Take a look at some basic labs below.
Basic labs
What’s the next best test to diagnose the etiology of this patient’s presentation (choose 1!)?
Complement levels
Not the best test here, we don’t evidence of nephritic syndrome or immune complex mediated disease. Try again!
Kidney biopsy
Ouch! Not a good idea here. Pick again!
24 hour urine collection for creatinine clearance measurement
This test is helpful in patient’s in whom estimated glomerular filtration rate (GFR) calculations may be inaccurate. A more accurate GFR value won’t help us right now. Try again!
Urinalysis and urine electrolytes
Excellent! Here they are: 
Position emission tomography (PET) scan
Though this test may be help to evaluate for metastatic disease in this patient, there is a better test to diagnose the etiology of his current presentation. Pick again!
Almost there – let’s finish up this case!
Case 25 Index
Case 25 Introduction
Case 25 Physical Exam
Case 25 Diagnostic Testing
NephSim