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Urea Nitrogen, Urine, 24 Hour

Performing Lab(s)

Memorial-Belleville only

Specimen Requirement (s)

Specimen Type: urine

Container/Tube:   24 hour urine collection jug

Specimen Volume:   NA

Specimen Minimum Volume: 1 mL or urine

 

Collection Instructions:

  • Record start and stop times
  • Refrigerate while collecting

Lab instructions: NA

Day(s)/Shift(s) Test Set Up and Turnaround Time

Sunday through Saturday

Hours: 24 hours

 

Turnaround Time:

TAT: No

Routine: less than 8 hours from receipt

Transport and Stability

Transport temperature: Ambient to lab

Reference Values

5-20 g/24 hours (diet dependent)

 

Note: Calculation of nitrogen balance requires knowledge of 24-hour urea nitrogen and daily protein intake. Use the following formula: nitrogen balance=daily protein intake (g)/6.25-(24 hour urine urea nitrogen+3 or 4*).

*Use 4 if diarrhea is present.

Literature Reference:

Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6 th ed: Chapter 32, p. 479, Elsevier, St. Louis, MO 2018.

CPT/LOINC Codes

84540

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