Renal biopsy is the<unk>  study of choice, however, since it is an invasive procedure, CT scan without contrast of the abdomen is usually preferred.
Analgesic nephropathy diagnostic study of choice
Acute kidney injury diagnostic study of choice
Interstitial nephritis diagnostic study of choice
Bladder cancer diagnostic study of choice
Kidney stone diagnostic study of choice
Lupus nephritis diagnostic study of choice
Nephrotic syndrome diagnostic study of choice
Pyelonephritis diagnostic study of choice