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Test Code PTH2 Parathyroid Hormone, Serum

Reporting Name

Parathyroid Hormone (PTH), S

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

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type


Specimen Required

Patient Preparation:

1. For 12 hours before specimen collection do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.

2. Patient should be fasting for 12 hours

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Specimen Minimum Volume

0.75 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Frozen (preferred) 180 days
  Refrigerated  72 hours
  Ambient  8 hours

Reference Values

<1 month: 7.0-59 pg/mL

4 weeks-11 months: 8.0-61 pg/mL

12 months-10 years: 11-59 pg/mL

11 years-17 years: 15-68 pg/mL

18 years and older: 15-65 pg/mL

Day(s) Performed

Monday through Saturday

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
PTH2 Parathyroid Hormone (PTH), S 2731-8


Result ID Test Result Name Result LOINC Value
PTH2 Parathyroid Hormone (PTH), S 2731-8

Report Available

Same day/1 to 2 days

Reject Due To

Gross hemolysis Reject
Gross lipemia OK

Method Name



If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.