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

Methodology

Immunoassay
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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
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Performing Laboratory

Quest SJC
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