Toddler urine test possible uti came back neg urine protein 30 for couple of months she's a little dehydrated what causes protein doctor not worried?

Mgt. I would suggest keeping her well hydrated, and discussing having a renal ultrasound performed. Has she had more than one UTI? Additional details would be helpful: is there a history renal disease in the family, is her blood pressure normal, has she had any swelling?