Physicians have a few methods of diagnosing acute kidney injuries. Observing signs and symptoms is usually the first step. Tests to measure serum creatinine and urine output are also common.
Doctors may also use urine microscopy and urine electrolyte tests. Doctors typically order renal ultrasounds if they suspect a renal or postrenal cause. In cases where the underlying trigger is unclear, the patient will need a kidney biopsy.

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