Take a look at some initial diagnostic testing below.
Urinalysis/microscopy, urine electrolytes

Urine sample

Basic labs 

Kidney Ultrasound

Has your differential diagnosis changed? Choose your top 3 before moving on!
Post-infectious glomerulonephritis (PIGN)
Obstructive nephroprathy
Rhabdomyolysis
Acute interstitial nephritis (AIN)
Systemic lupus erythematosus (SLE) nephritis
Anti-nuclear cytoplasmic antibody (ANCA) associated glomerulonephritis
Acute tubular necrosis (ATN)
IgA nephropathy
Hypovolemia
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Case 4 Index
Case 4 Introduction
Case 4 Physical Exam