Nitrogen (Total), Urine
General Information
- Lab Name
- Nitrogen (Total), URN
- Lab Code
- UTNIT
- Epic Ordering
- Nitrogen, Total, Urine
- Description
Chemically-bound nitrogen is oxidized to nitric oxide at high temperature in a pyrotube and converted to nitrogen dioxide by ozone. A specific chemiluminescent emission from nitrogen dioxide is detected by PAC ElemeNts analyzers. Quantitative results are reported between 5 to 36,000 mg/L. Assay imprecision is less than 10%.
- Synonyms
- Total Urinary Nitrogen, TUN, Urea Nitrogen
- Components
-
Code Name TNIINT Interval TNITV Total Volume TNIPU Nitrogen (Total) TNIPV Nitrogen (Total) UTNITM Nitrogen (Total) Method, URN
Interpretation
- Method
Pyro-chemiluminescence
- Reference Range
- See individual components
Ordering & Collection
- Specimen Type
- Urine
- Collection
-
12 HOUR, 24 HOUR or TIMED URINE per physician order
- Handling Instructions
Refrigerate urine during collection.
- Quantity
-
requested: 10 mL urine
minimum: 2 mL urine
Processing
- Processing
Measure & Record Total Volume of timed specimens. Refrigerate urine
Note: May be collected with acetic acid in collection container (Few grains thymol-ok, however it is NOT RECOMMENDED. The thymol is a carry over from UUNs.)
Stability: Refrigerator: 1 week; -20°C Freezer: 1 month
Performance
- LIS Dept Code
- Chemistry, Harborview (CHH)
- Performing Location(s)
-
HMC Chemistry, Special
206-520-4600325 9th Ave, Rm # GWH-47, Seattle, WA 98104-2420
- Frequency
- Monday, Thursday, specimen in lab by 11am will be run same day.Test will be run on Tuesday after a Monday holiday
- Available STAT?
- No
Billing & Coding
- CPT codes
- 82397
- LOINC
- 3095-7