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Test Code PTHI Parathyroid Hormone (PTH), Intact, Serum

Important Note

  Many dietary supplements promoted for hair, skin, and nail benefits contain Biotin (Vitamin B7) levels up to 650 times the recommended daily intake.  High levels of Biotin can cause clinically significant incorrect lab test results, resulting in falsely high or falsely low results, depending on the test. Patients taking high doses of Biotin should be instructed to discontinue Biotin for at least 12 hours prior to lab testing.

Performing Laboratory

MaineGeneral Medical Center

Reference Values

Adults:  18.5-88.0 pg/mL

Day(s) Test Performed

Monday - Sunday

Specimen Requirements

Serum
Draw blood in a gold-top (serum separator) gel tube from a fasting patient, (12 hour fast preferred). The patient should not take multivitamins or dietary supplements for 12 hours prior to the specimen collection. Label the specimen with the patient’s name (first and last), date of birth, date and time of draw, phlebotomist’s initials, and as serum. Spin down and send 1 mL of serum refrigerated.

 

Specimen stability:

8 hours at room temperature

8 hours refrigerated at 2-8°C

1 month when frozen at ≤-20°C

 

Minimum volume:  500 µL

 

Specimen rejection criteria: Hemolyzed specimens are not acceptable.

Test Classification and CPT Coding

83970