PARATHYROID HORMONE, INTACT

Test Code

PTH (OE), PTHI (LAB)

CPT Codes
83970

Preferred Specimen

1 Green tube (Lithium Heparin)

Patient Preparation
Note: patient should be tested with the same sample type in order to get consistent PTH results over time.

Minimum Volume

0.5 mL (1 mL optimal)

Other Acceptable Specimens

1 Gold tube (SST)

OR

1 Red tube

Instructions

Centrifuge immediately for complete separation of plasma or serum from red cells within 2 hours of collection. Aliquot plasma or serum into a transfer tube and refrigerate until tested.

Note: Serum samples must be tested within 8 hours of collection.

Transport Container

Transfer tube

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
Specimens received uncentrifuged

Methodology
Chemiluminescent immunoassay

Setup Schedule

M, T, W, Th, F, Sa, Su

As received; STAT testing not available

Report Available

Same day received

Reference Range

12 - 88 pg/mL

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 hyperparthyroidism, secondary hyperparathyroidism, and a differential diagnosis of hypercalcemia.

Performing Laboratory
Alverno Central Lab

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.