Test Code UUN24 Urea Nitrogen Urine, Timed LAB449
Test Method
Enzymatic-Conductivity Rate Method; Beckman DXC600
Performance
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.