Free T-4

Free T-4 (thyroxine) is the primary thyroid hormone regulating metabolism, growth, heart rate, and body temperature. This test assesses thyroid function independent of thyroid-binding proteins. Free T-4 specifically measures unbound hormone available to tissues—more accurate than total T-4. Elevated T-4 indicates hyperthyroidism (Graves' disease, thyroiditis); low T-4 suggests hypothyroidism or central thyroid dysfunction. Combined with TSH testing, Free T-4 diagnoses and monitors thyroid disorders and guides levothyroxine replacement therapy. Essential for patients with fatigue, weight changes, cold intolerance, or palpitations. Available at Raazi Lab Islamabad. Price: ₨1,000. Results 24 hours.