Common mistakes around TSH Labor

Common mistakes around TSH lab testing include: (1) Not drawing blood at a consistent time of day (TSH has a circadian rhythm, peaking in early morning). (2) Taking biotin (vitamin B7) before the test, which can interfere with immunoassays. (3) Interpreting TSH without considering age, thyroid medication, or other thyroid markers (fT3, fT4). (4) Assuming a single TSH value gives a complete thyroid picture. (5) Ignoring lab-specific reference ranges. Evidence is based on clinical practice and endocrinology guidelines. The provided context does not address TSH lab testing.