T3/T4 Thyroid Test: Components, Cost, & Results

This test determines the concentration of triiodothyronine (T3) in your blood. T3 is one of two major hormones produced by your thyroid, a small, butterfly-shaped gland near your throat.

The other hormone, thyroxine (T4) and T3 work in tandem to control how your body uses energy. These hormones are also involved in regulating your weight, body temperature, muscle strength, and nervous system.

Thyroid Function Tests

Blood tests are commonly used to check thyroid function, but not all tests are necessary in every situation. Here’s a breakdown of the main tests to evaluate thyroid health:

TSH Test

The TSH (Thyroid-Stimulating Hormone) test is often the first test to check thyroid function. Changes in TSH can signal thyroid problems before hormone levels become too high or low.

High TSH: This suggests your thyroid isn’t producing enough hormone (hypothyroidism).
Low TSH: This usually means your thyroid is making too much hormone (hyperthyroidism).
Normal TSH: Indicates your thyroid is working properly in most cases.

T4 Test

There are two main types of T4 tests:

Total T4: Measures both the bound and free T4 in the blood.
Free T4: Measures the unbound T4, which can enter body tissues and have an effect.

For the most accurate thyroid function results, doctors typically check TSH and Free T4 together.

Elevated TSH and low Free T4: Suggests hypothyroidism due to thyroid problems.
Low TSH and low Free T4: Points to hypothyroidism related to pituitary issues.
Low TSH and elevated Free T4: Suggests hyperthyroidism.

T3 Test

T3 testing is helpful for diagnosing hyperthyroidism or determining how severe it is. Elevated T3 levels usually indicate hyperthyroidism, especially when TSH is low. T3 is less useful in diagnosing hypothyroidism because it is often the last thyroid hormone to show changes. People can have high TSH and low Free T4 but still have normal T3 levels, even when severely hypothyroid.

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Components of a Full Thyroid Panel

A full thyroid blood test measures T3 T4 TSH test various hormones and antibodies to give a complete picture of how your thyroid is functioning. Here’s what it includes:

TSH (Thyroid-Stimulating Hormone)
T3 or Free T3 (Triiodothyronine)
T4 or Free T4 (Thyroxine)
TPO (Thyroid Peroxidase Antibodies)
TG (Thyroglobulin)
TGAb (Thyroglobulin Antibodies)
TSI (Thyroid-Stimulating Immunoglobulin)

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What Can Affect Thyroid Test Results?

Certain medications interfere with thyroid hormone levels, affecting the accuracy of test results.
The timing between your last dose of thyroid medication (especially if it contains T3 ,T4 thyroid test) and when your blood is drawn can impact your results.
Eating before a thyroid scan or certain thyroid tests and T3 T4 test results can alter the outcome, so fasting may be required.
Stress, as well as non-thyroidal illnesses,Normal T3,T4 levels can influence thyroid hormone levels, leading to inaccurate test results.

T3/T4 Test Cost in India

Test Type	Blood Test
Preparation	Inform the doctor if you take any medication, have allergies or any medical condition. Fasting is required for about 8 to 10 hours.
Report	Within 1 to 2 days.
T3/T4 test costs in Hyderabad	Rs. 1000 to Rs.2000 approximately.
T3/T4 test costs in Vizag	Rs. 500 to Rs.1500 approximately.
T3/T4 test costs in Nashik	Rs. 500 to Rs.1500 approximately
T3/T4 test costs in Aurangabad	Rs. 1000 to Rs.2000 approximately
T3/T4 test costs in Nellore	Rs. 1000 to Rs.2000 approximately
T3/T4 test costs in Chandanagar	Rs. 500 to Rs.1500 approximately
T3/T4 test costs in Srikakulam	Rs. 500 to Rs.1500 approximately
T3/T4 test costs in Sangamner	Rs. 500 to Rs.1500 approximately
T3/T4 test costs in Kurnool	Rs. 1000 to Rs.2000 approximately
T3/T4 test costs in Kakinada	Rs.1000 to Rs.2000 approximately
T3/T4 test costs in Karimnagar	Rs. 500 to Rs.1500 approximately
T3/T4 test costs in Zaheerabad	Rs. 500 to Rs.1500 approximately
T3/T4 test costs in Sangareddy	Rs. 500 to Rs.1500 approximately
T3/T4 test costs in Nizamabad	Rs. 500 to Rs.1500 approximately
T3/T4 test costs in Mumbai	Rs. 1000 to Rs.2000 approximately
T3/T4 test costs in Begumpet	Rs. 500 to Rs.1500 approximately
T3/T4 test costs in Vizianagram	Rs. 500 to Rs.1500 approximately

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Frequently Asked Questions

Is a Thyroid Test Fasting Required?

Most doctors will advise you not to fast before your thyroid function test.

What happens if T3 levels are low?

Low T3 levels can indicate an underactive thyroid, also known as hypothyroidism.

When is the best time to perform a thyroid test?

I recommend scheduling thyroid function tests first thing in the morning.

Is it okay to drink water before my thyroid test?

You can drink water before a thyroid test.

How can I naturally boost my T3 levels?

Several health studies have found that exercise raises T3 and T4 hormone levels.

Can a lack of T3 lead to weight gain?

T3 and T4 thyroid hormones are low, and weight gain is common.

What happens if T4 levels are low?

Hypothyroidism occurs when the thyroid gland produces insufficient T4, causing metabolism to slow. This may result in the following symptoms: slow down your heart rate, fatigue or tiredness

Is it necessary to fast before taking the T4 test?

Before the test, you may need to fast (not eat or drink) for several hours

Can low T3 levels cause anxiety?

Yes, thyroid disease can impact your mood, primarily causing anxiety or depression.

How do you fix low T3 levels?

If you find someone skilled at treating low T3, treatment may include a 4:1 ratio of Levothyroxine (T4) and Liothyronine (T3) (four parts of T4 to one part of T3).