Free T4 (free thyroxine)
Thyroid disorders are common medical conditions, more common in women than men and increasing with age in both sexes. Thyroxine circulates bound to thyroxine binding globulin (TBG) and albumin, and the free fraction represents the biologically active fraction. Free T4 is measured and, together with TSH, is a frontline test for investigation and monitoring of thyroid disorders.
Signs and symptoms of hypothyroidism include: poor muscle tone (muscle hypotonia), fatigue, increased sensitivity to cold, constipation, depression, muscle cramps and joint pain, carpal tunnel syndrome, goiter, paleness, osteoporosis, dry/itchy skin, weight gain and water retention, bradycardia and abnormal menstrual cycles
|Sample & container required||SST (gold top)|
|Sample volume||0.5 mL|
|Turnaround time||1 day|