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Test Code Billings Clinic: 4737 Parathyroid Hormone (PTH) Intact, Serum

Important Note

Results from patients taking biotin supplements or receiving high-dose biotin therapy should be interpreted with caution due to possible interference with this test.

Performing Laboratory

Billings Clinic Laboratory: Chemistry

Methodology

Chemiluminescent Immunoassay: PTH

O-Cresolphthalein Complexone (OCPC): Calcium

Creatininase / Modified Jaffe method

Phosphomolybdate UV / bichromatic endpoint: Phosphorus

Specimen Requirements

  • Draw blood in a plain, red-top tube(s) or a serum gel tube(s). 
  • Spin down
  • Send 1 mL of serum frozen in plastic vial.

Storage/Stability

Specimen Type Temperature Time
Serum Refrigerated 8 hours
  Frozen (preferred) 1 month
  Ambient 8 hours

 

Reject Due To

  • Specimens other than serum
  • Gross hemolysis

 

Reference Values

See individual test listings

Day(s) Test Set Up

Daily

Test Classification and CPT Coding

82310 - calcium

82565 - creatinine

83970 - PTH

84100 - phosphorus

LOINC Code Information

Reporting Name LOINC Code
PTH, Intact 2731-8
Calcium 17861-6
Creatinine 2160-0
Phosphorus 2777-1