Test Code IETG Interference Evaluation Heterophile, Thyroglobulin Tumor Marker, Serum

Ordering Guidance

If interference or heterophile testing is not required, order HTG2 / Thyroglobulin, Tumor Marker, Serum.

For fine-needle aspirate specimens, order TFNAB / Thyroglobulin, Tumor Marker, Fine-Needle Aspiration Biopsy Needle Wash.

Specimen Required

Patient Preparation: 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.

Collection Container/Tube: Red top (serum gel/SST are not acceptable)

Submission Container/Tube: Plastic vial

Specimen Volume: 2.5 mL

Collection Instructions: Centrifuge and aliquot serum into a plastic vial.

Specimen Type

Serum Red

Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type	Temperature	Time
Serum Red	Refrigerated (preferred)	7 days
	Frozen	30 days
	Ambient	72 hours

Reject Due To

Gross hemolysis	Reject
Gross lipemia	OK
Gross icterus	Reject

Reference Values

THYROGLOBULIN TUMOR MARKER

Athyrotic: <0.1 ng/Ml

Intact thyroid: ≤33 ng/mL

THYROGLOBULIN, MASS SPECTROMETRY

Athyrotic: <0.2 ng/mL

Healthy individuals with intact, functioning thyroid: ≤33 ng/mL

THYROGLOBULIN ANTIBODY

<1.8 IU/mL

Reference values apply to all ages.

Day(s) Performed

Monday through Saturday

Report Available

3 to 6 days

Specimen Retention Time

6 months

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

84432

86800