Normal lab range vs optimal: What science shows for men
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 29, 2025 · 15 min read
A “normal” lab range is a population-based reference interval (often the middle 95%); “optimal” is the range that best aligns with your symptoms, function, and risk profile. Many men are told their blood work is “normal” even though they feel tired, softer, and off their game. Understanding optimal vs normal lab ranges can turn a ...