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Calcium 24-Hr Urine
Test CodeUCA24HR
Alias/See Also
CAUT24H
Urinary Ca+2
Urinary Ca+2
CPT Codes
82340
Preferred Specimen
24-hour urine specimens, use no preservatives. Refrigerate specimen during collection.
Instructions
Adjust to pH <3 after collection, prior to testing using 6N HCl.
Transport Temperature
Room temperature
Specimen Stability
Room yemperature: Urine 2 days at 15 - 25°C
Refrigerated: Urine 4 days at 2 - 8°C
Frozen: Urine 3 weeks at -20°C
Refrigerated: Urine 4 days at 2 - 8°C
Frozen: Urine 3 weeks at -20°C
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Samples not labeled with complete first and last name of patient and date of birth.
Methodology
Photometric
Setup Schedule
Sun - Sat
Report Available
Same day
Reference Range
100 – 300 mg/24 hr (24 hr urine)
Clinical Significance
Calcium is the most abundant mineral element in the body with about 99 percent in the bones primarily as hydroxyapatite. The remaining calcium is distributed between the various tissues and the extracellular fluids where it performs a vital role for many life sustaining processes. Among the extra skeletal functions of calcium are involvement in blood coagulation, neuromuscular conduction, excitability of skeletal and cardiac muscle, enzyme activation, and the preservation of cell membrane integrity and permeability. Serum calcium levels and hence the body content are controlled by parathyroid hormone (PTH), calcitonin, and vitamin D. An imbalance in any of these modulators leads to alterations of the body and serum calcium levels. Increases in serum PTH or vitamin D are usually associated with hypercalcemia. Increased serum calcium levels may also be observed in multiple myeloma and other neoplastic diseases. Hypocalcemia may be observed e.g. in hypoparathyroidism, nephrosis, and pancreatitis.
Performing Laboratory
Frederick Health Laboratory
400 W 7th Street
Frederick, MD 20701
Last Updated: May 15, 2020
