When asking why blood is drawn 'below' an IV site, it is presumed that this means distal (or further from the heart) when compared to the IV.
The reason for drawing blood distal to the site of IV...
You can draw blood above an iv if the fluids running have been stopped and you have waited at least ten minutes before drawing the blood after the fluids were stopped.
This could be for a number of reasons. The tube that was placed on the needle holder after the venipuncture, may have been void of vacuum. The needle may have gone completely through the vein to the...