I'm currently in nursing school. Today at clinicals I had to give a heparin injection. The ordered dose was 7,500 units subcutaneous. I was supplied with two 5,000 unit 1 ml vials. When I did my math calculation I came up with that the patient would receive 0.75 units of heparin. However, my clinical instructor made me give 1 1/2 units of heparin. Can someone tell me why I had to give the 1 1/2 units and not 0.75 units?