I always try to aspirate for blood before starting a new bag of solution, or starting an antibiotic. When I am unable to see blood, but the saline flush goes through OK, I am still worried that the IV isn't in the vein and that I am going to infiltrate the solution into the pt's tissue.
I think I am having a hard time with IV's in general, starting, saline locking, and IV push medication. Does this fear go away with time?