Understanding TSH

Understanding TSH, T3, and T4 🧐🩺👇👇👇👇👇

TSH, T3, and T4 are blood tests used to evaluate thyroid gland function. They help diagnose thyroid disorders such as Hypothyroidism and Hyperthyroidism.

📌TSH (Thyroid-Stimulating Hormone)

 • Produced by: Pituitary gland

 • Function: Stimulates the thyroid gland to produce T3 and T4.

 • Normal range: ~0.4–4.0 mIU/L (may vary by lab)

Interpretation

 • High TSH: Usually indicates hypothyroidism (thyroid underactive).

 • Low TSH: Usually indicates hyperthyroidism (thyroid overactive).

📌T3 (Triiodothyronine)

 • The active thyroid hormone that affects body metabolism.

 • Controls:

 • Heart rate

 • Body temperature

 • Energy use

Normal Range

 • Total T3: ~80–200 ng/dL

Increased In

 • Hyperthyroidism

 • Thyroid storm

Decreased In

 • Hypothyroidism

 • Severe illness

📌T4 (Thyroxine)

 • The main hormone produced by the thyroid gland.

 • Converted in the body to T3.

Normal Range

 • Total T4: ~5–12 µg/dL

Increased In

 • Hyperthyroidism

Decreased In

 • Hypothyroidism

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