T4 Free & T3 Free FT4 & FT3 Test
Short Name: Free T4 & Free T3 Test
Also known as: Free T4 and Free T3 Test, Thyroid Hormone Test, FT4 FT3 Test
T4 Free & T3 Free FT4 & FT3 Test test available at DNA Labs India for ₹913. Uses Chemiluminescent Immunoassay on Serum samples. Results in Results are typically available within 2-3 days after sample collection.. Free home collection in 300+ cities across India.
🩺 Medically Reviewed By
Dr Ramarao Paidisetty
Consultant Biochemist · Reg: 21504
Last reviewed: September 7, 2026
Overview
The primary purpose of the T4 Free & T3 Free FT4 & FT3 Test is to evaluate thyroid function by measuring the free, active forms of T4 and T3 hormones. This helps in diagnosing thyroid disorders, monitoring treatment efficacy, and assessing hormone levels in individuals with symptoms suggestive of thyroid dysfunction.
- Test Code
- 1416
- Price
- ₹913
- Sample Type
- Serum
- Result Time
- Results are typically available within 2-3 days after sample collection.
- Fasting Required
- No
- Method
- Chemiluminescent Immunoassay
Sample Collection
No special preparation is required for this test.
Method: Venipuncture
Laboratory Analysis
A healthcare professional will draw a blood sample from a vein in your arm using a needle and collect it in a tube.
Report Delivery
Apply pressure to the puncture site with a cotton ball to stop bleeding and avoid heavy lifting for a few hours.
Timeline: Results are typically available within 2-3 days after sample collection.
Patient Instructions
About This Test
Who Should Get This Test
The primary purpose of the T4 Free & T3 Free FT4 & FT3 Test is to evaluate thyroid function by measuring the free, active forms of T4 and T3 hormones. This helps in diagnosing thyroid disorders, monitoring treatment efficacy, and assessing hormone levels in individuals with symptoms suggestive of thyroid dysfunction.
How to Prepare
- Collect 2 mL of blood in a Serum Separator Tube (SST).
- Centrifuge the sample and separate the serum.
- Ship the sample refrigerated or frozen to maintain stability.
Doctor's Notes
Reviewed by Dr Ramarao Paidisetty — MBBS, MD (Biochemistry) · Reg. No. 21504
"Measuring free hormone levels like FT4 and FT3 is crucial for accurately assessing thyroid function, as they are not affected by protein binding variations and reflect the biologically active hormone pool."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Sample Stability
- Hemolyzed or lipemic samples
- Insufficient sample volume
- Improper labeling or container
- Sample collected in wrong tube type
Understanding Your Results
Free T4 (FT4)
Free T3 (FT3)
Consult a doctor if you experience persistent symptoms of thyroid disorders, have abnormal test results, or need guidance on treatment options.
Limitations
- ⚠Results can vary between laboratories due to different methods
- ⚠Not a standalone diagnostic tool; must be interpreted with clinical symptoms and other tests
- ⚠May not reflect thyroid status in severe non-thyroidal illness
Risks & Considerations
- ●Minor bruising or soreness at the puncture site
- ●Rare risk of infection or excessive bleeding
- ●Dizziness or lightheadedness during blood draw
Interfering Factors
- ●Medications such as thyroid drugs, steroids, or anticonvulsants
- ●Acute illness or stress
- ●Pregnancy or hormonal changes
- ●Genetic factors affecting hormone binding proteins
- ●Recent radioactive iodine therapy
Frequently Asked Questions
What is the T4 Free & T3 Free FT4 & FT3 Test?
Why is this test performed?
What symptoms indicate the need for this test?
How is the test performed?
What is the cost of the test in India?
Is fasting required before the test?
What do the results of FT4 and FT3 mean?
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Are there any risks associated with the test?
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