Methods and compositions for diagnosis and prognosis of renal artery stenosis

A method of assigning a risk of an adverse outcome to a patient suffering from renal artery stenosis, comprising:

• performing an immunoassay that detects Neutophil Gelatinase-Associated Lipocalinon (NGAL) on a body fluid sample obtained from said patient, wherein said immunoassay comprises (a) contacting said body fluid sample with a solid phase comprising an antibody that detects NGAL, and (b) detecting binding to said antibody, thereby providing an NGAL assay result;
• comparing said NGAL assay result to a baseline NGAL result;
• and
• relating the NGAL assay result to the patient's risk of an adverse outcome by assigning an increased risk of an adverse outcome to said patient when said NGAL assay result is greater than said baseline NGAL result, or by assigning a decreased risk of an adverse outcome to said patient when said NGAL assay result is less than said baseline NGAL result.