Darian went to the pediatric urologist last week. After another ultrasound he was given a clean bill of health!! There is a small (20%) chance he has a blockage, but there is no easy way to test for it. We were advised (and I agree) to keep the possibility in the back of our head in case anything ever comes up. If he starts running a high fever that can't be explained, or begins to get a series of kidney/UTI/bladder infections we may want to get him tested at that point.
One thing I learned I didn't know was regarding his circumcision. The urologist said by having him circumcised we reduced his chance of having any complications 10 fold.
What a relief!