Jason, an 8 year old with type 1 DM is being seen for a 3-day history of frequency and nocturia. He denies flank pain and is afebrile. The urinalysis result is negative for blood and nitrites but is positive for a large amount of leukocytes and ketones. He has a trace amount of protein. Which of the following is the best test to order initially? A) Urine for culture and sensitivity
B) 24-hour urine for protein and creatinine clearance
C) 24-hour urine for microalbumin
D) An intravenous pyelogram