What is the normal range for T4?
A normal Total T4 level in adults ranges from 5.0 to 12.0μg/dL. A normal Total T3 level in adults ranges from 80-220 ng/dL. Free T3 assays are often unreliable and not routinely used to assess thyroid function.
What does it mean if my 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 good level for T4?
Normal levels in adults In adults, normal levels of total T4 range from 5–12 micrograms per deciliter (mcg/dl) of blood. Normal levels of free T4 range from 0.8–1.8 nanograms per deciliter (ng/dl) of blood. Normal T4 levels also vary across trimesters of pregnancy.
How high can free T4 go?
The normal range for free T 4 in adults is 0.8 to 1.8 nanograms per deciliter (ng/dL). A level of free T 4 that is higher than normal could mean you have an overactive thyroid. Conditions associated with hyperthyroidism include Graves disease, an autoimmune disorder.
How can I raise my T4 levels?
Several health studies have shown that T3 and T4 hormone levels increase with exercise. Beyond helping to stimulate thyroid production, exercise also helps to counteract many of the side effects of hypothyroidism such as gaining weight, loss of muscle, depression, and low energy levels.
Why is free T4 important?
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. T3 and T4 help to control how your body stores and uses energy (metabolism). The thyroid hormones also help control many of your body’s other processes.
What is the normal range for a T4 blood test?
The normal reading for the Total T4 is considered to be between 4 and 11. However, the T4 level alone does not indicate whether you have a thyroid problem. The test must be combined with a test for TSH (thyroid stimulating hormone).
What causes high T4 levels?
The causes for elevated T4 and T3 levels include Graves’ Disease, an autoimmune disease in which the thyroid is attacked and responds by becoming overactive; thyroiditis (inflammation or infection of the thyroid for reasons doctors do not understand); and thyroid nodules, which are growths on the thyroid.
What does it mean if your T4 is high?
In general, high free T4 results may indicate an overactive thyroid gland ( hyperthyroidism ), and low free T4 results may indicate an underactive thyroid gland ( hypothyroidism ). The test results alone are not diagnostic but will prompt the healthcare practitioner to perform additional testing to investigate the cause of the excess or deficiency.
What does high T4 levels mean?
What does high T4 level mean? It can mean: An elevated level of thyroid hormone, either due to hyperthyroidism or thyroid inflammation. It can be falsely elevated by estrogen therapy. Other thyroid tests are more reliable. The T3 ( liothyronine) you’re receiving is potentially dangerous and should not be taken.