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    What Is a Thyroid Function Test (TFT)?

    The Thyroid Function Test (TFT) is a simple blood test utilised to assess the functionality of the thyroid gland. The thyroid gland is a butterfly-shaped organ responsible for producing hormones that regulate vital bodily processes such as metabolism, heart rate, and emotional well-being. If you are experiencing symptoms like irritability, fatigue, or unexplained changes in weight, your physician may recommend a Thyroid test. This test evaluates the levels of thyroid-stimulating hormone (TSH), triiodothyronine (T3), and tetraiodothyronine (T4) hormones to determine thyroid function. By identifying conditions like hyperthyroidism or hypothyroidism, the test aids in diagnosing thyroid disorders.

    Opting for a comprehensive TFT panel for a thorough assessment of thyroid function becomes crucial in the stressful and fast-paced lifestyle of Delhi where stress can become a predictor of disturbed thyroid function.

    Thyroid Function Test Parameters

    TFT tests involve three main parameters that can help detect any deviations in thyroid hormone levels, indicating potential deficiencies or excesses. These parameters are as follows:

    Thyroxine (T4)

    The T4 hormone is the among main hormones circulating in the blood. The total T4 test measures both bound and free T4. Some T4 in the body remains attached to the proteins in the stored form, whereas free T4 is readily available for use by the cells and tissues. This test offers a comprehensive evaluation of T4 availability and functionality.

    Triiodothyronine (T3)

    T4 gets converted in the liver into T3. It is another essential thyroid hormone measured in TFT. In cases where hyperthyroidism is suspected but T4 levels appear normal, a T3 test confirms the diagnosis. This distinction is crucial as T3 levels may be elevated while T4 levels remain within range, aiding in the accurate diagnosis of hyperthyroidism.

    Thyroid-stimulating hormone (TSH)

    TSH, produced by the pituitary gland in the brain, regulates thyroid hormone production. It serves as the primary indicator of thyroid function and is often the initial test recommended by physicians. Persistent fluctuations in TSH levels can signal thyroid issues before significant alterations occur in T3 and T4 levels.

    You should have concerns regarding your thyroid hormone levels, it is important to consult your physician and arrange a TFT test at home.

    Thyroid Function Test Preparation

    Before undergoing a Thyroid Function test (TFT), it's essential to consider the following:

    Pre-requisites: Fasting is not required for the Thyroid test.

    Best Time to Get Tested: Optimal results for the Thyroid test are obtained from morning samples. Consistency in timing is crucial; schedule the test at the same time of the day every time you do this test.

    Who Should Do the Thyroid Test: Anyone willing to assess their thyroid function can undergo testing. Thyroid issues can affect individuals of any age. Consider the test if you exhibit symptoms suggestive of a thyroid disease, are pregnant, experiencing fertility issues, or have a family history of thyroid disease. If you're already on thyroid medication, monitoring your hormone levels with this test may be necessary.

    Cautions Before Taking Thyroid Test: Several factors can influence Thyroid test results, including the timing of your last dose of thyroid medication (especially if it contains T3), stress levels (including non-thyroidal illnesses), dietary habits, and sleep patterns. Additionally, certain medications and supplements may impact the results. Therefore, your doctor should be informed about them.

    To ensure accurate diagnosis and interpretation of results, discuss these factors with your doctor before scheduling your Thyroid test.

    Why Take a Thyroid Function Test (TFT)?

    The thyroid gland is chiefly responsible for regulating metabolism, the process of converting food into energy, which is essential for cellular function. When thyroid function is disrupted, it impacts the entire body, leading to illness. Imbalances in thyroid hormones, whether excess or deficiency, can cause health issues.

    Symptoms of thyroid disorders can be diverse, often resembling those of other conditions or natural life stages, complicating diagnosis. Symptoms generally fall into two categories: hyperthyroidism and hypothyroidism, each with their distinct manifestations due to their opposing effects on metabolism.

    Hyperthyroidism accelerates metabolic processes, causing symptoms like excessive sweating, heat intolerance, weight loss, nervousness, rapid heartbeat, and increased bowel movements.

    In contrast, hypothyroidism slows down metabolism, resulting in symptoms such as heightened sensitivity to colds, unexplained weight gain, muscle aches, fatigue, weakness, slow heartbeat, and constipation.

    Consider a thyroid checkup if you:

    • Are pregnant or preparing for pregnancy

    • Are undergoing fertility assessments

    • Are receiving thyroid hormone replacement therapy

    • Have a family background of thyroid disorders

    Timely testing and diagnosis are crucial if you suspect a thyroid issue, so that prompt treatment can be initiated. Regular testing to monitor thyroid hormone levels is essential to assess treatment effectiveness and ensure optimal health management.

    Thyroid Function Test (TFT) Results & Interpretation

    Range for TSH Test Results

    Here are the typical ranges for healthy individuals who are not pregnant:

    • 0.400 to 4.049 µIU/mL

    For pregnant individuals, the TSH range is as follows:

    TrimesterTSH (µIU/mL)
    First0.100 to 2.50
    Second0.200 to 3.00
    Third0.300 to 3.00

    Understanding TSH Result Factors

    High Levels : A high TSH level suggests that the thyroid gland is not producing enough thyroid hormone, known as primary hypothyroidism.

