Thyroid Panel Suiteblood
Free T4
Alternative names: FT4, Free Thyroxine, Thyroxine Free
Clinical Summary
MedlinePlus describes T4 as thyroxine, one of the main hormones produced by the thyroid gland to control metabolism.
Higher-Than-Range Notes
MedlinePlus notes high Free T4 levels suggest an overactive thyroid gland (hyperthyroidism).
Lower-Than-Range Notes
MedlinePlus notes low Free T4 levels suggest an underactive thyroid gland (hypothyroidism).
Commonly Measured Alongside
Longitudinal Tracking
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General Reference Information: This definition is sourced from public health reference libraries for patient education. It is not intended to substitute professional medical diagnosis, clinical reviews, or treatment plans. Always consult with a qualified health provider regarding your laboratory results.