Laboratory Services

Parathyroid Hormone, Intact, with Calcium

Updated Test Information:

Test Description

Synonym(s)

PTH, Intact, with Calcium

Test ID

PTHCA

General Information

Preferred collection: SST - Separate serum from cells within 45 minutes of collection and shipped refrigerated

Container Type

PTH: SST, Lavender Top Tube (K2EDTA or K3EDTA)
CA: SST, or GTT (heparin)

Specimen Type

PTH: serum or EDTA plasma
CA: serum or heparinized plasma

Specimen Requirements

PTH: SST or Lavender Top Tube
CA: SST, or GTT

Alternate Specimen Type

Red, K2EDTA, K3EDTA

Specimen Collection / Processing Instructions

PREFERRED: SST - Must be centrifuged within 45 minutes of collection. PTH ALTERNATE: EDTA-centrifuge and aliquote within 45 minutes of collection- if EDTA is UNSPUN must be transported at room temperature and received within 24 hours of collection. CA ALTERNATE: Green Top Tube - centrifuge and aliquot within 45 minutes of collection

Minimum Sample Volume

1 mL

Pediatric Min. Volume (if applicable)

500 uL

Stability

PTH: Serum: 2 days at 2‑8 °C or 6 months at -20 °C
Plasma: 2 days at 15‑25 °C, 3 days at 2‑8 °C, or 6 months at -20 °C
Unspun EDTA: 24 hours at 15‑25 °C
CA: 7 days at 15-25 ˚C or 3 weeks at 2-8 ˚C

Unacceptable Specimen Conditions

PTH: Red top tubes, serum tubes without serum separators, unspun EDTA >24 hours after collection, unspun EDTA shipped refrigerated. CA: Gross hemolysis, EDTA, oxalate, or citrate anticoagulant

Methodology

Electrochemiluminescence immunoassay ECLIA

Estimated TAT

0-2 days

Testing Schedule

Monday-Saturday

CPT Code(s)

83970
82310

Reference Range

	Intact PTH (pg/mL)	Calcium (mg/dL)
Normal	15 - 65	8.6 - 10.2
Primary Hyperparathyroidism	>65	>10.2
Secondary Hyperparathyroidism	>65	<10.2
Non-Parathyroid Hypercalcemia	<65	>10.2
Hypoparathyroidism	<15	< 8.6
Non-Parathyroid Hypocalcemia	15 - 65	< 8.6

Performing Lab

Incyte Diagnostics

LOINC Code(s)

2731-8