Free T3 / Free T4 / ultrasensitive TSH
Endocrinology and hormones
- Common abbreviation
- FT3/FT4/TSH
- Specimen
- Serum
- Indications noted in the research
- Precise thyroid assessment
From the Docwrite test research, 11 September 2026. About the sources. This is a reference catalogue; the prescribing clinician and performing lab determine the appropriate test, sample and preparation. Package contents vary by provider.