Parathyroid Hormone Intact

Abbrev Code:PTHI   
Order Code:LAB108Order Name:Parathormone Intact
Synonyms:Parathormone; PTHI; PTH, Intact; Parathyroid Hormone N Terminal
Methodology:Roche: Electrochemiluminescence immunoassay (ECLIA)
Vista: Chemiluminescent immunoassay
CPT Codes: 83970 x1, 83970 x1
Turnaround Time:Performed and reported 24 hours/day.
Associated Links:

Roche Go Live Schedule

Collection Instructions

Optimal Volume:3 mL
Minimum\Peds Volume:1 mL
Collection Instructions:Chemistry Tests Containers Chart
Causes for Rejection:Moderate hemolysis; frozen plasma; whole blood EDTA not processed within 24 hours. Sample collected in pediatric EDTA MAP tube.
Contraindications:Large doses of biotin (10 mg or more per day) may cause clinically significant interference in PTHI levels. If interference is suspected, it is strongly recommended that biotin is discontinued for at least one week prior to retesting.

Processing and Shipping

Specimen Processing:Process within 24 hours; 2 hours preferred. Centrifuge and aliquot 1.5 mL, 0.4 mL minimum. Store plasma refrigerated; do not freeze.
Serum is not recommended, but accepted if separated from cells within 2 hours of collection and assayed within 8 hours of collection or frozen. See Stability.
Shipping Instructions:Ship plasma at refrigerated temperature to arrive within 72 hours of collection for lithium heparin plasma, or 14 days for EDTA plasma. Ship serum on dry ice.
Stability:EDTA plasma: 25 hours at room temperature; 14 days refrigerated. Do not freeze.
Lithium heparin plasma: 9 hours at room temperature; 72 hours refrigerated. Do not freeze.
Serum: 8 hours at room temperature or refrigerated; 1 month frozen.
Test Performed at or Referral Lab Chemistry  (Grand Itasca, Roche-CSC Mpls, Roche-UMMC East, Southdale)


Reference Range:CSC: 15-65 pg/mL
Roche: 15-65 pg/mL
Grand Itasca: 12-88 pg/mL

Asian 8.7-79.6 pg/mL
Caucasian 12-64 pg/mL
Other races Normal range is not specified
Use:Used for evaluation of hypercalcemia.

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