiratory therapist and sometimes a phlebotomist, a nurse, a paramedic or a doctor.Blood is most commonly drawn from the radial aery because it is easily accessible, can be compressed to control bleeding, and has less risk for vascular occlusion. The selection of which radial aery to draw from is based on the outcome of an Allen's test. The brachial aery (or less often, the femoral aery) is also used, especially during emergency situations or with children. Blood can also be taken from an aerial catheter already placed in one of these aeries. Ref Davidson 23rd edition pg 377