Test Overview
Test Methodology

Immunometric Chemiluminescence

Test Usage

Useful in the differential diagnosis of fluid and electrolyte balance, hydration status, aid in diagnosis of hyperparathyroidism.

Reference Range *

PTH Intact: 10 - 65 pg/mL;
Calcium: Pediatric (1-12 years) 8.4 - 10.4 mg/dL
Adult (>12 years) 8.6 - 10.2 mg/dL

Test Details
Analytic Time

8 hours

Soft Order Code
PTHI
MiChart Code
PTH, Intact and Calcium
Synonyms
  • C-Terminal Replacement Assay
  • N-Terminal Replacement Assay
  • IPTH
  • Parathormone
  • PTHR
  • PARATHYROID HORMONE, INTACT
  • PARATHORMONE, INTACT RAPID
  • PARATHORMONE, INTACT
  • PTHI
  • TCAL
  • PARATHYROID HORMONE, INTACT
  • CALCIUM PTH
  • MPTHI
  • PTHVS
  • PTHI Venous Sampling
Laboratory
Chemical Pathology
Section
Automation
Specimen Requirements
Collection Instructions

Collect specimen in an SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate up to 48 hours or freeze for longer storage. EDTA plasma is also acceptable. If sending EDTA plasma, include a copy or note on the requisition the patient's calcium result performed on a specimen collected within the previous 48 hours OR send 0.5 mL serum, refrigerated, for calcium level to be performed by MLabs. Clearly mark aliquots "plasma" or "serum" as appropriate. Add-on test requests for previously processed in-lab samples will be honored for 24 hours.

Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.3 mL serum
Additional Information

The Intact PTH assay is recommended for diagnosis of parathyroid disease. If either C-terminal or N-terminal assay is ordered, the client will be contacted to approve the intact PTH as a substitute test. The specimen will be saved for 1 week; the requesting physician should contact the MLabs Client Services Center if the C-terminal assay is required; the N-Terminal assay not available from any reference laboratory.

Billing
CPT Code
83970
Fee Code
23313
LOINC
Z50-5
NY State Approved
No