Method of choice for a New born child not passing urine for 36 hours :

A history of Anuria suggests Acute Renal failure. Ultrasonography is the ideal imaging tool in Renal failure because of its non dependence on Renal function. As it allows visualization of : Pelvicalyceal system ofAssessment of Renal Size o Structural anomalies and calculi . Note - In this question DTPA scan has not been provided as an option. So, the best answer is USG.