How to prepare for TSH Labor

Preparing for a TSH lab test (thyroid-stimulating hormone) follows standard clinical protocols, not DNA-based guidance. Key recommendations: blood draw in the morning (7–9 AM) due to TSH's circadian rhythm (highest in early morning). Fasting is not mandatory, but a high-fat meal can interfere; a light meal or fasting for 8–12 hours is often advised. Crucially, biotin supplements (common in hair, skin, and nail products) can falsely lower or raise TSH levels; stop biotin at least 3–5 days before the test. Thyroid medications (e.g., levothyroxine) should be taken after the blood draw, not before. These recommendations are based on clinical practice and laboratory guidelines, not on genetic tests. MyBody-X DNA results do not provide actionable information for TSH preparation. If in doubt, consult your physician.