- Free T3 (FT3) Test:
- Purpose: The Free T3 test measures the levels of triiodothyronine (T3), an active thyroid hormone, that is not bound to proteins in the blood. T3 plays a crucial role in regulating metabolism, energy production, and overall growth and development.
- Procedure: A blood sample is taken, and the serum is tested to determine the concentration of unbound T3.
- Normal Range: Typically falls within 2.3 to 4.2 picograms per milliliter (pg/mL).
- Interpretation: Elevated or decreased FT3 levels may indicate hyperthyroidism or hypothyroidism, respectively.
- Free T4 (FT4) Test:
- Purpose: The Free T4 test measures the levels of thyroxine (T4), another thyroid hormone that plays a key role in regulating metabolism, energy levels, and body temperature. FT4 represents the unbound, active form of T4.
- Procedure: A blood sample is collected and analyzed to determine the concentration of unbound T4 in the serum.
- Normal Range: Typically falls within 0.9 to 1.8 nanograms per deciliter (ng/dL).
- Interpretation: Abnormal FT4 levels may indicate hyperthyroidism, hypothyroidism, or other thyroid disorders.
- Thyroid Stimulating Hormone (TSH) Test:
- Purpose: The TSH test measures the levels of thyroid-stimulating hormone, which is produced by the pituitary gland to regulate the thyroid’s hormone production.
- Procedure: A blood sample is collected, and the serum is tested to determine the concentration of TSH.
- Normal Range: Typically falls within 0.4 to 4.0 milliunits per liter (mU/L).
- Interpretation: Elevated TSH levels may suggest an underactive thyroid (hypothyroidism), while low TSH levels may indicate an overactive thyroid (hyperthyroidism).
These tests are often conducted together to provide a comprehensive assessment of thyroid function and help healthcare providers diagnose and manage thyroid disorders effectively. Abnormalities in these hormone levels can provide valuable insights into the underlying thyroid condition and guide appropriate treatment.
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