The case for the saline flush.
D003363:Cost Control; D006493:Heparin / Q000008:administration & dosage; D006801:Humans; D007262:Infusions, Intravenous / Q000191:economics*; D012965:Sodium Chloride / Q000008:administration & dosage*
D012965:Sodium Chloride; D006493:Heparin