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PTH, Intact and Calcium

Test Code


CPT Code(s)

82310, 83970


The Intact PTH is the recommended initial assay for the differential diagnosis of calcium-related abnormalities

Preferred Specimen(s)

2 mL frozen serum collected in a SST® (red-top) tube

Minimum Volume

1 mL

Collection Instructions

Spin to separate serum and transfer to plastic screw-cap vial. Freeze immediately and submit to laboratory frozen. Do not submit glass tubes.

Transport Temperature


Specimen Stability

Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 6 months

Reject Criteria

Gross hemolysis • Plasma • Intact PTH specimens received room temperature or refrigerated


PTH: Immunoassay (IA) • Calcium: Spectrophotometry (SP)

Performing Laboratory

Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92675-2042

Setup Schedule

Set up: Tues-Sat; Report available: 1-2 days

Reference Range(s)


Age 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
Parathyroid Hormone, Intact
<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 14-64 pg/mL
Interpretive Guide
  Intact PTH Calcium 
Normal Parathyroid Normal Normal
Hypoparathyroidism Low or Low Normal Low
  Primary Normal or High High
  Secondary High Normal or Low
  Tertiary High High
  Hypercalcemia Low or Low Normal High

Clinical Significance

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.

Alternative Name(s)

Immunoreactive PTH, Sandwich PTH Assay, PTH Whole Molecule, Intact Hormone, Monogram

LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result NameLOINC CodeComponent Name
55191410Parathyroid Hormone,Intact2731-8Parathyrin.intact

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.