Comprehensive Thyroid Panel (TSH, Free T3, Free T4, TPO Antibodies)
Complete thyroid evaluation measuring TSH, Free T3, Free T4, and TPO antibodies to assess thyroid function and detect autoimmune thyroid conditions.
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What this test measures
This comprehensive thyroid panel measures four key markers that provide a complete picture of thyroid function and health. TSH (thyroid-stimulating hormone) is produced by the pituitary gland and signals the thyroid to produce hormones. Free T3 and Free T4 are the active forms of thyroid hormones that directly affect metabolism, heart rate, body temperature, and energy levels. TPO (thyroid peroxidase) antibodies indicate whether the immune system is attacking the thyroid gland, which is a hallmark of autoimmune thyroid conditions like Hashimoto's thyroiditis.
Unlike basic thyroid tests that only measure TSH, this comprehensive panel provides insight into hormone production at the thyroid level and can detect autoimmune processes that may not yet be affecting hormone levels. In early autoimmune thyroid disease, TSH and thyroid hormones may still appear normal while TPO antibodies are already elevated, indicating active immune attack on the thyroid. This makes the comprehensive panel particularly valuable for individuals with thyroid symptoms but normal TSH results, or those at risk for thyroid autoimmune conditions.
What's included
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals experiencing unexplained fatigue, weight changes, mood swings, or temperature sensitivity
- Those with a family history of thyroid disease or autoimmune conditions
- Individuals with persistent thyroid symptoms despite normal TSH results from previous testing
- People taking thyroid medication who want to monitor their complete hormone profile and antibody levels
- Those concerned about Hashimoto's thyroiditis or other autoimmune thyroid conditions
- Individuals seeking comprehensive thyroid screening as part of preventive health monitoring
What to expect
Preparation
No fasting is required for this test. Individuals taking thyroid medication should consult with their healthcare provider about timing, as some may recommend testing before taking the morning dose. Biotin supplements should be stopped 72 hours before testing as they can interfere with results.
Sample Type
A simple blood draw from a vein in the arm, similar to any routine blood test.
Collection
The blood sample collection takes just a few minutes at any participating laboratory location. No special procedures or extended appointments are needed.
Turnaround
Results are typically available within 1-2 business days and will be securely delivered through the online patient portal.
Understanding your results
This comprehensive panel provides a complete assessment of thyroid function by measuring hormone levels and detecting autoimmune activity. Healthcare providers typically interpret these results together, looking for patterns that indicate different thyroid conditions. Normal results across all four markers generally indicate healthy thyroid function, while abnormal patterns can help identify specific thyroid disorders. It's important to look at the complete picture and track trends over time rather than focusing on individual results in isolation.
| Population | Reference Range | Notes |
|---|---|---|
| Adults | TSH: 0.45-4.50 mIU/L | Normal TSH levels indicate appropriate pituitary signaling to the thyroid |
| Adults | Free T3: 2.0-4.4 pg/mL | Free T3 represents the active thyroid hormone available to tissues |
| Adults | Free T4: 0.82-1.77 ng/dL | Free T4 is the storage form that converts to active T3 as needed |
| Adults | TPO Antibodies: 0-34 IU/mL (normal is less than 5.6 IU/mL by some lab standards) | Elevated TPO antibodies indicate autoimmune attack on the thyroid |
Reference ranges shown are general guidelines. Your lab report will include the specific reference range used by the laboratory that processed your sample, which is the authoritative range for interpreting your results.
What does a “Low” result mean?
Low TSH levels may indicate hyperthyroidism, where excess thyroid hormone suppresses TSH production. Low Free T3 or Free T4 levels can be a sign of thyroid hypofunction or hypothyroidism. T3 levels are frequently low in sick or hospitalized patients even without thyroid disease. Low TPO antibodies are generally normal and indicate no autoimmune attack on the thyroid. In rare cases, both low TSH and low T4 levels may indicate a pituitary gland problem rather than a thyroid issue.
What does a “High” result mean?
High TSH levels typically indicate hypothyroidism, meaning the thyroid gland is not producing enough thyroid hormone. Elevated Free T3 or Free T4 levels may suggest hyperthyroidism, where the thyroid is producing excess hormones. High TPO antibodies above 35 IU/mL indicate that the immune system is attacking the thyroid gland, which is the primary marker of Hashimoto's thyroiditis. These elevated antibody levels can be present for years before thyroid hormone levels become abnormal, making early detection possible.
Privacy & confidentiality
All test orders are authorized and results reviewed by an independent, board-certified physician who is not the patient's personal doctor. Your thyroid test results are completely confidential and protected by strict privacy protocols. Results are <u>not reported to your personal doctor</u> unless you specifically request it, and they are <u>not added to your medical records</u> or insurance files. The test and results will <u>not appear on insurance statements</u> or explanation of benefits forms, ensuring complete privacy. Your information is never shared with employers, insurance companies, or government agencies. You maintain full control over your health information and can choose to share results with healthcare providers at your discretion. This private testing allows individuals to monitor their thyroid health proactively and seek appropriate care without any impact on their insurance premiums or medical history. All data is encrypted and stored securely, with access limited only to you through your secure online patient portal.
Frequently asked questions
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CPT Code: 84443, 84481, 84439, 86376
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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