Sex hormone-binding globulin

Understanding sex hormone-binding globulin (SHBG) and its critical role in regulating free testosterone levels. Learn how SHBG impacts hormone availability, what your levels mean, and strategies to optimize your hormonal balance.

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The essentials for sex hormone-binding globulin — then explore the latest posts below.

Function Health testosterone results: What “out of range” really means and what to do next

Dr. Susan Carter, MD: Endocrinologist & Longevity Expert

Feb 09, 2026 · 13 min read

An “out of range” testosterone result means your value fell outside that lab’s reference interval, not that you have hypogonadism. The next step is to repeat a morning total testosterone and add confirmatory labs (free testosterone with SHBG, plus LH/FSH) interpreted alongside symptoms before deciding on treatment. “When a lab report says ‘normal’, it mostly ...

What is sex hormone binding globulin? How SHBG levels shape testosterone in men

Dr. Alexander Grant, MD, PhD: Urologist & Men's Health Advocate

Dec 09, 2025 · 14 min read

Sex hormone binding globulin is a liver made protein that binds testosterone and other sex hormones, and SHBG levels help predict how much testosterone is actually available to your tissues. If you have low testosterone symptoms but “normal” total testosterone, SHBG is often the missing piece that explains why you still feel off. “Most guys ...