Sign in →

Test 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