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Test Code UCA24 Calcium, 24 Hour, Urine

Additional Codes

Epic: LAB814

Specimen Required

Specimen Type: Preserved Urine

Collection Container/Type

Preferred: 24-hour urine container

Submission Container/Tube: Clear top (no additive)

Specimen Volume: 3 mL

Collection Instructions: 

  1. Add 6N HCL at the start of collection.
  2. Collect urine for 24 hours.
  3. 24-hour volume is required.
  4. Start and completion date and time is required.

Specimen Minimum Volume

0.5 mL

Specimen Stability

Room temperature: 2 days

Refrigerated: 4 days

Frozen: 3 weeks

Reference Range

100 - 300 mg/24 hours

Rejection Due To

Unlabeled, mislabeled, wrong tube type, QNS, exceeds specimen stability requirements.

Report Available

Same day

Clinical Significance

Calcium ions in serum decrease neuromuscular excitability, participate in blood coagulation, and activate enzymes. As part of the BMP and CMP, abnormal calcium levels lead to other underlying causes. Hypercalcemia may be seen in cancer-especially bone cancer, kidney transplant, tuberculosis, and in hyperthyroid states. Long-term lithium therapy may cause hyperparathyroidism with resulting hypercalcemia. Hypocalcemia can be seen in malabsorption, alcoholism, hypoproteinemia, hypoparathyroidism, and acute pancreatitis. Low dietary intake of calcium, vitamin D deficiency may be other causes.

Method Name

Arsenazo III Dye

Day(s) Performed


Special Instructions

Patient Collection Instructions