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Test Name:
Calcium, Urine, 24-Hour


  • SBMF No:
    23427
  • Performance Lab Name:
    Automated Lab
  • Test Mnemonic:
    U CA24
  • ABN:
    Not required
  • CPT Code:
    82340
  • LOINC Code:
    17862-4; 6874-2; 13362-9; 3167-4; 20624-3; 2162-6; 19150-2
  • Test Includes:
    Calcium
    Creatinine
  • Also See:
    23127 Calcium, Random Urine
  • 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 very 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)
    4 days refrigerated (2-8°C)
    3 weeks 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:
    Used in the diagnosis and treatment of parathyroid disease, a variety of bone diseases, chronic renal disease, and tetany (intermittent muscular contractions or spasms)
  • Clinical Significance:
    The main significance in determining urinary calcium lies in the differentiation between hypercalciuria and hypocalciuria and the differential diagnosis of nephrolithiasis.
  • Reference Range:
    50-400 mg/24 hours
  • Day Run:
    Sun-Sat (daily)
  • Time Run:
    As received
  • Time Reported:
    4 hours
  • Test Type:
    URINE

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