Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

Test Name: Sunquest Test Code Epic Procedure Code Or ID CPT Code:  

UREA NITROGEN, 24 HR

ORDERING INFORMATION:
Sunquest Test Code:
UN24      Geisinger Epic Procedure Code: 84540         Geisinger Epic ID: 7047

SPECIMEN COLLECTION
Specimen type:
24-hour urine
Preferred collection container:
Specimen required:
5 mL aliquot of urine; minimum 1 mL.
Special notes:
Preferred specimen container is the 24-hour urine container with NO preservative. Mix well. Estimate total collection volume from 24-hour urine container. Remove required aliquot. Record total volume on both aliquot tube and request slip (if applicable).
Patient preparation:
Patient should not be taking excessive amounts of vitamin C as vitamin C will interfere with test.

SPECIMEN PROCESSING
Transport temperature:
Refrigerated (preferred). Room temperature or frozen specimen also acceptable.
Specimen stability:
Room temperature: 2 days. Refrigerated: 7 days. Frozen: 4 weeks.
Rejection criteria:
Stability limits exceeded. Urine containing preservatives is unacceptable.

TEST DETAILS
Reference interval:
12.000-20.000 gm/24 hours.
CPT code(s):
84540
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Urea nitrogen 24, 24-hour urine, 24-hour total volume.
Methodology:
Spectrophotometric (Colorimetric)
Clinical significance:
About 80% of urinary nitrogen is in the form of urea, which is the major end product of protein metabolism. Urea excreted in the urine is the primary method of nitrogen elimination; therefore, this test provides an approximate evaluation of nitrogen balance. Conditions associated with increased urea nitrogen are hypothyroidism, high-protein diets, and postoperative states. Decreased levels are associated with convalescence, liver disease, toxemia, and advanced renal disease.
Doctoral Director(s:)
Hoi-Ying Elsie Yu, PhD, DABCC
Sheng-Ying (Margaret) Lo, PhD, DABCC    
Review Date: 11/05/2018

Performing Locations

Geisinger Medical Center

Performing laboratory: Automated Chemistry
Technical Lead: Mariana Moyer, Jared Shepherd
Frequency: Daily, Monday - Sunday
Performed stat? No
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