What if my T3 and T4 are normal but TSH is high?
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.
What does it mean when TSH is high and T4 is normal?
A normal TSH and normal T4 show a normal thyroid. A low TSH and high T4 generally means an overactive thyroid. A high TSH and low T4 means an underactive thyroid. A low TSH and low T4 mean low thyroid function because of another problem, such as with the pituitary gland or hypothalamus of the brain.
Is T3 and T4 more important than TSH?
Because T4 is converted into another thyroid hormone called T3 (triiodothyronine), free T4 is the more important hormone to measure. Any changes show up in T4 first.
What does it mean if your T3 is low but your TSH and T4 are normal?
Subclinical hyperthyroidism is when you have low levels of TSH but have normal levels of T3 and T4. If you’re experiencing symptoms of subclinical hyperthyroidism, your doctor can use a series of blood tests to come to a diagnosis.
What’s the difference between Hashimoto’s and hypothyroidism?
Hypothyroidism is a problem with your thyroid gland; Hashimoto’s is a problem with your immune system. In Hashimoto’s– as in all autoimmune diseases– the immune system gets confused and mistakenly attacks a part of your own body, kind of the metabolic equivalent of “friendly fire”.
What is the normal range of T3 and T4?
Ranges between laboratories will vary with the upper limit being between 4 to 5. If your level is higher than this, chances are you have an underactive thyroid. In general, T3 and T4 levels increase in pregnancy and TSH levels decrease.
What is the normal range of TSH?
Normal TSH ranges can vary widely, depending on a person’s age, sex, and body weight. Reference ranges remain controversial, but for most people, the normal range falls between 0.4 and 4.0 mU/l. Having an overactive or underactive thyroid can cause health issues that interfere with daily life.
What does low TSH and high T3 and T4 mean?
The exact opposite is true when the TSH is low. A low TSH is an indicator that your body has enough T3 and T4 in the body and so your pituitary responds by reducing the production of TSH from the pituitary gland. Hyperthyroidism = excessive thyroid production = high T3 and/or T4 levels of thyroid hormone in the blood = low TSH.
What causes elevated TSH levels?
Causes for elevated TSH include Hashimoto’s Thyroiditis, an autoimmune condition in which the body’s own immune system attacks the thyroid; pregnancy; and pituitary gland disorders.