it is the urine culture not the routine urinalysis that gives the definitive answer. keep in mind that nearly 50% of women with "classic" urinary tract infection symptoms (burning on urination frequency and urgency) do not have a uti. other causes such as urethritis urethral irritation from clothing/soaps/sexual activity and the various types of vaginitis should be considered as other possibilities.
can you have a uti/bladder infection even if urinalysis done by a lab is negative for bacteria? . (u/a also negative for everything else. )