T3, T4, and TSH are key hormones and a hormone involved in thyroid function, commonly measured together in a thyroid function blood test to check for thyroid problems.
Understanding the Thyroid Hormones: T3, T4, and TSH
Here's a breakdown of each:
| Hormone | Full Name | Function |
|---|---|---|
| T3 | Triiodothyronine | One of the main thyroid hormones; it affects nearly every physiological process in the body, including growth and metabolism. |
| T4 | Thyroxine | Another primary thyroid hormone that is converted into T3 in the body. |
| TSH | Thyroid Stimulating Hormone | A hormone produced by the pituitary gland that stimulates the thyroid gland to release T3 and T4. |
How They Work Together
- The pituitary gland releases TSH.
- TSH signals the thyroid gland to produce and release T4 and T3.
- T4 is the predominant hormone produced, which the body then converts to the more active T3.
- These hormones work to regulate your metabolism and affect everything from growth to heart rate.
Why Measure These Hormones?
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A thyroid function test, often requested by health professionals, typically includes measuring TSH, T4, and T3 levels.
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These tests help diagnose thyroid disorders such as hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid).
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Abnormal levels of these hormones can indicate the need for further investigation and treatment.
- High TSH and low T4/T3: Suggestive of hypothyroidism (underactive thyroid)
- Low TSH and high T4/T3: Suggestive of hyperthyroidism (overactive thyroid)
Key Takeaways
- T3, T4 and TSH are all linked to thyroid function.
- T3 and T4 are thyroid hormones that regulate metabolic processes.
- TSH is a hormone that stimulates the thyroid to produce T3 and T4.
- Measuring these hormones can help detect and diagnose thyroid issues.
- According to the reference information provided, these hormones are measured together in a test.
