Thyroid Antibodies Blood Test Panel Plus Reverse T3

Quick Facts

• Sample: Blood
• Fasting: No fasting is required. Stop biotin consumption at least 72 hours prior to collection. Collection should not occur during or after heparin administration.
• Turnaround: 4-6 business days. May take longer based on weather, holiday, or lab delays.

What's Included

• Thyroid Peroxidase (TPO) Ab: Measures antibodies to thyroid peroxidase, an enzyme involved in thyroid hormone production, to help evaluate autoimmune thyroid activity.
• Thyroglobulin Antibody: Measures antibodies against thyroglobulin, a protein used by the thyroid to produce hormones, helping to evaluate thyroid autoimmune activity.
• Reverse T3, Serum: Measures the biologically inactive form of T3 (triiodothyronine), reflecting how the body is converting thyroid hormone T4.

Benefits

• Checks for thyroid antibodies linked to autoimmune thyroid activity.
• Measures Reverse T3 to assess thyroid hormone conversion.
• Offers a broader view of thyroid health in one panel.
• Requires no fasting for your convenience.
• Fast turnaround supports timely follow-up with your provider.

Who Is This Test For?

• Individuals whose provider has recommended thyroid antibody evaluation.
• People with a personal or family history of thyroid concerns.
• Those following up on prior thyroid hormone test results.
• Individuals with other autoimmune conditions being evaluated for thyroid involvement.
• People interested in a broader look at thyroid hormone conversion.

How It Works

1. Order Your Test Online
2. Visit a Local Lab
3. Get Results Online

FAQ

1. What is the purpose of this panel?

This panel measures thyroid peroxidase (TPO) antibodies, thyroglobulin antibodies (TAA), and Reverse T3. The antibody markers help evaluate autoimmune activity affecting the thyroid, while Reverse T3 reflects how your body converts thyroid hormone T4. Together, these markers provide a broader picture of thyroid health. This panel does not diagnose a condition on its own.

2. When might I consider ordering this panel?

You may consider this panel as part of a broader thyroid health evaluation, after other thyroid tests, or for ongoing monitoring as directed by your healthcare provider. It may also be useful for people with a personal or family history of thyroid concerns or other autoimmune conditions being evaluated for possible thyroid involvement.

3. Do I need to fast or prepare before this test?

Fasting is not required. Stop taking biotin at least 72 hours before collection, and do not collect the sample during or after heparin administration.

4. How quickly will I get results?

Results are typically available in 4–6 days. Weather, holidays, or laboratory delays may extend this timeframe.

5. How do I interpret the results?

Patterns across the antibody markers and Reverse T3 may provide more useful context than any one value alone. Review the full results with your healthcare provider alongside your health history and prior test results.

Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.

6. What should I do if my results are outside the expected range?

Share your results with your healthcare provider. They can interpret them in the context of your health history and determine whether any next steps are appropriate.

7. How often should I get tested?

Testing frequency varies by individual circumstances. Follow your healthcare provider’s guidance based on your health history and prior results.

Pre-test preparation

No fasting is required. Stop biotin consumption at least 72 hours prior to the collection. Collection should not occur during or after the administration of heparin.