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Persistent fatigue can have various underlying factors. Comprehensive thyroid assessment may provide valuable insights beyond standard TSH screening. Thyroid function involves multiple hormones and conversion processes: TSH (pituitary signaling) Free T4 and T3 (thyroid hormones) Reverse T3 (conversion indicators) Thyroid antibodies (autoimmune markers) TSquared Health Signature Membership tests 170+ biomarkers including comprehensive thyroid panels. AI-supported analysis identifies patterns across markers, and physicians provide interpretation to help you understand your results. Tested twice yearly with physician-led interpretation.