T4 Total (Thyroxine)

T4 Total (Thyroxine)

Preferred Specimen(s) 1 mL serum

Transport Container Plastic screw-cap vial

Transport Temperature

• Ambient 7 days,
• Refrigerated 7 days

Methodology Chemiluminescence

Clinical Significance Thyroxine (T4) is the major secretory hormone of the thyroid. Only 0.03% of T4 is unbound and free for exchange with tissues. Thyroid function may be assessed with thyroid stimulating hormone (TSH) and free T4 measured.

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