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Urea Nitrogen (BUN), Serum

Test Code
BUN


CPT Codes
84520

Preferred Specimen
1.0 mL serum


Transport Container
Gold Top Tube/Serum Separator Tube


Transport Temperature
Room Temperature or Refrigerate.


Methodology
Enzymatic

Reference Range
>60 yrs8-23 mg/dL
18-60 yrs6-20 mg/dL
1-17 yrs5-18 mg/dL
<1 yrs4-19 mg/dL


Clinical Significance
Urea is the major end product of protein metabolism.  BUN is the most widely used screeing test for renal function.  When used in conjuction creatinine determination it can aid in the differential diagnosis of the three types of azotemia: prerenal, renal and postrenal.  Elevations in BUN are seen in inadequate renal perfusion, shock, diminished blood volume(prerenal causes), Chronic nephritis, nephrosclerosis, tubular necrosis, glomerular nephritis(renal causes) and urinary tract obstruction(postrenal causes).




The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.