Brooke's fevers

At Brooke's 2 year check up, we talked with our PCP about her reoccurring fevers. After the appointment, Brooke had 5 vials of blood drawn to see if the PCP could tell what was causing the fevers. A tech called to say he didn't see anything but that our PCP would call in January when she returns to work. Well, she called... she didn't see anything glaring (which is good) but there were some abnormalities that she couldn't pin-point.

So we went back to see our PCP today to get a urine sample (seriously NOT fun with a little girl still in diapers; I'll spare the details, but basically even Jack was crying), order a kidney ultrasound and get more blood work done since the last time she had a fever so the PCP wanted to compare the results to when Brooke didn't have a fever.

The blood work came back totally normal. The PCP think the abnormalities from the blood work last month was due to her being sick (fever/runny nose). She is going on a guess that Brooke has urinary track infections (the fevers being the only symptom - fighting off the infection). So now we wait for the urine and ultrasound results to see if she is right.

UPDATE - the techs from the urine and ultrasound said they both came back normal. Still need to hear from our PCP on what she thinks and our next course of action because if everything is normal, what is causing these reoccurring fevers?