Imaging Recommendations for Suspected Kidney Stones in Children

Primary Imaging Recommendation

The American College of Radiology recommends ordering a renal and bladder ultrasound as the initial imaging study for suspected kidney stones in children, avoiding radiation exposure while providing adequate diagnostic information in most cases 1, 2, 3
Ultrasound of the kidneys and bladder is the appropriate first-line imaging modality for evaluating suspected nephrolithiasis in pediatric patients, with a sensitivity of approximately 75% for detecting urinary tract stones, but only 38% for ureteral stones specifically 1, 3

For children with painful hematuria, ultrasound remains the initial imaging choice, even when urolithiasis is strongly suspected, but if ultrasound is negative and clinical suspicion remains high, consider low-dose unenhanced CT as the next step, which has sensitivity and specificity both well above 90% for stone detection 1, 3
For asymptomatic or painless hematuria, ultrasound is highly appropriate as it can evaluate for other causes of hematuria, including renal masses, anatomic abnormalities, and bladder lesions, and unenhanced CT may be considered after a negative ultrasound if there is strong suspicion for asymptomatic nephrolithiasis 2, 3

The American College of Radiology recommends against ordering CT as the first imaging study unless there are exceptional circumstances, due to the high risk of recurrence and multiple imaging studies throughout the child's lifetime, significantly increasing cancer risk from cumulative radiation exposure 1
Plain radiography (KUB) has limited utility due to small stone size and obscuration by bowel contents in children, with a lower sensitivity compared to ultrasound and CT 1

Consider low-dose unenhanced CT in specific scenarios, including negative ultrasound with persistent symptoms and high clinical suspicion, when stone detection would directly impact treatment decisions, or when there is a poor response to conservative management, as modern CT techniques can achieve radiation doses lower than traditional IVU 1, 3