This page explains what a contrast extravasation is, how it is treated, and symptoms to watch for. DOWNLOADABLE PDF: Contrast Extravasation.
The amount of fluid a child needs depends on many factors including their age, their gender, the weather and how much physical activity they do, but generally they should aim to drink about 6-8 glasses of fluid per day (on top of the water provided by food in their diet).
The chart below will give you an estimate of how much fluids your child should drink in a 24 hour period. This is just an estimate and drinking less is o.k. so long as your child does not have the signs of dehydration yet.