Free T3 Test
Blood (Serum)
Endocrinology
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When Should You Get Free T3 Test
Free T3 is typically ordered when investigating:
- Symptoms of hyperthyroidism despite a normal Free T4 result
- Suspected T3 toxicosis, a form of overactive thyroid driven mainly by T3
- Monitoring treatment for known hyperthyroidism
- Unclear or borderline TSH results needing further clarification
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Quick Facts
CategoryEndocrinology
Specimen TypeBlood (Serum)
Organ System—
Available At0 labs
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