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Test Code UUN24 Urea Nitrogen Urine, Timed LAB449

Test Method

Enzymatic-Conductivity Rate Method; Beckman DXC600


Testing is performed Monday through Sunday.

Typically assayed within 2 hours after specimen
arrives at testing site.

Useful For

Assessment of protein intake and/or nitrogen balance

Specimen Requirement

0.5 mL urine is required.

CPT Code Information

84540 Chemistry: Urea Nitrogen; Urine

Reference Values

12 – 20 gm/24 hours

LOINC Code Information

12967-6 Urea Nitrogen [Mass/Volume] In 24 Hour Urine

Additional Specimen Collection Information

Collect a 24 hour urine specimen in a sterile
container. No preservative is required. Keep the specimen chilled
during the collection period. Label the specimen appropriately with
two identifiers, patient name and another identifier, (patient ID
number, DOB, etc.) include specimen source, date and time of
collection. Record the collection time period on the
label and specimen container. Store the urine specimen refrigerated
and transport to the lab within 48 hours.