Advanced Insider Thyroid Panel - Quest

This panel answers a chain of connected questions: Is your thyroid receiving the right signal (TSH), producing enough hormone (Total and Free T4, Total and Free T3), converting that hormone into its active form in your tissues (Free T3 alongside Reverse T3), and is your immune system attacking the gland (TPO and Thyroglobulin antibodies)? Measuring these together matters because a normal TSH alone can mask real problems — for example, adequate T4 production but poor peripheral conversion to T3, or elevated Reverse T3 during periods of stress or caloric restriction, both of which show up only when the downstream markers are included. The antibody tests add a distinct layer, identifying autoimmune conditions like Hashimoto's or Graves' that can be present years before TSH shifts out of range. This depth is why the full picture explains symptoms like unexplained fatigue, cold intolerance, weight changes, or stalled recovery that a single-marker screen often misses. Ordering these nine markers individually is costly and logistically awkward, whereas one blood draw captures production, conversion, and autoimmune status in a single snapshot you can review with your clinician. The addition of serum iodine — the raw material for hormone synthesis — rounds out whether a deficiency or excess could be influencing the results.