Thyroid Profile (Free T3, T4, TSH)

What this test checks

This panel measures three things together: TSH (the brain's signal to the thyroid), and free T3 and T4 (the two thyroid hormones doing the actual work in your body). Together they give a complete picture, especially when TSH alone gives an unclear result.

Why do people get this test?

When TSH is borderline or symptoms are strong, doctors prefer the full panel — it can pick up early thyroid issues that a TSH-only test would miss. It is the more thorough option for women planning pregnancy or for ongoing thyroid follow-up.

When you should consider this test

• TSH result is borderline or inconsistent with symptoms
• Planning pregnancy or already pregnant
• Existing thyroid disease being followed long-term
• Strong symptoms of thyroid imbalance
• Family history of thyroid disease with vague symptoms

How to prepare

No fasting required. Take thyroid medicine, if any, after the blood draw rather than before.