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Test Code LAB841 Uric Acid - 24 Hour Urine

Performing Laboratory

Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center

Specimen Minimum Volume

1.0 mL of a well mixed 24 hour specimen

Billing Code

2051308

Methodology

Uricase 

Specimen Requirements

24 Hour urine container. To prevent urate precipitation in urine specimens, after specimen collection, add a sufficient volume of sodium hydroxide solution to bring the pH between 8 and 9. Store samples at room temperature. Uric acid in urine is usually stable for approximately 3 days at room temperature 15°-25°C, provided that there is no bacterial growth to destroy it.

24 Hour Urine Container Instructions

 

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 room temp during entire collection. Screw lid on securely.

Day(s) Test Set Up

Monday through Sunday 

Test Classification and CPT Coding

84560  -  Uric acid; other source 

Additional Information

Elevated in gout.  Look for hyperuricosuria in patients with renal calculus formation, identification of genetic defects, influence of overexcretion on therapy of gout. Decreased in lead toxicity and folic acid deficiency.

Specimen Transport Temperature and Stability

Keep at room temperature during collection

Send to laboratory immediately upon completion of collection

Performing Department

Chemistry

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