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Test Code CA Calcium

Additional Codes

Epic: LAB53

Specimen Required

Collection Container/Type

Preferred: Serum gel

Acceptable: Green top (Lithium heparin)

Submission Container/Tube: Plastic vial

Specimen Volume: 3 mL

Collection Instructions: Centrifuge and separate cells after clot formation and within 4 hours of collection. 

Specimen Minimum Volume

0.10 mL

Specimen Stability

Room temperature 7 days

Refrigerated 3 weeks

Frozen 8 months

Reference Range

0 - 10 days: 7.6 - 10.4 mg/dL

10 days - 2 years: 9.0 - 11.0 mg/dL

2 - 19 years: 8.8 - 10.8 mg/dL

19 - 70 years: 8.5 - 10.5 mg/dL

70 - 150 years: 7.9 - 10.2 mg/dL



0 - 28 days: 9.0 - 11.0 mg/dL

Rejection Due To

Unlabeled, mislabeled, wrong tube type, QNS, hemolyzed.

Report Available

Same day

Clinical Significance

The majority of calcium in the body is present in bones.  The remainder of the calcium is in serum and has various functions.  For example, calcium ions decrease neuromuscular excitability, participate in blood coagulation, and activate some 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, hypervitaminosis D, kidney transplant, multiple myeloma, tuberculosis, and in hyperparathyroidism.  Long-term lithium therapy may cause hyperparathyroidism, with resulting hypercalcemia.

Hypocalcemia can be seen in malabsorption, alcoholism, hypoalbuminemia, hypoparathyroidism, renal insufficiency and acute pancreatitis.  Low dietary intake of calcium, vitamin D deficiency, may be other causes.

Method Name

Arsenazo III


For serum, hemolysis increase results by up to 4%.  Bilirubin may decrease results by 2%.  Intralipid can increase results by up to 6%.

Interferences from medications or endogenous substances may affect results.



Day(s) Performed