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HelpTest Code BUN Urea Nitrogen
Specimen Type
Plasma
Container/Tube
Li-Heparin Mint Green Top
Offsite Collection Instructions
1. Collect sample following standard collection methods
2. Within 2 hours of collection the sample must be spun and
aliquoted
3. Transport refrigerated (2 – 8C).
Turnaround Time
4 hours
Test Includes
N/A
Preferred Volume
0.5 mL
UCMC Collection Instructions
1. Collect sample following standard collection methods
2. Within 2 hours of collection the sample must be received in
Laboratory Service Center
3. Transport room temperature (15 – 25C).
STAT Turnaround Time
1 hour
Test Usage
The determination of urea is the most widely used test for
the
evaluation of kidney function. The test is frequently used in
conjunction with the determination of creatinine for the
differential diagnosis of prerenal hyperuremia (cardiac
decompensation, water depletion, increased protein catabolism),
renal hyperuremia (glomerulonephritis, chronic nephritis,
polycystic kidney, nephrosclerosis, tubular necrosis) and
postrenal
hyperuremia (obstructions of the urinary tract).
Critical Results
N/A
Test Limitations
Results should always be assessed in conjunction with
patient’s medical history, clinical examination and other
findings.
Fee Code
30184540
Stability: Room Temp
7 days
Stability: Refrigerated
7 days
Stability: Frozen
1 year
Specimen Minimum Volume
0.2 mL
DAY(S) AND TIME(S) PERFORMED
24 hours, 7 days a week including holidays
STAT DAY(S) AND TIME(S) PERFORMED
Avaliable
CPT
84540
Method Name
Spectrophotometric, Kinetic
Reference Values
7 – 20 mg/dL
Reject Due To
Whole blood/unspun samples greater than 6 hours will be
rejected.
Synonyms
N/A
Additional Information
N/A
Included in Additional codes
N/A
Coverage Information
N/A