Calcium (Ca)

CPT: 82310

Expected Turnaround Time

24 Hours

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Specimen Requirements

Specimen

Serum, Plasma

Volume

5 ml

Minimum Volume

4 ul

Container

SST (Serum), Red Top (Separate Serum), Lithium Heparin (Plasma)

Storage Instructions

Room Temp., Refrigerated (2-8 C)

Stability Requirements

Room temp. 7 days, Refrigerated 7 days

Causes for Rejection

Mislabeled specimen, grossly hemolyzed specimen, sample collected expired tubes, clotted specimen

Test Details

Use

This test is use in the quantitative determination of calcium in human serum, plasma (lithium heparin), and urine.

Methodology

Colorimetric

Reference Interval

Adults, 8.7–10.4 mg/dL for serum/ plasma and 100–300 mg/day for urine

Critical Value Range

Calcium <6.0 and ≥13.0

Additional Information

Calcium is a vital electrolyte involved in numerous physiological processes, including neuromuscular function, cardiac conduction, vascular contraction, enzymatic activity, and bone metabolism. Serum calcium exists in three forms: ionized (biologically active), protein-bound (mainly to albumin), and complexed with anions. Total serum calcium is commonly measured, but ionized calcium provides a more accurate reflection of physiologically active calcium, especially in critically ill patients or those with abnormal albumin levels. Clinically, calcium testing is used to evaluate parathyroid function, diagnose hypercalcemia or hypocalcemia, and monitor conditions such as chronic kidney disease, malignancy, and vitamin D disorders. Elevated calcium may be associated with primary hyperparathyroidism or malignancy, whereas low levels can result from hypoparathyroidism, vitamin D deficiency, or renal insufficiency.

References:

  • Carroll, M. F., & Schade, D. S. (2003). A practical approach to hypercalcemia. American Family Physician, 67(9), 1959–1966.

  • Peacock, M. (2010). Calcium metabolism in health and disease. Clinical Journal of the American Society of Nephrology, 5(Suppl 1), S23–S30. https://doi.org/10.2215/CJN.05910809

Footnotes

Statement on Medical Necessity
All ordered tests should be medically necessary for the diagnosis or detection of disease, illness, impairment, symptom, syndrome, or disorder and the results should be used in the medical management and treatment decisions for the patient. Solaris requires ICD-10 codes with each order for lab testing and both the tests ordered and the diagnosis should be documented in the provider’s medical record for the patient. The United States Department of Health and Human Services, Office of Inspector General, takes the position that a provider who orders medically unnecessary tests may be subject to civil penalties.

Panels and Profiles
Solaris offers Providers the convenience of ordering test combinations in a group at times with the flexibility to choose appropriate test(s) for individual patients. Providers should only order those tests that he or she believes are medically necessary for each patient, and a lesser inclusive profile or individual tests should be ordered if not all tests in the test combination/profile are medically necessary. All tests offered in a test combination/profile may be ordered separately as individual tests. Solaris encourages clients to contact their Solaris representative if the testing configurations shown do not meet individual needs for any reason, or if some other combination of procedures is needed.

CPT Codes
CPT Codes listed are in accordance with Current Procedural Terminology, a publication of the American Medical Association. CPT codes are the responsibility of the billing party and are listed here for informational purposes. Correct coding may vary from one carrier to another. Solaris may bill specific carriers using codes other than what is shown.

Questions?

For questions or inquiries related to testing please reach out to
customerservice@solarisdx.com or contact us by phone at (844) 550-0308.