In this tutorial, we learn how to draw blood from an arterial line. First, you will need a catheter, tubing, regular iv tubing, 10 cc syringe, transducer, fluid bag, and iv saline bag. First, waste a couple ml's of blood by turning the stock cock off to the system and draw back a couple liters of blood. After this, turn the stock cock off the syringe and take out the syringe, then add a new one. Now, take your sample of blood and draw out 5 ml of new blood. Take out the syringe, then cap it and put it to the side. Next, clean the tubing and flush it with normal saline.