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Information that indicates if your result is normal or abnormal, or high or low. What are normal free T4 levels? Normal levels of free T4 vary based on your age. In general, normal ranges of free T4 for healthy people include: Children up to 5 years old: 0.8 – 2.8 nanograms per deciliter (ng/dL). Children 6 to 15 years old: 0.8 – 2.1 ng/dL.
If so, then you may be suffering from low T4 or hypothyroidism. This post will teach you what you need to know about T4 testing including the symptoms associated with low T4, what causes this condition, and how to treat it: What Does your T4 Level Mean? What does T4 actually measure in your body?
Tests measuring free T4 – either a free T4 (FT4) or free T4 index (FTI) – more accurately reflect how the thyroid gland is functioning when checked with a TSH. The finding of an elevated TSH and low FT4 or FTI indicates primary hypothyroidism due to disease in the thyroid gland.
If the results show that TSH is high and T-4 is low, then the diagnosis is hypothyroidism. In some cases, the thyroid hormone T-3 may be measured as well. If the second test shows high TSH but T-4 and T-3 are in the standard range, then the diagnosis is a condition called subclinical hypothyroidism.
That's mainly because people with an underactive thyroid tend to develop high levels of low-density lipoprotein (LDL) cholesterol — the "bad" cholesterol. Peripheral neuropathy. Hypothyroidism that goes without treatment for a long time can damage the peripheral nerves.
This thyroid test analyzer will help you understand your TSH, T3, T4, and other thyroid function test results. Select a test and enter your lab value to learn more.
A low FT 4 level indicates clinical hypothyroidism, specifically autoimmune hypothyroidism (i.e., Hashimoto thyroiditis) if the TPO antibody test result is elevated).
A T4 blood test measures your thyroxine hormone levels, which can show how well your thyroid is working. Low T4 levels are called hypothyroidism, and high T4 levels are called hyperthyroidism.
An abnormally high free T4 level may indicate hyperthyroidism, thyroiditis, or goiter. It may also lead to additional tests for Graves' disease. An abnormally low free T4 level can point to hypothyroidism, a problem with your pituitary gland, malnutrition or iodine deficiency, or other illness.
Only about 1%–2% of T4 in the blood is unattached (“free”) and can get into cells. The free T4 and the free T4 index are both simple blood tests that measure how much unattached T4 is in the blood and available to get into cells.