You might have hypothyroidism—even if your thyroid blood tests appear normal Do you struggle with fatigue, weight gain, hair loss, constipation, cold hands and feet, brain fog, or other common symptoms of hypothyroidism—yet your thyroid labs fall within the so-called "normal" range? In Test Your Thyroid Function , biochemist Dr. Benedicte Lerche, MSc, PhD, explains why standard thyroid testing often misses true hypothyroidism at the cellular level—and what a more accurate evaluation of thyroid function looks like. Drawing on the work of thyroid expert Dr. Ray Peat, she presents a precise, physiology-based approach to thyroid health and laboratory interpretation. Using Optimal Values Rather Than Broad Reference Ranges, You’ll Learn How To Interpret: TSH T4 T3 Reverse T3 (rT3) Thyroid antibodies Learn How To Monitor Thyroid Health At Home Using: Body temperature - Pulse rate - Symptom patterns Key Topics Covered: How the thyroid gland regulates metabolism - How T3 drives cellular energy production - Why measuring T3 is essential for diagnosing hypothyroidism - Common and overlooked symptoms of hypothyroidism - How stress suppresses thyroid function - The anti-metabolic effects of reverse T3 (rT3) - Why the T4-to-T3 conversion often fails - Clear guidance on Hashimoto's thyroiditis - The limitations of relying solely on TSH - Optimal vs. "normal" thyroid lab ranges - How to prepare for your thyroid blood tests - The role of pulse and temperature in evaluating thyroid function Helpful Thyroid Tables & Tracking Tools: Side-by-side comparison of optimal and standard thyroid lab values - Pulse and temperature ranges linked to healthy thyroid function - Comprehensive hypothyroid symptom checklist - Simple tracking templates for personal use Who This Book Is For: This book is for individuals who continue to experience hypothyroid symptoms despite being told their lab results are "normal." It is especially helpful for those with Hashimoto's thyroiditis, persistent fatigue, unexplained weight gain, or suspected low thyroid function who want deeper insight and practical guidance. If you are ready to move beyond confusion and take control of your thyroid health at a physiological level, this book provides the clarity, science, and tools you need. Part of Dr. Benedicte Mai Lerche’s Healing Metabolism series: How I Overcame Hypothyroidism - Test Your Thyroid Function - How to Boost Metabolism With Food - How to Use Thyroid Medication