The client admitted with deep vein thrombosis is prescribed heparin by constant infusion after an initial dose of 5000 units intravenous push. The heparin comes prepared 20,000 units in 500 mL of D5W. The bolus heparin was administered at 0800 and the infusion initiated per protocol at 25 mL/hr. At the 1900 shift change, how much heparin had been administered?