High TSH and low FT4 (and FT3) This combination of TFTs suggests primary hypothyroidism and, in the UK, is most usually the result of autoimmune thyroiditis (Hashimoto’s disease or atrophic thyroiditis) or follows radioiodine or thyroidectomy. 2 …

2022年10月3日 · Having high TSH and low T4 levels usually indicates hypothyroidism, an underactive thyroid due to a primary thyroid problem. This is a lack of T4 production due to an issue with your thyroid that’s causing your pituitary gland to release excess TSH to try to stimulate your thyroid into making more T4.

2023年9月5日 · 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 …

2024年10月11日 · High levels of fT4 typically indicate hyperthyroidism, whereas low fT4 levels suggest hypothyroidism (13). T3 is the active thyroid hormone that directly influences metabolic processes within cells.

Excessive T4 -- whether produced by the thyroid gland or caused by too much thyroid hormone replacement medication -- can lead to menstrual irregularities. Excess thyroid hormone interferes with the production and release of the hormones that control the menstrual cycle, typically leading to irregular periods or a temporary cessation of ...

2025年1月18日 · Accurate diagnosis of high FT3 and FT4 levels requires a stepwise approach, combining lab tests, imaging, and clinical evaluation. Here’s how healthcare providers identify hyperthyroidism and its root causes.

2024年5月16日 · If your Free T4 level is high in your thyroid test results, it can mean an overactive thyroid or hyperthyroidism. If your Free T4 is low in your thyroid test results, it can mean an under-active thyroid or central hypothyroidism.

If the TSH level is low and the FT4 result is high this suggests an overactive thyroid (hyperthyroidism) that requires treatment. If the TSH level is slightly raised but the FT4 level is still within the normal reference range this is called subclinical hypothyroidism or mild thyroid failure.

• A low TSH level with a high FT4 level and a high FT3 level indicates hyperthyroidism (overactive thyroid) • Abnormal TSH levels together with normal FT4 levels indicate you may be at risk of developing a thyroid disorder (subclinical thyroid disease)

High FT3 and FT4 levels: If these levels are elevated, it usually indicates hyperthyroidism. Symptoms of hyperthyroidism include weight loss, rapid heart rate, nervousness, anxiety, and sweating. By evaluating these test results, healthcare providers can accurately diagnose thyroid disorders and determine the appropriate treatment.