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Test Name:
Uric Acid, Urine, 24-Hour


  • SBMF No:
    23266
  • Performance Lab Name:
    Automated Lab
  • Test Mnemonic:
    U URAC24
  • ABN:
    Not required
  • CPT Code:
    84560
  • LOINC Code:
    20624-3; 13362-9; 3167-4; 2162-6; 19150-2; 3087-4; 3086-6
  • Test Includes:
    Uric Acid
    Creatinine
  • Spec Type:
    Urine, 24-hour
  • Spec Container:
    Plastic container with tightly fitting lid (no preservative)
  • Pref Vol:
    20.0 mL aliquot from well-mixed 24-hour collection
    Note: Send urine aliquot with notation of entire 24-hour urine volume on aliquot label and on requisition
  • Min Vol:
    10.0 mL aliquot from well-mixed 24-hour collection
  • Fasting:
    No
  • Spec Collect:
    To begin collection of timed specimen, have patient urinate, noting date and exact time
    Discard this first portion of urine, but document date and time of voiding on container label and test requisition as "start" of timed specimen
    Save all urine voided during designated time period, including portion voided at exact end of time period
    IMPORTANT: Refrigerate entire specimen (2-8°C) during and after collection to prevent bacterial growth
    Document date and time of final voiding on label and requisition as "end" of timed specimen
  • Spec Process:
    Upon completion of collection, mix entire specimen well and measure 24-hour volume
    Pour off 20.0 mL of urine into separate plastic tube(s)
    Refrigerate urine aliquot and transport refrigerated
    Send urine aliquot with notation of entire 24-hour urine volume on aliquot label and on requisition
  • Spec Store Transport:
    Refrigerated
  • Spec Stability:
    48 hours room temperature (20-30°C)
    1 week refrigerated (2-8°C)
    1 month frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles
  • Spec Remarks:
    Note: 24-hour urine is optimal specimen for testing
  • Methodology:
    Photometric
  • Use:
    Increased levels of urinary uric acid are used to identify patients at risk regarding stone formation, genetic defects and nephrolithiasis, urinary excretions of uric acid, increases steadily until the 16th week of gestation
    After the 16th week the excretions of uric acid remains unchanged at approximately 40% above the non-pregnant level
  • Reference Range:
    0.3-1.0 g/24 hours (diet dependent)
  • Additional Test Info:
    Record total specimen volume, collection times, and pH [if required] on test requisition
  • Day Run:
    Sun-Sat (daily)
  • Time Run:
    As received
  • Time Reported:
    4 hours
  • Test Type:
    URINE

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