Please choose the correct ending to complete the given sentence: Health: [header] How to draw an arterial blood gas [title] Keep an ice pack ready and labelled with the patient's name. [step] Arterial blood is prone for clotting and needs to be put in an ice pack as soon as it is drawn. [title] Take a 2cc syringe and load about 0.2cc of heparin solution in it.

Ending1: [title] Work the syringe/ice-pack's plunger down for about 30 seconds. [step] That will force heparin solution slowly all the way down into the syringe. Ending2: [step] Heparin prevents clotting but too much of it can interfere with the results. [title] Check the radial pulsation of the patient. Ending3: [step] This is known as cortisone. Squeeze about 16 to 24 drops of the solution into the syringe. Ending4: [step] Since you are going to draw heparin, make sure you fill the syringe about 1/4 of the way full. This is usually indicated on the packaging but if you can't find it, look in your refrigerator/pantry.

Answer format: ending1/ending2/ending3/ending4