Thyroid Profile ( T3,T4,TSH )

A thyroid profile blood test is a group of blood tests used to check how well your thyroid gland is working. The thyroid is a small, butterfly-shaped gland in the neck that controls metabolism, energy, growth, and body temperature.

What does a thyroid profile usually include?

1. TSH (Thyroid Stimulating Hormone)

   • Made by the pituitary gland

   • Tells the thyroid how much hormone to produce

   • High TSH → thyroid may be underactive (hypothyroidism)

   • Low TSH → thyroid may be overactive (hyperthyroidism)

2. T3 (Triiodothyronine)

   • An active thyroid hormone

   • Helps regulate heart rate, body temperature, and metabolism

   • Often elevated in hyperthyroidism

3. T4 (Thyroxine)

   • Main hormone produced by the thyroid

   • Controls how fast the body uses energy

   • Can be measured as Total T4 or Free T4 (Free T4 is more accurate)

Why is a thyroid profile done?

• To diagnose hypothyroidism or hyperthyroidism

• To investigate symptoms like:

  • Weight gain or loss

  • Fatigue

  • Hair loss

  • Irregular heartbeat

  • Mood changes

• To monitor thyroid treatment or medication

How is the test done?

• A small blood sample is taken from a vein in the arm

• Usually no fasting is required (unless advised by a doctor)

Is it safe?

Yes. It is a simple, safe blood test with minimal risk.