Calcium

Test Code

303

CPT Codes
82310

Preferred Specimen

1 mL serum

Minimum Volume

0.5 mL

Other Acceptable Specimens

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

Transport 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 (Eg, hemolysis? Lipemia? Thaw/Other?)

Anticoagulants other than heparin

Methodology
Spectrophotometry (SP)

Setup Schedule

Daily

Report Available

1 day

Reference Range

	Male (mg/dL)	Female (mg/dL)
<1 month:	8.4-10.6	8.4-10.6
1-11 months:	8.7-10.5	8.7-10.5
1-3 years:	8.5-10.6	8.5-10.6
4-19 years:	8.9-10.4	8.9-10.4
20-49 years:	8.6-10.3	8.6-10.2
>49 years:	8.6-10.3	8.6-10.4

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.

Performing Laboratory

Quest Diagnostics-Seattle

1737 Airport Way S Suite 200

Seattle, WA 98134-1636

Last Updated: November 6, 2024

The CPT Codes provided in this document 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 payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.