BUN with urea reduction ratio

Test Code

BUN WITH URR

Alias/See Also

Blood Urea Nitrogen
Chemistry

Includes

BUN, post dialysis
Urea reduction ratio calculation

Preferred Specimen

Gold top tube

Minimum Volume

2 mL

Other Acceptable Specimens

Light green top tube

Instructions

Order a BUN,PRE DIALYSIS test so that a ratio can be calculated.

Transport Temperature

Refrigerate

Specimen Stability

Room temperature: 7 days
Refrigerated (2-8°C): 7 days
Frozen (-20°C or colder): 1 year

Methodology
Urease

Setup Schedule

Daily

Report Available

TAT 1 day

Reference Range

Test	Reference range	Units
BUN, post dialysis	7 - 25	mg/dl
Urea reduction ratio	50 - 90	%

Clinical Significance

Measurements obtained by this test are used in the diagnosis of certain renal and metabolic diseases.

Performing Laboratory
Test performed in these BACL Chemistry Labs
Contact: Jonathan Dryjowicz-Burek, West Roxbury 857-203-5973
Alternate contact: Joseph A. Manzone Jamaica Plain 857-364-5092

Last Updated: May 17, 2022

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.