Sign in →

Test Code 24H UR UREA NITROGEN Urea Nitrogen, 24 Hour, Urine

Performing Laboratory

NRL-Chemistry

Methodology

Enzymatic Conductivity

 

Specimen Requirements

Specimen Type: Urine, 24-hour
Container/Tube: Plastic urine container

Specimen Volume: Entire collection

Collection Instructions:

1. No preservative.

2. Refrigerate specimen during collection.

Additional Information:

1. Starting and ending times of collection are required.

2. Follow instructions in Urine Collection in Special Instructions.

Reference Values

UREA NITROGEN, CALCULATED

5-20 g/24 hour (diet-dependent)
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.

Note: Results are calculated using total volume and length of collection and results are adjusted to units/24 hours.

Day(s) Test Set Up

Monday through Sunday

Turnaround Time:

Routine-daily

Specimen Transport Temperature

Refrigerate

Test Classification and CPT Coding

81050-Urine timed measurement

84540-Urea nitrogen

Special Instructions