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Test Code U24UN/LAB5205 Urea Nitrogen - 24 Hour Urine

Performing Laboratory

Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center

Specimen Requirements

24 hour urine, 24 hour urine container with no preservative

24 Hour Urine Container Instructions

24 Hour Urine Container with no preservatives


Container MUST  be labeled with: Office Location, Patient’s First and Last Name and Date of Birth


Instruct patient:

  • To label container with Date and time collection started, Date and time collection finished. 
  • Void and DISCARD the first-morning specimen and to record exact time of voiding.
  • Patient should collect all subsequent voided urine for remainder of day and night.
  • Collect first-morning specimen on day 2 at same time as noted on day 1.
  • Collection is complete.
  • Keep urine refrigerated during entire collection. Screw lid on securely.

Specimen Transport Temperature and Stability

Refrigerate: 2-8° C 
Assay should be performed within 2 hours of completion

Specimen Minimum Volume

1.0 mL of a well mixed 24 hour specimen

Reasons for Rejection

Lacking collection date

Lacking collection beginning and ending times

Lack of Two Patient Identifiers:

         1-Patient's First & Last name 

         2-Patient's Date of Birth

Day(s) Test Set Up

Monday through Sunday 

Additional Information

Urine urea nitrogen is increased in hyperthyroidism, post-operatively and with increased dietary protein.  It is
decreased in normal growing children and infants, pregnancy, low protein, high carbohydrate diets, renal damage and insufficiency from any cause.


Coupled Urease 

Performing Department


Test Classification and CPT Coding

84540  -  Urea nitrogen, urine

Billing Code