Okay so yesterday ,a lady from the lab approached me to draw lab from a peripheral iv site that has been used for days,told her I can't that if it's a newly inserted iv I would,informed my charge nurse and house supervisor and they equally said no.So today ,my unit director asked me why I didn't get blood for lab and I told her the same thing I told d lab lady and she said No,it doesn't matter.So my question is,is it really a good practice to draw samples from an iv that has been in situ for days?