What does this test include?
The panel includes TSH, FT4, and FT3 for thyroid function, as well as Anti-TPO and Anti-Tg—antibodies that can support evaluation for an autoimmune process.
Why might it be ordered?
- When symptoms or previous results suggest abnormal thyroid function.
- When your clinician is assessing whether an abnormal thyroid result may have an autoimmune cause.
What sample is needed?
A healthcare professional collects a venous blood sample. Depending on the method, the laboratory uses serum or plasma.
How should you prepare?
For follow-up testing, try to have samples collected at a similar time and under similar conditions. Tell the laboratory if you take thyroid hormone or biotin. Tell the laboratory about all medicines, hormone treatments, vitamins and supplements you take. Do not stop or change treatment unless your clinician tells you to. Follow any instructions about fasting and the time of collection.
How are the results reported?
TSH, FT4 and FT3 are interpreted together. Anti-TPO and Anti-Tg detect antibodies, but a positive result does not automatically mean that you have autoimmune thyroid disease. Your result is interpreted using the reference interval on the laboratory report and in the context of your symptoms, medical history and other test findings.
Sources and editorial status
This patient-facing text is an editorial draft. It should be approved by a laboratory physician before official publication.