Urea Nitrogen, Body Fluid
Use
The Urea Nitrogen, Body Fluid test is useful for identifying the presence of urine as a cause for accumulation of fluid in a body compartment and for assessing the adequacy of peritoneal dialysis treatment protocols. Byproducts of nitrogen metabolism, such as urea, are present in high concentrations in urine and can be measured to diagnose urine leakage into body compartments, potentially indicating urinary tract disruptions.
Special Instructions
It is necessary to provide the date and time of collection, as well as the specimen source. If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request form with the specimen.
Limitations
In rare cases, conditions like gammopathy (especially type IgM as in Waldenstrom macroglobulinemia) may lead to unreliable results. Ammonium ions can cause falsely elevated results. The test's accuracy relies on proper specimen collection and handling, making certain types of specimens unacceptable.
New York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 3093-2
- 3093-2
- 14725-6
Result Turnaround Time
1-2 days
Related Documents
For more information, please review the documents below
Specimen
Body Fluid
Volume
1 mL
Minimum Volume
0.5 mL
Container
Sterile container; submission in plastic vial
Collection Instructions
Centrifuge to remove any cellular material and transfer into a plastic vial. Indicate the specimen source and source location on label.
Causes for Rejection
Gross hemolysis, gross lipemia, gross icterus, and specified body fluids including cerebrospinal fluid, breast milk, saliva, nasal secretions, gastric secretions, bronchoalveolar lavage (BAL) or bronchial washings, colostomy/ostomy, feces, urine, sputum, vitreous fluid
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 24 hours |
| Refrigerated | 7 days |
| Frozen | 30 days |