Parathyroid Hormone Intact - UMMC East


Sunquest Code:PTHI  
Epic Code:LAB108Epic Name:Parathormone Intact
Synonyms:Parathormone; PTHI; PTH, Intact; Parathyroid Hormone N Terminal
Methodology:Chemiluminescent immunoassay
Turnaround Time:Performed and reported 24 hours/day.


Collection Instructions

Specimen:Blood
Optimal Volume:3 mL
Minimum\Peds Volume:1 mL
Container:Purple (EDTA) (Green (lithium heparin, gel), Red (no gel), Red or gold (gel))
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  (UMMC-East Bank)


Interpretive

Reference Range:18-80 pg/mL
Use:Used for evaluation of hypercalcemia.


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