Re: Blood draw from IVs?
My ER recently did their own study after reviewing the hemolysis rates of specimens we draw and feeling that it was too high. We, like many other ERs, draw blood back from the angiocaths immediately after starting them and before they are flushed.
For one week during the trial, a phlebotomist from the lab was assigned to the ER and she drew blood straight stick (no butterfly needles) from every patient that came in. If they needed an IV then they got stuck twice. (Codes and traumas were a different story obviously)
We all thought that the hemolysis rate would be so much better and we got excited at the prospect of possibly having a dedicated phlebotomist in the ED.
Unfortunately the results of the trial were surprising as the phlebotomist draws had a hemolysis rate that was so slightly better than ours that it was not even statistically significant. Interesting. So what we determined was that it has a lot more to do with technique...for example, tourniquet time left on the patient has something to do with it I believe as well as obviously the size of the vein you are drawing from...an inner wrist vein drawn through a #22 ga may end up hemolyzed. Most times, I know immediately by how the blood looks going into the tube if it's going to be hemolyzed. Honestly, if I have any doubt at the time...I save the IV line and redraw from a straight stick..if it is a veinless person..I do an arterial stick with a butterfly.
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