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BUN, Blood Urea Nitrogen serum

Test Code
BUN


Preferred Specimen
Serum, 0.5 mL minimum


Transport Container
SST tube


Transport Temperature
Unspun specimen stable for 2 hours at room temp., separated serum stable for 1 day at room temp., 7 days if refrigerated


Reference Range
See report for normal ranges. Critical Value: >100 mg/dL


Clinical Significance
Urea is the major nitrogen-containing metabolic product of protein catabolism in humans, composing over 75% of the nonprotein nitrogen eventually excreted.The BUN test is primarily used, along with the creatinine test, to evaluate kidney function in a wide range of circumstances, to help diagnose kidney disease, and to monitor patients with acute or chronic kidney dysfunction or failure.




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.