Normal Thyroid Levels

The thyroid gland is one of the endocrine systems which regulate the hormonal secretion in our body. This gland looks like a butterfly and lies in the outer region of our neck. The thyroid gland produces thyroid hormones known as T3 and T4. The ratio of the presence of T3 is t T4 when they are released into our blood is somewhere around 20:80. The difference between t3 and t4 is that T4 is converted into the T3 as and when required by our body. These hormones are capable of normal functioning when they are in their respective T3 normal range and T4 levels normal range. Moreover, The key role of the thyroid hormones is to help in metabolism. Likewise, it is pivotal to maintain normal thyroid levels.

It is important and necessary for our body to maintain Normal Thyroid Levels, in order to function normally. If by any chance you are facing a change in the thyroid function or there is a hormonal imbalance of the thyroid hormones like T3 or T4, then be prepared there is a havoc on its way. That is why it is frequently said that optimal thyroid levels are to be maintained at all times. The thyroid hormones T3 and T4 are controlled by the hormone secreted by the pituitary gland. This hormone is known as Thyroid Stimulating Hormone(TSH). TSH levels range is also important in determining the thyroid gland function in the thyroid test results. Forthwith, that you got an idea on the thyroid gland and its functions, let us embark on the journey of learning about normal thyroid levels. 

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normal thyroid levels

What are Normal Thyroid Levels?

The levels of thyroid hormones and metabolism are directly proportional. I think you know what is meant by directly proportional. The excess of these hormones (high thyroid levels) leads to high metabolism which often results in a thyroid disorder known as hyperthyroidism. Whereas the dearth (low thyroid levels) of the thyroid hormones from their normal thyroid levels lead to hypothyroidism. (slow metabolism)

If you presume a change in the normal thyroid levels, better consult an endocrinologist. If they are on your side and suspect something is wrong with your thyroid gland, then they will recommend you to a thyroid test. This thyroid test will give a detailed information on the T4, free t4 range, T3 and free T3 thyroid. Next time you see your report of T3 or t4 blood test you will get a sense on the normal thyroid levels and the fault in your thyroid range.

Hoping you got something useful about the normal thyroid levels, let’s proceed further into the darker and deepest side of normal thyroid levels. As you proceed further, be aware of the hard scientific language used. (Don’t worry, I’m just kidding you can always find the meaning of the hard times in the key below.) With a simple blood test t3 t4 TSH values can be known.

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Normal Thyroid Levels

Normal Thyroid Levels

Recommended thyroid hormone levels or as they are commonly called normal thyroid levels remain constant for every person. You won’t find a huge difference in the normal thyroid levels. But it is not a foolish thing to expect a slight difference between every other person. That is why we refer this normal thyroid levels as thyroid range.

Normal T3 levels

Triiodothyronine (T3) as we have already discussed, is only produced in meager amounts compared to the T4. But we can’t overlook the T3 because of the small quantity, as it is helpful for metabolism. T4 is generally converted into T3 with the help of thyroglobulin. The total t3 normal range is commonly between 80 to 220. If the test results show that the T3 levels are more than 220, it is hyperthyroidism condition. Whereas, below is a sign of hypothyroidism. There seem to endure normal thyroid levels, when the free t3 normal range is between 2.3 to 4.2. 

Normal T4 levels

Hormone T4 which is produced by the thyroid gland in bulk is also known as thyroxine. This hormone is converted into T3 in the liver. Some of it remains and circulates the body in the blood as Free T4. The total converted one and the free T4 is known as Total T4. The t4 normal range is between 4.6 to 12. When the T4 levels lie in this range, it indicates that thyroid is functioning normally and there exist normal thyroid levels. But sometime you may recognize high TSH normal t4 and all odds. The normal free t4 levels lie in the range of 0.7 to 1.9. 

Normal TSH levels 

Actually, the normal TSH t4 levels change from every lab or clinic. This is because everyone uses a different scale. The old one and widely accepted one is 0.5 to 5.5. This scale is followed by some labs while others follow the former one. Apart from the difference in scales in different labs, an interesting thing about TSH levels is that they fluctuate. The peak of the TSH level is observed during the evening and remains the same until midnight. We can witness the same level at 06:00 am in the morning and at 06:00 pm in the evening.

[Quick Read] Complete details about Normal TSH levels

Normal TSH levels for females

I’m not sure if there’s a difference in thyroid lab ranges based on the gender. Thyroid function doesn’t have one set value, but there are various components of thyroid levels. But you can observe the change in the normal thyroid levels in a female when she is pregnant. So, automatically, there will be a slight deviation from the normal thyroid levels for females, which is actually the same as everyone. As mentioned earlier. During Pregnancy the thyroid TSH levels fluctuate. The TSH thyroid levels high and low during the different trimester. (I think you trimester means 3 months.)

  • 1st trimester (0-3 months) : 0.3- 4.5 mIU/L
  • 2nd trimester (3-6 months) : 0.3 – 4.6 mIU/L
  • 3rd trimester (6-9 months) : 0.8 – 5. mIU/L

Thyroid levels chart

For your easy reference and to save your self from the embarrassment of going through the difficulty of reading and understanding the complicated scientific terms and all, here is the data all presented well in a neat table. Hope this helps!

normal thyroid levels
Thyroid level Chart

How to Interpret the Thyroid Test Results at Home?

Given below are the helpful insight and knowledge of the normal thyroid levels and the changes in the normal thyroid levels. It also encases and how it would affect the human body. With these references, you can easily, interpret your thyroid test results.

  • TSH (Thyroid Stimulating Hormone) levels normally are considered to be normal thyroid levels if they are between the range of 0.5 to 6. But with the updated TSH levels chart, this TSH normal range by age is modified slightly. Now, the new normal TSH levels are 0.3 to 3.0.
  • If in case the TSH level range happens to be lower than the lower Tsh values of 0.3, then this condition is medically termed as Hyperthyroidism.
  • Whereas if the TSH lab values more than the other end of the extreme i.e, if more than 3, then it is obvious that you are suffering from Hyperthyroidism. 
  • Hypothyroidism can also be determined by a number of changes in the normal thyroid levels.
    • For instance, high TSH low T4 is observed.
    • The second one is the total T3 range is below 80. (the normal total t3 normal range is 80 to 220)
    • And finally, if the free T4 levels are below the free t4 normal range of 0.7 then it is also called as an underactive thyroid.
  • Low TSH low T4 represent the pituitary tumor, which requires immediate attention as it might be secondary hypothyroid

Now, that you acquired the knowledge on the normal thyroid levels and thyroid normal range, take a look at other thyroid issues and thyroid test. Check out the My Thyroid Problems website to get the complete and useful information on the thyroid gland.


Word Meaning
Hypothyroidism Enough Thyroid hormone is not produced by the thyroid gland
Goiter Abnormal enlargement of the thyroid gland (swollen thyroid gland)
Thyroid Hormones T3, T4, and Calcitonin
Thyroxine T4 hormone produced by the thyroid gland
T3 Triiodothyronine, a hormone produced by the thyroid gland

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