Thyroid Function Test – TSH, T3 & T4 Panel

Diagnose hypothyroidism, hyperthyroidism, and thyroid disorders with a comprehensive thyroid panel. Morning sample preferred for most accurate TSH results.

📲 Book Thyroid Test 📞 +91-9021491236

What is a Thyroid Function Test?

The Thyroid Function Test (TFT) measures the levels of thyroid hormones — Thyroid Stimulating Hormone (TSH), Triiodothyronine (T3), and Thyroxine (T4) — in your blood. These hormones control your body's metabolism, energy production, temperature regulation, heart rate, and numerous other vital functions.

Thyroid disorders are among the most common hormonal conditions in India, affecting an estimated 1 in 10 adults — and many cases go undetected for years. A simple blood test can identify whether your thyroid gland is underactive (hypothyroidism) or overactive (hyperthyroidism), allowing early treatment and preventing serious complications.

Thyroid Test Parameters & Normal Ranges

Parameter	Normal Range	What It Indicates
TSH	0.4–4.0 mIU/L	Master regulator; high = hypothyroidism; low = hyperthyroidism
Free T3 (fT3)	2.3–4.2 pg/mL	Active thyroid hormone; low in hypothyroidism
Free T4 (fT4)	0.8–1.8 ng/dL	Prohormone; low = hypothyroidism; high = hyperthyroidism
Total T3	80–200 ng/dL	Overall T3 (bound + free)
Total T4	5.0–12.0 μg/dL	Overall T4 (bound + free)

When Should You Get a Thyroid Test?

⚖️Unexplained weight gain or weight loss

😴Persistent fatigue, weakness, or sluggishness

💇Hair thinning, hair loss, or dry skin

🩸Irregular or missed menstrual periods

🌡️Feeling cold all the time (hypothyroidism) or always warm (hyperthyroidism)

💓Palpitations, anxiety, or irritability

🧠Depression or brain fog

🦒Neck swelling (goiter) or difficulty swallowing

🕐 Sample Collection Tip

TSH levels naturally fluctuate throughout the day and are highest in the morning. For the most accurate and consistent TSH result, we recommend getting your blood drawn between 7 AM – 10 AM. No strict fasting is required, though avoiding heavy meals before the test is advisable.

Frequently Asked Questions

Do I need to stop my thyroid medication before the test?+

Do not stop thyroid medication (like Eltroxin/Levothyroxine) before the test without your doctor's advice. The test is typically done while on medication to monitor its effectiveness. If your doctor specifically wants a baseline reading off medication, they will advise you.

What is a normal TSH level?+

The standard normal range for TSH is 0.4–4.0 mIU/L, though optimal ranges vary by age, pregnancy, and individual factors. A TSH above 4.0 generally suggests hypothyroidism; below 0.4 suggests hyperthyroidism. Always interpret results with your doctor.

Can thyroid problems cause weight gain?+

Yes — hypothyroidism (underactive thyroid) commonly causes weight gain, fatigue, and a slowed metabolism. An overactive thyroid (hyperthyroidism) typically causes weight loss despite increased appetite. Both conditions are highly treatable once diagnosed.

Is home sample collection available for thyroid test?+

Yes! Our trained phlebotomist will visit your home for blood collection. We recommend scheduling early morning slots (7–10 AM) for the most accurate TSH results. Book by calling or WhatsApping +91-9021491236.

How often should I retest my thyroid?+

If you're on thyroid medication, your doctor will typically recommend retesting every 6–12 weeks after a dose change, then every 6 months once stable. For healthy individuals without symptoms, annual screening is generally sufficient — especially for women above 35 and anyone with a family history of thyroid disease.