I would normally ask for a confirmation test but in a case like this there's nothing for them to check for. This is very odd. Only a 3 panel test, which is unusual, no uric acid? Doesn't make sense. And as far ass color,foaming and smell not really relevant. And again who is dumb enough to go around smelling someones urine? Not a medical professional for sure.
I would fight this. Call the lab and find out how they tested for uric acid. Ask why any medical professional would be smelling urine. And tell them you think that the urine sample must have been mixed up with somebody elses.
Tell us what all happened in the lab when you took your test. Did they follow procedures for chain of custody and documentation.
You may be able to get your states dept of Labor and industries to help you investigate. Just claim wrongful termination and they will check to make sure everything was done legally.