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Test Code Billings Clinic: 4151 Calcium, 24 Hour, Urine

Performing Laboratory

Billings Clinic Laboratory: Chemistry

Useful For

Identification of abnormal physiologic states causing excess or suppressed excretion of calcium, such as hyperparathyroidism, vitamin D abnormality, diseases that destroy bone, prostate cancer, and drug treatment, such as thiazide therapy

Methodology

O-cresolphthalein complexone (OCPC)

Specimen Requirements

  • Urine specimens should be collected in a bottle containing 10 mL of 6 M HCl per 24-hour specimen to prevent calcium salt precipitation.
  • Refrigerate specimen during collection, and send specimen refrigerated.
  • 24-Hour volume is required on request form for processing.
  • 10 mL from a 24-hour urine collection in a urine container. 
  • Follow instructions in “Urine Collection” under "Resources"

Storage/Stability

Specimen Type Temperature Time
Urine Refrigerated (preferred) 4 days
  Frozen 3 weeks
  Ambient 2 days

 

Reference Values

42 - 353 mg/24 hours

Day(s) Test Set Up

Daily

Test Classification and CPT Coding

82340 - Calcium; urine quantitative, timed specimen

LOINC Code Information

Reporting Name LOINC Code
Calcium, Ur, 24 hr 6874-2