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Test Code


CPT Code(s)


Preferred Specimen(s)

1 mL serum

Minimum Volume

0.5 mL

Alternative Specimen(s)

Sodium heparin (green-top) tube • Lithium heparin (green-top) tube

Specimen Container

Serum Separator Tube (SST®)

Transport Temperature

Room temperature

Specimen Stability

Serum and Plasma
 Room temperature: 7 days
 Refrigerated: 7 days
 Frozen: 28 days

Reject Criteria

Hemolysis • Anticoagulants other than heparin


Spectrophotometry (SP)

Performing Laboratory

Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

Setup Schedule

Monday-Friday All Shifts Saturday Morning Sunday Morning, Night; Report available: Next Day

Reference Range(s)

<1 Month 8.4-10.6 mg/dL
1-11 Months 8.7-10.5 mg/dL
1-3 Years 8.5-10.6 mg/dL
4-19 Years 8.9-10.4 mg/dL
≥20 Years 8.6-10.2 mg/dL

Clinical Significance

Serum calcium is involved in the regulation of neuromuscular and enzyme activity, bone metabolism and blood coagulation. Calcium blood levels are controlled by a complex interaction of parathyroid hormone, vitamin D, calcitonin and adrenal cortical steroids. Calcium measurements are useful in the diagnosis of parathyroid disease, some bone disorders and chronic renal disease. A low level of calcium may result in tetany.

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.