What T4 levels indicate hypothyroidism?
TSH > 4.0/mU/L with a low T4 level indicates hypothyroidism. If your TSH is > 4.0 mU/L and your T4 level is normal, this may prompt your physician to test your serum anti-thyroid peroxidase (anti-TPO) antibodies.
Is T4 high or low in hypothyroidism?
High levels of any of these tests (total T4, free T4, or free T4 index) may indicate an overactive thyroid, also known as hyperthyroidism. Low levels of any of these tests (total T4, free T4, or free T4 index) may indicate an underactive thyroid, also known as hypothyroidism.
What is the TSH range for hypothyroidism?
A normal range for TSH in most laboratories is 0.4 milliunits per liter (mU/L) to 4.0 mU/L. If your TSH is higher than 4.0 mU/L on repeat tests, you probably have hypothyroidism. Your doctor may also order a T4 test.
What if T4 is high and TSH 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.
What happens if only T4 is high?
A high level of T4 indicates an overactive thyroid (hyperthyroidism). Symptoms include anxiety, unplanned weight loss, tremors, and diarrhea. Most of the T4 in your body is bound to protein. A small portion of T4 is not and this is called free T4.
What is a bad T4 level?
In adults, the typical range for free T4 is between . 9 and 2.4 nanograms per deciliter. Total T4 tends to vary more with age. An abnormally high T4 level may indicate hyperthyroidism, thyroiditis, or goiter. It may lead to additional tests for Graves’ disease.
What are the normal levels of thyroxine?
The normal acceptable level of thyroxine is in between 4.5 micrograms to 11.2 micrograms per deciliter of blood. If the amount of thyroxine hormone falls lower than 4.5 micrograms of thyroxine per deciliter of blood is considered low level, and if the amount is higher than 11.2 micrograms per deciliter of blood, then that is considered high level.
What does high levels of thyroxine mean?
Having high thyroid levels means that at the time the levels were assessed (through a blood test), the thyroid was producing too much thyroxine (T4) and/or triiodothyronine (T3), the two hormones that constitute the “thyroid hormone.”. Having high thyroid levels is indicative of an underlying health condition…
What are the effects of high thyroxine levels?
Weight loss,eye or vision changes.
What can too much thyroxine do to the body?
If your body releases too much thyroxine, you will suffer a condition called thyrotoxicosis . This can cause a goiter, which is a swelling of the neck because of an enlarged thyroid gland. Thyrotoxicosis can also cause menstrual irregularities, an increase in bowel movements, weight loss, heat intolerance, fatigue, and irritability .