Review Question - QID 218594

A 5-year old male is evaluated in the emergency department by the orthopaedic resident on duty. The patient's mother notes that he has been hesitant to put weight on his right leg, and he has been complaining of "really bad" leg pain, although she notes that he seems to be a little less fussy than he was this morning. He is a kindergarten student, and many of his classmates have been ill recently with sniffles and the cold. On exam, the patient is holding his hip in a flexed, abducted and externally rotated position. During range of motion testing, you note an internal rotation deficiency when compared to the contralateral limb. Which of the following lab values and/or vital signs, if present, would be most suggestive of the diagnosis of transient synovitis over septic arthritis?