Test Details
Mnemonic
PTH
Ordering Code
1010400
CPT-4 Code(s)
83970
Specimen Information
Collect
Lavender EDTA
Specimen Preparation
Centrifuge, separate plasma from cells and send 1.5 mL plasma in a screw capped plastic vial. Label as PLASMA.
Alternate Specimen
Serum: 2.0 mL serum (1.0 mL minimum) frozen
Minimum Volume
1.0 mL
Transport Temperature
Frozen
Rejection Criteria
Gross hemolysis, plasma in green sodium or lithium heparin tubes
Stability
Plasma:
Room temperature: 48 hours
Refrigerated: 72 hours
Frozen: 6 months
Serum:
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 6 months
Room temperature: 48 hours
Refrigerated: 72 hours
Frozen: 6 months
Serum:
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 6 months
Methodology
Immunoassay
Reference Range
Parathyroid Hormone, Intact
<1 Year 7 - 58 pg/mL
1-7 Years 12 - 55 pg/mL
8-18 Years 12 - 71 pg/mL
≥19 Years 14 - 64 pg/mL
Interpretive Guide
Intact
Normal Parathyroid Normal
Hypoparathyroidism Low or Low Normal
Hyperparathyroidism
Primary Normal or High
Secondary High
Tertiary High
Non-Parathyroid
Hypercalcemia Low or Low Normal
PTH Calcium
Normal Parathyroid Normal
Hypoparathyroidism Low
Hyperparathyroidism
Primary High
Secondary Normal or Low
Tertiary High
Non-Parathyroid
Hypercalcemia High
<1 Year 7 - 58 pg/mL
1-7 Years 12 - 55 pg/mL
8-18 Years 12 - 71 pg/mL
≥19 Years 14 - 64 pg/mL
Interpretive Guide
Intact
Normal Parathyroid Normal
Hypoparathyroidism Low or Low Normal
Hyperparathyroidism
Primary Normal or High
Secondary High
Tertiary High
Non-Parathyroid
Hypercalcemia Low or Low Normal
PTH Calcium
Normal Parathyroid Normal
Hypoparathyroidism Low
Hyperparathyroidism
Primary High
Secondary Normal or Low
Tertiary High
Non-Parathyroid
Hypercalcemia High
Performing Laboratory
Quest SJC
New York DOH Approval Status
Yes