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Order Code CH156
Turnaround Time 24 hours
Test Includes


Specimen Requirements
Specimen Source
Serum, Plasma
Transport Container
(Specimen Container)

SST (Tiger Top) Lithium Heparin/ Sodium Heparin/ Potassium EDTA

Preferred Specimens
Minimum Volume (uL)
.5 mL
Collection Instructions
(Transport Temperature)
Transport Refrigerated (cold packs)
Specimen Stability
Temperature Period
Room temperature Unacceptable
Refrigerated 7 days
Frozen 6 months
Special Instructions

Use of Serum Separator may result in a decrease in concentration values of up to 20% when compared with serum collected in serum tubes without additive.

Test Details
chemiluminescent microparticle immunoassay (CMIA) technology
Clinical Significance

The Alinity i Intact PTH assay is a chemiluminescent microparticle immunoassay (CMIA) used for the quantitative determination of intact parathyroid hormone (PTH) in human serum and plasma on the Alinity i analyzer.

PTH is a single chain polypeptide of 84 amino acids produced by the parathyroid gland. Intact PTH1-84 is secreted into the blood stream and undergoes extensive proteolytic modifications. In contrast to its degradation products, the concentration of intact PTH is relatively independent of glomerular filtration rate and reflects the biologically active portion of the hormone.

The primary role of PTH is to regulate the blood calcium level. PTH synthesis and secretion are stimulated within a few minutes by low concentrations of ionized calcium (Cai). The biological activity of PTH is to increase absorption of dietary calcium, decrease renal clearance and mobilize skeletal calcium stores. Abnormally high Cai concentrations suppress secretion of PTH.

In conjunction with serum calcium levels, the Alinity i Intact PTH assay may be used as an aid in the differential diagnosis of hypercalcemia, hypocalcemia and parathyroid disorders. PTH determination is important in monitoring dialysis patients to manage renal osteodystrophy.

Reference Ranges

20.0 – 125.0 pg/mL

Alternative Names
Intact Parathyroid Hormone