Dr. Thomas Panel #1 Blood Test

Quick Facts

• Sample: Blood
• Fasting: Fasting (except water) for at least 8 hours is required.
• Turnaround: 8-9 business days. May take longer based on weather, holiday, or lab delays.

What's Included

• Tri-iodothyronine (T3): Measures total T3, a thyroid hormone that helps regulate energy use and metabolism.
• Reverse T3, Serum (LC/MS/MS): Measures reverse T3, an inactive form of T3 that may increase during illness or physical stress.
• Tri-iodothyronine (T3), Free: Measures unbound T3, the active thyroid hormone available for use by the body.
• Thyroxine (T4), Free (Direct): Measures unbound T4, a thyroid hormone that the body can convert into active T3.
• Thyroid-stimulating Hormone (TSH):  A hormone produced by the pituitary gland that regulates thyroid hormone production. Helps evaluate thyroid function and identify potential thyroid disorders.

Benefits

• Reviews thyroid hormone levels through five complementary measurements.
• Includes both total T3 and free T3 for a fuller hormone picture.
• Adds reverse T3, measured by LC/MS/MS, alongside active thyroid hormones.
• Pairs TSH with T3 and T4 results for broader context.
• Gives your healthcare provider detailed information to support thyroid health discussions.

Who Is This Test For?

• You have unexplained fatigue, weight changes, or mood swings.
• You have a family history of thyroid disorders or autoimmune diseases.
• You notice hair loss, dry skin, or sensitivity to temperature changes.
• You have a previously diagnosed thyroid condition requiring regular monitoring.
• You want to evaluate your thyroid health as part of a wellness plan.

How It Works

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

FAQ

1. Do I need to fast or prepare for this test?

Plan to fast for at least 8 hours before your blood draw. Water is the only thing allowed during that time.

2. How quickly will I get results?

Expect results in 8-9 business days. Weather, holidays, or lab delays may extend that window.

3. What can my results tell me?

Together, these measurements show how your thyroid and the signals that regulate it are functioning. Thyroid hormone levels, the pituitary signal (TSH), and reverse T3 each add a different layer of information. Your healthcare provider can use them to evaluate thyroid function, though no single value tells the whole story.

4. How do I interpret the results?

Interpretation depends on how the values relate to one another, along with your symptoms, medical history, and any medications you take. Each marker reflects something different, so they will not necessarily move together. One result alone is rarely enough for a conclusion. Review the full set with a qualified healthcare provider.

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.

5. What should I do if my results are abnormal?

Reach out to your healthcare provider to go over the full picture. Patterns across several results often need clinical interpretation, and a single out-of-range value does not necessarily call for treatment. Your provider will decide whether any further evaluation makes sense for you.

Pre-test preparation

• Fasting (except water) for at least 8 hours is required.