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When the thyroid gland becomes inefficient such as in early hypothyroidism, the TSH becomes elevated even though the T4 and T3 may still be within the "normal" range.

Is T3 and T4 more important than TSH?

Across many clinical studies it seems clear that the physiologic effects of low or high thyroid function correlate much more strongly to free T4 and free T3 levels than to TSH levels. In fact, correcting for changes in T4 and T3 levels there appeared to be no correlation between TSH level and body function.

What does it mean if TSH is high and T3 and T4 are low?

A low level of TSH and high levels of T3 and/or T4 usually means you have an overactive thyroid.

Do you treat high TSH with normal T4?

Most patients who have a mildly elevated TSH have a normal free thyroxine (T4) level. The treatment of such patients is controversial, particularly when they have few or no symptoms and no other clinical evidence of thyroid disease.

What happens when only TSH is high?

What do the results mean? High TSH levels can mean your thyroid is not making enough thyroid hormones, a condition called hypothyroidism. Low TSH levels can mean your thyroid is making too much of the hormones, a condition called hyperthyroidism.

What are the symptoms of high T3?

Possible Health Risks of High T3

• Tiredness.
• Tremors.
• Anxiety.
• Trouble sleeping.
• Weight loss.
• Heat intolerance.
• Rapid heartbeat.
• Increased thirst.

Jan 13, 2021

What happens if T3 is high?

High T3 levels can indicate several conditions, including hyperthyroidism and thyrotoxicosis (excess circulating hormones). In some cases, they can signify thyroid cancer, but this disease does not often cause abnormal T3 levels. Thyrotoxicosis and thyroid cancer are rare, so hyperthyroidism is more commonly the cause.

What does it mean if TSH is normal but T3 is high?

If your results show high total T3 levels or high free T3 levels, it may mean you have hyperthyroidism. Low T3 levels may mean you have hypothyroidism, a condition in which your body doesn't make enough thyroid hormone. T3 test results are often compared with T4 and TSH test results to help diagnose thyroid disease.

What is considered a dangerously high TSH level?

Experts don't agree on which TSH levels should be considered too high. Some suggest that TSH levels of over 2.5 milliunits per liter (mU/L) are abnormal, while others consider levels of TSH to be too high only after they have reached 4 to 5 mU/L.

Can you still have hypothyroidism with normal TSH levels?

Can you have hypothyroidism with normal TSH? Yes, it is possible to have hypothyroidism and normal TSH levels in the blood. Most people with hypothyroidism have high TSH because their thyroid gland is not releasing enough hormones. In response to this, the body produces more TSH in order to get the thyroid to work.