I'm intrigued by the concept of 4 hour IV rehydration in the office with subsequent discarge home. Where does oral rehydration come in? My practice is to use ORS unless specific indications for IV therapy exist, i.e. continuing profuse vomiting preventing oral rehydration, or intravascular volume depletion with shock. In either of these situations, discharge home after 4 hours would seem inappropriate. I use ORS because it is less invasive, less unpleasent for the child, safer and cheaper, or so I was taught! Simon Ling Department of Child Health University of Glasgow