I think everyone has a different retention pattern. I didn't hold it in my ankles, which is always the first place they look. My fingers would swell like crazy, though. Post-transplant, I judge how well I've hydrated for the day by rubbing my fingers between each other. If all I feel is bone - it's time to drink up!
On the flip side of that, if you can pinch the skin on the back of your hand and it stays "tented" in the pinch position - you are dehydrated. Good to know if you are having low bp or dizzy spells, and your aren't sure if it's fluid or meds at issue.
Am I the only person who tried this as soon as I read it?