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To view specimen requirements and codes please select your laboratory:
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PTH, Intact and Calcium
2 mL serum collected in a SST® (red-top) tube
Spin to separate serum and transfer to plastic transport tube. Freeze immediately and submit to laboratory frozen. Do not submit glass tubes. Sodium or Lithium Heparin are no longer acceptable specimen types.
Room temperature: Unacceptable
Frozen: 4 months
Gross hemolysis • Gross lipemia • Gross icterus • Received room temperature • Received refrigerated • Plasma
PTH: Immunoassay (IA) • Calcium: Spectrophotometry (SP)
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92690-6130
Set up: 5 days a week a.m.; Report available: 2 days
|<6 Years||Not established|
|6-9 Years||9-59 pg/mL|
|10-13 Years||11-74 pg/mL|
|14-17 Years||9-69 pg/mL|
|>17 Years||10-65 pg/mL|
|Hypoparathyroidism||Low or Low Normal||Low|
|Primary||Normal or High||High|
|Secondary||High||Normal or Low|
|Hypercalcemia||Low or Low Normal||High|
The assay is useful in making the diagnosis of primary hyperparathyroidism, secondary hyperparathyroidism, and a differential diagnosis of hypercalcemia. The assay helps in distinguishing hypercalcemia cause by either primary hyperparathyroidism or malignant disease.
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.)
* 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.