1. What gauge needle is most often used for blood gas collection? 2. Define collateral circulation, and state which test is used to determine whether this is present. 3. For an arterial collection,...

1. What gauge needle is most often used for blood gas collection?

2. Define collateral circulation, and state which test is used to determine whether this is present.

3. For an arterial collection, at what angle is the needle inserted into the artery?