Yep, many institutions have a nurse 'buddy-check' insulin doses. Now, WHY would they do that, if other nurses never made mistakes on the dose??
One of my worst mistakes was in reading the following doctors order:
"2 units PRBC over 2-3 hours, with 40 mg. of Lasix in between"
I looked at it, and decided, "Okay, 45 minutes per unit, no problem!" I was doing agency work on a medical floor, and was newly graduated, and not used to giving blood. If I'd had more experience, I would have known you NEVER GIVE BLOOD THAT FAST!! The order SHOULD have read "over 2-3 hours EACH unit"! Well, it wasn't the doctor who wound up wearing the goat horns for writing a lousy order, but li'l ol' me!
Patient suffered no harm...that's the important part! And I learned an important lesson about double-checking dr's orders, and unit policy/procedure manuals, if I'm unfamiliar with a procedure.