Medicine
Thyroid Function Tests and Interpretation Pitfalls
Quick fact
Taking biotin (vitamin B7) supplements can falsely raise or lower thyroid test results, leading to misdiagnosis. It's recommended to stop biotin 2–3 days before testing.
Why this is interesting
Your thyroid test came back 'abnormal'—but is it really your thyroid? In some cases, the test lies, and the truth is hiding in the assay tube.