December 2020 in “Journal of Drugs in Dermatology” The document concludes that more research is needed to confirm if blood tests for things like iron and vitamin D are helpful for hair loss from Telogen effluvium.
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April 2023 in “World Journal of Clinical Cases” Test liver enzymes and triglycerides every 5-6 months, and cholesterol levels in the first two months for acne patients on isotretinoin.
June 2024 in “British Journal of Dermatology” Dermatologists vary widely in testing practices for alopecia areata, often exceeding guideline recommendations.
July 2019 in “Journal of The American Academy of Dermatology” Lab tests for female hair loss have unclear usefulness; consider based on symptoms.
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February 2022 in “Journal of the American Academy of Dermatology” Taking biotin supplements can be risky and often lacks evidence of effectiveness for skin, hair, and nail issues.