Parathyroid Hormone (PTH) (1136)

Create a Free Account to View Prices

CPT Code:


Test Type: 1.0 mL Serum Kit based
Stability Time:


Refrigerated: 2 days

Reference Range:
  • Low: <15 pg/dL
  • Normal: 15-65 pg/dL
  • High: >65 pg/dL


PTH is a hormone secreted by the parathyroid glands that is important in bone remodeling. PTH functions as part of a feedback system that involves calcium, phosphorus (as phosphate), and vitamin D.


Electrochemiluminescence Immunoassay (ECLIA)


  • Used to help diagnose the cause of a low or high calcium level and to help distinguish between parathyroid-related and non-parathyroid-related causes.
  • A calcium test is almost always ordered along with PTH to determine the balance between calcium and PTH and the response of the parathyroid glands to changing levels of calcium.
  • Most often ordered when calcium regulation is abnormal.
  • High doses of biotin (> 5 mg/day) may interfere with assay results. Patient assumed to be refraining from biotin supplementation for at least 3 days prior to blood draw.

Collection Details:

Collection Instructions:

Preferred Specimen

1.0 mL serum (0.5 mL minimum) collected in serum separator tube (SST/Tiger Top)

Transport Temperature

Refrigerated (ship on frozen cold packs)


Refrigerated: 2 days