FT4 (Free Thyroxine 4) Test
- Category
- Thyroid
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 2 days
- Fasting
- No Fasting
- Age
- 5+ Years
What Is This Test?
Measures Free T4 (free thyroxine), the unbound, active form of the main thyroid hormone.
Why this test is performed?
Used with TSH to diagnose and monitor hypothyroidism and hyperthyroidism and to adjust treatment.
Who should take this test?
Tiredness, weight gain or loss, hair fall, feeling cold or hot, irregular periods, anxiety/palpitations, infertility or pregnancy planning.
Test Preparation
No fasting is needed. If you take thyroid medicine, give the sample before your daily dose (ideally in the morning) unless your doctor advises otherwise.
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
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- Report time: In 2 days
- No fasting
- Report time: In 2 days
- No fasting
- Report time: In 2 days
- No fasting
- Report time: In 2 days
- No fasting
Hashimoto / Hypothyroidism Panel
Thyroid
Blood sample taken from a vein in your arm
₹1,350
₹2,213
38% off
Frequently asked questions
It is usually interpreted together with TSH for an accurate assessment.
No fasting is needed. If you take thyroid medicine, give the sample before your daily dose (ideally in the morning) unless your doctor advises otherwise.
Blood sample taken from a vein in your arm.
Usually within 12–36 hours after the sample reaches the lab. You will receive the report online.
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