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GlossaryThyroid Function Tests

measure thyroid hormone levels to assess gland performance

Thyroid Function Tests (TFTs) are a series of blood tests used to evaluate how well the thyroid gland is working. These tests typically measure levels of thyroid hormones such as Thyroxine (T4), Triiodothyronine (T3), and Thyroid-Stimulating Hormone (TSH). Abnormal levels can indicate conditions like hypothyroidism or hyperthyroidism, which can affect various bodily functions, including metabolism and hair growth.

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research Biochemical Testing of the Thyroid: TSH Is the Best and Often Only Test Needed – A Review for Primary Care

115 citations, May 2016 in “Clinical Medicine & Research”

TSH is usually the only test needed to check thyroid function in primary care.

research Biotin and Thyroid Function Test: A Case Study

May 2022 in “Endocrine practice”

High-dose biotin can cause false thyroid test results; stop taking biotin two days before testing to avoid errors.

research How Biotin Induces Misleading Results in Thyroid Bioassays: Case Series

5 citations, May 2019 in “Cureus”

Taking biotin supplements can cause incorrect thyroid test results, leading to wrong diagnoses.

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community Please take a vitamin & hormone test

in Chat 256 upvotes 2 weeks ago

Checking vitamin and hormone levels is important for addressing hair loss, as deficiencies in vitamin D, zinc, and iron can affect hair growth. Treatments like finasteride, minoxidil, and vitamin supplements are used, but addressing deficiencies is crucial for effectiveness.

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