Thyroid Profile (T3, T4, TSH)
Thyroid · Blood
Available in:Hisar
Available at 2 labs
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24h
₹800₹449
₹400₹299
About this test
What the Test Is
The Thyroid Profile measures three key hormones that help regulate metabolism, growth, and energy:
- TSH (Thyroid‑Stimulating Hormone) – produced by the pituitary gland, it signals the thyroid to produce hormones.
- Free T4 (Thyroxine) – the active form of the main thyroid hormone.
- Free T3 (Triiodothyronine) – the active form of the secondary thyroid hormone.
Key Parameters
| Parameter | What it shows |
|---|---|
| TSH | Indicates pituitary stimulation of the thyroid; high levels suggest underactive thyroid (hypothyroidism), low levels suggest overactive thyroid (hyperthyroidism). |
| Free T4 | Measures the amount of active thyroxine; helps confirm thyroid function status. |
| Free T3 | Measures the amount of active triiodothyronine; useful when T4 is normal but symptoms persist. |
Why It Is Done
- Routine health check‑ups to screen for thyroid dysfunction.
- Evaluation of symptoms such as fatigue, weight change, heat/cold intolerance, hair loss, or menstrual irregularities.
- Monitoring treatment in patients with known thyroid disease.
- Investigating unexplained metabolic or cardiovascular symptoms.
Early Detection
This test can help identify signs of hypothyroidism or hyperthyroidism, but it does not diagnose on its own. A doctor interprets the result together with symptoms, history, and other tests.
What Abnormal Results May Mean
- High TSH with low or normal T4/T3 suggests hypothyroidism.
- Low TSH with high T4/T3 suggests hyperthyroidism.
- High T4/T3 with normal TSH may indicate subclinical hyperthyroidism or thyroid hormone resistance.
- Low T4/T3 with normal TSH may indicate subclinical hypothyroidism or non‑thyroidal illness.
Many factors—medications (e.g., amiodarone, steroids), pregnancy, recent illness, or lab variation—can affect results.
Who Might Be Advised to Get This Test
- Adults with symptoms of thyroid dysfunction.
- Pregnant women or those planning pregnancy.
- Patients on medications that affect thyroid hormones.
- Individuals with a family history of thyroid disease.
- People with other autoimmune conditions (e.g., type 1 diabetes, rheumatoid arthritis).
In short: The Thyroid Profile measures TSH, free T4, and free T3 to assess thyroid health and guide further care.
Used for detecting / monitoring
Before your test
No fasting is required for a Thyroid Profile. If you are also having a fasting blood test (e.g., fasting glucose), follow the fasting instructions for that test.
Procedure: A healthcare professional will draw a small amount of blood (about 5 mL) from a vein in your arm using a needle. The process takes less than 5 minutes and usually causes a brief pinch.
Precautions: No special precautions are needed. If you are on thyroid medication, take it as prescribed; do not skip doses before the test unless advised by your doctor.
Please confirm any specific preparation with your doctor or the lab. This information is general educational content and not a substitute for professional medical advice.
Sample type: Blood
Report parameter guide
T3
Measures the amount of triiodothyronine, an active thyroid hormone that regulates metabolism
Low: may indicate hypothyroidism, low metabolic rate, fatigue, weight gain
High: may indicate hyperthyroidism, increased metabolism, weight loss, anxiety
T4
Measures the amount of thyroxine, a precursor hormone that is converted to T3 in tissues
Low: may indicate hypothyroidism, low metabolic rate, fatigue, cold intolerance
High: may indicate hyperthyroidism, increased metabolism, heat intolerance, palpitations
TSH
Measures thyroid-stimulating hormone released by the pituitary to regulate thyroid hormone production
Low: may indicate hyperthyroidism, excess thyroid hormone, pituitary adenoma
High: may indicate hypothyroidism, low thyroid hormone levels, pituitary dysfunction