What is the clinical depth on specific biomarkers?

TSH: The First-Line Marker for Thyroid Function — A Practitioner Reference

Thyroid stimulating hormone (TSH) is the most sensitive single marker of thyroid function in primary care and a foundational test across endocrinology, women's health, and functional medicine. This spotlight covers the physiology, reference range debates, interpretation pitfalls, and where TSH fits alongside Free T4, Free T3, and thyroid antibodies.