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Test Code IPTHB or LAB813 PTH, Intact and Calcium, Serum

Important Note

The test code IPTHB is for all uses except STAT intraoperative orders. IPTHB includes calcium and must be done on serum.

The test code IPTH (LAB2202) is for STAT intraoperative orders only, with no calcium included. This test is done on an EDTA tube (lavender) to expedite testing.

 

Patient Preparation: For 12 hours before this test, do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins. Biotin can interfere with many immunoassay tests.

Specimen Requirements

Container Type:

Gold or Red

 
Optimal Collection Volume: 

4.5mL; full tube
Minimum Volume:

1 mL whole blood
Collection Instructions:

Gently invert the sample 5-6 times after collection.
Specimen Transport:

Refrigerate
Processing Instructions: 

1. Allow serum to clot for 30 minutes.

2. Centrifuge specimen within 2 hours of collection.

3. After centrifugation, specimen tubes without a gel barrier should have the serum aliquoted to a false bottom container.

4. Keep serum refrigerated until testing can be performed.

Specimen Stability

Specimen Type Temperature Time
Serum Refrigerated 2 days
Room Temperature 8 hours
Frozen 6 months

Specimen Rejection Criteria

Hemolysis Mild OK; Moderate OK; Gross Reject
Lipemia Mild OK; Moderate OK; Gross Reject
Icterus Mild OK; Moderate OK; Gross Reject
Other Quantity not sufficient

Useful For

Diagnosis and differential diagnosis of hypercalcemia

 

Diagnosis of primary, secondary, and tertiary hyperparathyroidism

 

Diagnosis of hypoparathyroidism

 

Monitoring end-stage kidney failure patients for possible renal osteodystrophy

Methodology

Roche Cobas - Electrochemiluminescence assay

Reference Ranges

15-65 pg/mL

Interpretive

PTH2 - Clinical & Interpretive: Parathyroid Hormone, Serum (mayocliniclabs.com)

Day(s) Performed

24/7

Expected TAT

Same day

Performing Laboratory

Bronson Laboratory, Chemistry - Kalamazoo and Battle Creek

Sample Retention Time

7 days

CPT Code

  • PTH - 83970
  • Calcium - 82310

LOINC Code

  • PTH - 2731-8
  • Calcium - 17861-6