Parathyroid Hormone (PTH)

Tube Type

Test ID		LAB704
EPIC ORDER		PARATHYROID HORMONE (PTH)
CPT Code(s)		83970 (PTH)
Group/Individual Test		Group
Laboratory		Core Laboratory
Tube Station		30
Specimen	Routine:	4 mL blood/green lithium heparin gel tube. Also acceptable gold SST or red plain tube
	Micro:	1 mL blood
Stability	Unspun:	2 hours
	Spun/Separated:	Room Temperature: 8 hours (serum or plasma) Refrigerated: 72 hours Plasma / 8 hours Serum Frozen: 4 weeks
Turnaround Time		2 hours
Reference Range	Serum:	18.5-88.1 pg/mL
	Plasma:	18.4-80.1 pg/mL
Comments	Reference Ranges effective 7/13/2021 For intraoperative PTH, schedule with lab and order Intra-operative PTH (LAB5350) Patient samples containing heterophilic antibodies may give falsely elevated or depressed values. PTH results from different assays cannot be interchanged. PTH results generated at the Medical Center use the Siemens Atellica IM PTH assay which is a two-site immunoassay using direct chemiluminescent technology. PTH results generated at the Ambulatory Care Center (ACC) (Intra-operative PTH) use the Tosoh A1A 360 PTH two-site immunoenzymometric assay.

Reviewed by J. Carr on January 05, 2026

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514