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PARATHYROID HORMONE, INTACT WITH CALCIUM
MessageSample types MUST be consistent between draws! For this reason, and due to other sample type stability, serum will no longer be accepted as an alternate sample type for Parathyroid Hormone testing.
- Plasma must be separated from cells within two hours of collection.
- Transfer plasma into a transfer tube.
- Specimens received uncentrifuged will be rejected.
Test Code
PTHCA
CPT Codes
83970; 82310
Includes
Test includes Parathyroid Hormone and Calcium
Preferred Specimen
Two tubes are needed for this test
- 1 Green tube (Lithium Heparin) for the Parathyroid Hormone
- 1 Gold tube (serum separator) for the Calcium
Minimum Volume
0.5 mL for each tube
Other Acceptable Specimens
None
Instructions
Centrifuge immediately for complete separation of plasma and red cells within 2 hours of collection. If gel-separator heparin tube is not used, aliquot (transfer) plasma into a transfer tube and refrigerate until tested. Allow gold tube to clot then centrifuge to separate serum from cells.
Transport Temperature
Refrigerate
Specimen Stability
- 2-8°C up to 2 days
- 15-30°C up to 8 hours
- Frozen up to 6 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolyzed
Methodology
Chemilluminescent assay
Setup Schedule
M, T, W, Th, F, Sa, Sun
Report Available
Within 24 hours of receipt at the performing laboratory.
Reference Range
- 12 - 88 pg/mL PTH
- 8.6 - 10.3 mg/dL Calcium
Clinical Significance
The function of PTH is to increase the serum concentration of calcium and decrease that of phosphate. The assay is useful in making the diagnosis of primary hyperparathyroidism, secondary hyperparathyroidism, and a differential diagnosis of hypercalcemia.
Performed By
Alverno Laboratories
Performing Laboratory
Alverno Central Lab
NCHB2 (Chemistry, Beckman DxI)
NCHB1 (Chemistry, Beckman AU)
Last Updated: August 19, 2023
