Alacrity, during ICU rounds: "Okay, so this guy is getting a packed red blood cell transfusion. What was his pre-transfusion PCV?"
Student: "I think it was 12%."
Alacrity: "If I recall correctly, he's also pretty azotemic. How are his kidney values today?"
Student: "His creatinine was 12.6."
Alacrity: "Well, that sucks. Your PCV and your creatinine should not be the same number."