ABGs are typically collected from an artery, most commonly the radial artery. Before the sample is taken, an Allen test is performed to ensure adequate collateral circulation to the hand. The procedure involves inserting a needle into the artery and drawing a small amount of blood into a heparinized syringe to prevent clotting. The sample is then sent to the laboratory for analysis. Nurses must be skilled in this procedure to minimize patient discomfort and prevent complications.
