Our 300 bed hospital is having an increase in "contaminated" blood specimens drawn from central lines. We have convened a committee to investigate the possible reasons and solutions. The contaminants are mostly IV fluids and meds, especially Heparin. Obviously these contaminated specimens are costly and ultimately cause delays in patient care and treatment. We currently stop all infusions thru all lumens for a minimum of 1 minute and max of 2 minutes, flush the line w/ 10 ml NS and then discard 5 ml prior to drawing the specimen. We draw hub to hub, not thru the cap and we flush with 20 ml of NS following the draw. Does anyone have any advise or thoughts for what might help reduce the occurrence of this problem?