The other day at work I had a patient admitted for an infected hip prosthesis; he had a revision and was on IV antibiotics post-op. His medical hx included a cardiac valve replacement, so he was on a heparin drip. There was a student nurse assigned to the patient; the nursing instructor works per diem on my unit. His crit was 25 so I was getting ready to hang some RBC's. He had a double lumen PICC with the heparin infusing through one port, and I was infusing the blood through the other port. I was explaining to the student the protocol for transfusion when the instructor came in and said to the student "are you ready to hang his antibiotic?" I gently reminded her of the hospital policy that heparin must run alone (we can't piggy-back anything with heparin, insulin, blood or albumin) but she said "I called the pharmacy and they said heparin and ceftriaxone are compatible." I didn't want to argue or cause a scene, but I didn't think it was appropriate to set that kind of example for the student! So I said "let's wait until after the blood is done." The instructor took down the antibiotic and left the room. I'm don't know if I handled the situation right...