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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: PTH

Test Code(s): PTHIN / HCPTHIN

CPT Code(s): 83970

Methodology: Chemiluminescent Immunoassay

Days Performed: Mon-Fri, dayshift.

Turnaround Time: Routine: Next working day.

Specimen Requirements

Specimen: Blood

Collection Container: Preferred: Lavender top

Collection Volume: Preferred: 4 mL
Pediatrics: 1 mL

Sample Analyzed: Plasma

Volume Required: Preferred: 1 mL
Pediatrics: 0.4 mL

Specimen Processing: Centrifuge immediately. Transfer cell-free plasma to plastic screw cap vial. Refrigerate.

Specimen Transport: Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location.

Stability: Ambient: 3 hours (whole blood), 8 hours (plasma)
Refrigerated: 3 days
Frozen: 8 months


Reference Interval:

18 years and up:  14-72 pg/mL

Test Limitations:

Results may be affected if patient has developed heterophilic antibodies due to exposure to animal based protein products.

High dose biotin therapy may falsely depress results.

Additional Information:

No hook dose effect up to 100,000 pg/mL.

PTH-Intact Hormone-N Terminal
Parathyroid Hormone Intact Molecule

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