Just after I wrote my last post, the nephrologist came in to see David. I've seen her several times and brought The Boy for an office visit, but she still introduced herself. I guess as a courtesy...she is very nice and very polite.
She said that some of the problem could be just the amount of fluid that he's had to process. He has had two transfusions (one each of blood and platelets), and he has been on an IV since he has been here. The drip is a bit over an ounce an hour, so not too much. He does look a bit puffy. He also has a bit of the swelling in his scrotum.
She has ordered another urinalysis, and he will be having an ultrasound of his kidney. If he had both, they'd do both, but you know.
He is also back to having his BP med twice a day, for now.