normal thyroid levels

What Are Normal Thyroid Levels?

Having normal thyroid levels is vital to overall health. If your thyroid levels are off, your whole body could be affected as well as your mental health. Understanding what is considered a normal level of thyroid hormones in the body can help you better monitor any potential changes.

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What Is The Thyroid?

The thyroid is a butterfly-shaped gland located in your neck and is part of the endocrine system. It uses iodine to produce two different hormones, thyroxine (T4) and triiodothyronine (T3). These hormones are crucial for regulating metabolism and other bodily processes.

Measuring The Hormones

Both hormone levels can be tested using a simple blood test and should be monitored regularly. Your doctor will measure the levels of T3, T4, and the thyroid stimulating hormone (TSH).

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Normal Thyroid Levels for T4

The normal range for T4 levels is considered to be between 4.5 and 12 micrograms per deciliter (mcg/dL).

Normal Thyroid Levels for T3

The normal range for T3 levels is between 80 and 200 nanograms per deciliter (ng/dL).

Normal Thyroid Levels For TSH

The normal range for TSH is between 0.5 and 5.0 milli-international units per liter (mIU/L).

Signs of Low Thyroid Levels (Hypothyroidism)

Signs of low thyroid levels (known as hypothyroidism) may include

  • Fatigue
  • Weight gain
  • Depression
  • Hair loss
  • Digestive issues
  • Joint pain

Signs Of High Thyroid Levels (Hyperthyroidism)

Signs of high thyroid levels (known as hyperthyroidism) may include:

  • Weight loss
  • Anxiety
  • Diarrhea
  • Irregular heartbeat
  • Visible eyes
  • Weakness


If you experience any of these symptoms it is important to get tested for both T4 and T3 thyroid levels to determine if you have hypo- or hyperthyroidism. Knowing what is considered normal thyroid levels can help you better understand and monitor any potential changes.

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