Yes, I have had 3 pups with this. One is currently living. You cannot diagnose a pup with PLN based on one urine test. Did the blood work show a lowered albumin? I am assuming it may have...or the vet would not have diagnosed this as protein can be in the urine for other reasons. Did they do a UPC? (urine protein creatinine ratio)
I would definitely hold off on surgery until all of this is clear.
If you can, a consult with an internal med specialist might be helpful, but isn't totally necessary. Your vet should know how to treat this.
With the first pup who was diagnosed with PLN I was told she had probably at most one year to live. She went on to live for 4 1/2 years. Here is a link to her story:
http://www.yorkietalk.com/forums/sic...phropathy.html