Laboratory results come back on a newly admitted patient
They are as follows: serum BUN, 64 mg/dL; serum creatinine, 2.4 mg/dL; urine osmolality, 210 mOsm/kg; specific gravity, 1.002; and urine sodium, 96 mEq/L. The urine output has been 120 mL since admission 2 hours ago. These values are most consistent with which of the following diagnoses?
a. Prerenal failure
b. Postrenal failure
c. Oliguric renal failure
d. Acute kidney injury (AKI)
D
Urinary sodium less than 10 mEq/L (low) suggests a prerenal condition. Urinary sodium greater than 40 mEq/L (in the presence of an elevated serum creatinine and the absence of a high salt load) suggests intrarenal damage has occurred. The urine output does not seem to suggest oliguria. The other options do not fit the data as presented.
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