About Free T4 & T3 Test
Free T4 (thyroxine) and Free T3 (triiodothyronine) tests measure active thyroid hormone levels in your blood. Performed by Dr. Sanjay Kumar Thakur at GyneNepal, these tests provide detailed assessment of thyroid function beyond TSH screening. Free T4 is the main hormone produced by the thyroid gland, while T3 is the more active form. These tests help diagnose hyperthyroidism, hypothyroidism, and monitor treatment effectiveness. Essential for patients on thyroid medication, pregnant women, and those with pituitary disorders. Dr. Sanjay's expertise from CMC Vellore and Royal Marsden Hospital ensures accurate interpretation. Combined with TSH, these tests provide complete thyroid function assessment. Same-day results available.
How to Prepare
- 1No fasting required
- 2Take test in the morning for consistency
- 3Continue thyroid medications as prescribed
- 4Avoid biotin supplements 48 hours before
- 5Inform about all medications and supplements
The Procedure
Blood sample collected from arm vein. 3-5ml blood drawn into specialized tubes. Sample analyzed using electrochemiluminescence immunoassay for precise measurement of free (unbound) hormone levels.
Understanding Your Results
Same-day results. Normal Free T4: 0.8-1.8 ng/dL. Normal Free T3: 2.3-4.2 pg/mL. Detailed interpretation by Dr. Sanjay included.
Used to Diagnose
Test Details
Category
Laboratory Tests
Duration
5 minutes for blood collection
Cost Range
NPR 1,200 - 1,800 (both tests)