Take a look at some initial diagnostic testing below.
Urinalysis/microscopy, urine electrolytes
Urine sediment
Basic labs 
Update your differential diagnosis and choose your top 2 diagnoses below:
Acute interstitial nephritis (AIN)
Membranous nephropathy
Diabetic nephropathy
Amyloidosis
Anti-glomerular basement membrane (GBM) disease
Obstructive nephropathy
Acute tubular necrosis (ATN)
Multiple myeloma
Hypovolemia
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Case 3 Introduction
Case 3 Physical Exam