    Low Levels : A low TSH level typically indicates an overproduction of thyroid hormone, known as hyperthyroidism.

    Factors Influencing TSH Results

    • Time of Meal and Circadian Rhythm: Few studies have shown that TSH levels can fluctuate depending on food intake and the time of day, with notable variations observed throughout the day and in response to eating.

    • Other Factors: It is important to recognize that TSH is a labile hormone and is subject to non-thyroidal pituitary influences (glucocorticoids, somatostatin, dopamine, etc.), stress, activity, that can disrupt the TSH/free T4 relationship, genetics, poisonous substances and radiation exposure, inflammation of the thyroid gland, deficiency or excess of iodine in the diet, pregnancy, certain medications – antidepressants, cholesterol lowering drugs, chemotherapy drugs, steroids, thyroid cancer.

    Range for T4 and T3 Test Results

    The normal T4 and T3 levels in non-pregnant individuals are given below:

    • Total T4: 5.53-11.0 μg/dL

    • Free T4: 0.78-2.1 ng/dL

    • Total T3: 0.97-1.69 ng/dL

    • Free T3: 2.77-5.27 pg/mL

    For pregnant individuals, the T4 and T3 range is as follows:

    TrimesterT4 (μg/dL)T3 (ng/mL)
    First7.57 - 8.131.21 to 1.32
    Second7.17 - 8.641.13 to 1.64
    Third7.07 - 8.441.16 to 1.51

    Low Levels : Low levels of T4 and T3 hormones suggest hypothyroidism. This can be caused by Hashimoto's disease, iodine deficiency, inflammation of the thyroid gland, or congenital factors.

    High Levels : Elevated levels of T4 and T3 indicate hyperthyroidism. This could be due to factors such as excess iodine in the diet, thyroid gland inflammation, Graves’ disease, or thyroid nodules.

    If any of your test parameters show abnormalities, it's recommended to consult with your doctor for better guidance and understanding of your condition.

    FAQs on TFT Blood Test

    Thyroid test price in Delhi starts at ₹450. However, this may vary depending on various factors. Orange Health Labs also offers home sample collection and faster delivery of the test results.

    Yes, Orange Health Labs provides home sample collection for the TFT test in Delhi. Our service ensures convenient sample collection at your doorstep within 60 minutes of booking, subject to slot availability.

    A Thyroid test, also known as TFT serves to evaluate the functionality of your thyroid gland and to identify underlying causes of conditions such as hyperthyroidism or hypothyroidism.

    No, fasting is not required before a Thyroid test.

    To book a Thyroid Checkup at home in Delhi or any other blood test or health checkup with us, follow these steps:

    Search for the desired test, such as the Thyroid test, on our platform.

    Select the test, review the prerequisites, enter your address, and confirm the booking by choosing a suitable time slot for sample collection.

    Our skilled eMedic will arrive at your home to collect the sample within your chosen time slot.

    The collected sample will be processed at our NABH/NABL-accredited and ICMR-approved labs.

    You will receive your reports via email or WhatsApp within 6, and they will also be accessible on our app.

    The reference range for all parameters in the TFT test is:

    TSH: 0.400 to 4.049 µIU/mL

    Total T4: 5.53 to 11.0 μg/dL

    Free T4: 0.78 to 2.1 ng/dL

    Total T3: 0.97 to 1.69 ng/dL

    Free T3: 2.77 to 5.27 pg/mL

    The time between booking the test and the eMedic arriving for sample collection is 60 minutes subject to availability of a slot. The process of sample collection can be completed within just a few minutes. Orange Health Labs also offers quick turnout time, such that you can get the test results within 6 hours of sample collection.

    The frequency of Thyroid testing varies for each individual. Consult with your doctor to determine the best testing schedule for you.

    The Thyroid test at home includes three main parameters: T3, T4, and TSH.

    The Thyroid Blood test does not require fasting.

    The 3 Thyroid tests are T3 and T4 total, and TSH.

    The normal TSH levels lie between 0.400 and 4.049 µIU/mL. However, they may differ as per age and other factors such as pregnancy.

    A TSH test measures thyroid-stimulating hormone levels, while a Thyroid Profile test typically includes measurements of multiple thyroid hormones, TSH, T3, and T4.

    Yes, it's important to note that TSH levels can fluctuate even without thyroid dysfunction. Temporary decreases in TSH levels may occur due to non-thyroid-related serious illnesses. Additionally, individuals over 80 may have higher TSH levels without thyroid issues.

    Primary blood tests for assessing thyroid function include TSH, T4, and T3.

    Thyroid test is available in Connaught Place, Chandni Chowk, Karol Bagh, Lajpat Nagar, South Extension, Greater Kailash, Hauz Khas, Saket, Vasant Kunj, Dwarka, Rohini, Pitampura, Janakpuri, Rajouri Garden, Mayur Vihar, Preet Vihar, Shahdara, Laxmi Nagar, Green Park, Safdarjung Enclave, Defence Colony, New Friends Colony, Kalkaji, Malviya Nagar, Nehru Place.

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