Table 2

Chemistries

ComponentValueReference rangeInterpretation
Blood urea nitrogen47 mg/dL2–25 mg/dLHigh
Serum Cr5.97 mg/dL0.60–1.3 mg/dLHigh
Fractional excretion of sodium14%<1% prerenal,
>2% intrinsic or postrenal
Intrinsic or postrenal acute kidney injury
BUN/Cr ratio7.9>20 prerenal,
<20 intrinsic or postrenal
GFR9 mL/min≥60 mL/minEnd-stage renal disease
  • Patient’s baseline Cr was 1.3 mg/dL, and baseline GFR was 42 mL/min.

  • BUN, blood urea nitrogen; Cr, creatinine; GFR, glomerular filtration rate.