Parathyroid Hormone (Intact)
Label Mnemonic: PTHP
Epic Lab Code: LAB108
Downtime Form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
Chemistry
6240 RCP
356-3527
Specimen(s):
Plasma
Collection Medium:
Pink top tube 6 mL (K2-EDTA)
Alternate Collection Media:
Call laboratory for additional acceptable specimen collection containers.
Minimum:
6 mL whole blood in pink top tube
Rejection Criteria:
Grossly hemolyzed or lipemic specimens
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
1 hour (upon receipt in laboratory)
Reference Range:
15-65 pg/mL
Comments:
This assay may be significantly impacted by high-dose biotin (>5 mg dose) taken within previous 12 hours. High concentrations of biotin may lead to falsely decreased results. These concentrations may be found in patients taking over-the-counter supplements with biotin content much higher than nutritional requirements for biotin. Specimens should not be collected until at least 12 hours after the last dose.
Test Limitations:
Hemolysis: No significant interference up to an H index of 250 (approximate hemoglobin concentration: 250 mg/dL).

Lipemia: No significant interference up to an L index of 1500 (approximate triglycerides concentration: 3000 mg/dL). Note there is poor correlation between turbidity and triglyceride concentration.

Icterus: No significant interference up to an I index of 65 (approximate conjugated and unconjugated bilirubin concentration: 65 mg/dL).
Methodology:
Electrochemiluminescence Immunoassay
CPT Code:
83970
 
See Additional Information:
Biotin Interference with Immunoassays