DD 4yrs has always been a good drinker, in that she has always had plenty of water and I haven’t had to keep prompting her to drink as I know some children need. Recently she seems to be requesting cups of water much more frequently, this evening for example she must have had 4 cups of water. She hasn’t had anything salty to eat, I’m beginning to worry this isn’t right - if you were me would you be requesting blood tests?