<prompt> Following are risk factors for contrast nephropathy EXCEPT-MetforminDehydrationNSAIDsHalf normal saline  <response>: Risk factors for contrast nephropathy are- Older age CKD Hypoalbuminemia Pre renal Azotemia Dehydration Severe infection Diabetic nephropathy Patients on other nephrotoxic drugs PPIS, NSAIDS, aminoglycosides, amphotericin B, cisplatin, carboplatin, Cyclosporine ,ARBS ACE-inhibitors Ref:Harrison 20 th edition pg no 2103,2099 