Which one should i believe? the kub utz finding that i have "renal parenchymal disease" or my normal bun, creatinine, & urinalysis. thank you.

See below: Depends a bit in exactly what they saw, but on ultrasound, that's usually a bit of a soft call. I'd go with the creatinine in general.

KUB: Kub (kidney, ureters, bladder) x-rays, despite its name, is not generally useful to investigate pathology of the kidneys, although it may occasionally detect calcium kidney stones. Although they do not rule out a parenchymal kidney condition, a normal serum creatinine, estimated gfr, and urinalysis is generally indicative of normal kidney function.