February 2024 in “International Journal of Research in Dermatology” Thyroid tests may not be needed for all vitiligo and alopecia areata patients unless thyroid disease symptoms appear.
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April 2021 in “Nepal journal of dermatology, venereology & leprology” Iron profile tests are recommended for women with hair loss, as haemoglobin levels alone are not reliable.
September 2025 in “Online Türk Sağlık Bilimleri Dergisi” Low zinc and folate levels are linked to hair loss in children.
May 2022 in “Endocrine practice” High-dose biotin can cause false thyroid test results; stop taking biotin two days before testing to avoid errors.
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May 2016 in “Clinical Medicine & Research” TSH is usually the only test needed to check thyroid function in primary care.