Discussion: Microscopic evaluation of urine sediment has become a lost art among physicians, especially since passage of the Clinical Laboratory Improvement Amendments (CLIA) in 1988, which mandated that only CLIA-certified personnel could perform most laboratory tests. While it is probably unrealistic to call for training in microscopic urinalysis for all physicians, hospitalists in particular would benefit from such training, and at the very least should be mindful that laboratory urinalysis results may miss subtle findings that can be invaluable in diagnosing acute renal failure. This study points out the need for greater oversight and training of laboratory personnel, and serves as a reminder to clinicians that laboratory results should not be considered the gold standard. TH
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