Looks like we're in the great NS shortage of winter 07/08. over the last few weeks our saline supply has dwindled down to nothing. all we have now is 1000cc bags of LR and what NS we have in trauma and ped bags. I recall in medic class we talked about situations when you might want to use LR, but not really when specifically not to use it. i know several medics (including myself) have started using locks when fluids aren't needed (since we suddenly have plenty of saline flushes, go figure). any thoughts on situations when not to use LR, besides when giving blood products that is, i think we all know that one.