The Free T3 (FT3) test measures the levels of unbound triiodothyronine (T3) hormone in the blood. T3 is produced by the thyroid gland and plays a vital role in regulating metabolism, heart rate, and body temperature.

This test evaluates the active form of T3 that is not bound to proteins and is freely available to tissues. FT3 is especially useful for diagnosing hyperthyroidism and monitoring thyroid treatment.

Orange Health Labs offers convenient at-home sample collection for Free T3 testing in major cities, with fast and reliable report delivery.

The FT3 (Free T3) test cost is around Rs. 380/- The test price usually includes home sample collection within 60 mins of booking. FT3 (Free T3) test price may also vary according to the city the test is booked,

No special preparation or fasting is required for the FT3 (Free T3) test.

Who Should Get This Test?

• Individuals with suspected thyroid dysfunction

• People with abnormal TSH or FT4 results

• Patients being monitored for hyperthyroidism treatment

During the Test:

• A phlebotomist will draw blood from a vein in your arm

• The collection process takes under 5 minutes

After the Test:

• Mild bruising may occur

• Results will be available within 6 hours via email or WhatsApp

A Free T3 test may be recommended for individuals showing symptoms of hyperthyroidism or when TSH levels are abnormal.

Common symptoms indicating the need for this test include:

• Rapid heartbeat or palpitations

• Anxiety and difficulty sleeping

• Weight loss without clear cause

• Hand tremors or weakness

• Heat sensitivity and excessive sweating

• Visual disturbances or bulging eyes

• Diarrhea in some cases

The FT3 test is often ordered alongside TSH and FT4 as part of a full thyroid function panel.

The Free T3 test determines whether T3 levels are within the normal range, which helps identify thyroid disorders.

Normal Range:

• Free T3: 4.26–8.10 pmol/L

• Elevated FT3 suggests hyperthyroidism, often accompanied by suppressed TSH levels

• Low FT3 may be linked to hypothyroidism or other non-thyroidal illnesses

• FT3 is used when FT4 and TSH values are borderline or inconclusive

Consult your doctor to evaluate results in the context of clinical symptoms and treatment plans.