Numbers can be misleading
Lab reports show a wide “normal” range for testosterone. Many men fall within that range but still feel exhausted, irritable or weak. Urologist Dr. John Smith notes that some men are told they have normal testosterone levels in the 400–600 range yet still experience symptoms. Increasing testosterone to the upper end of normal doesn’t necessarily improve how you feel.
The importance of free testosterone and SHBG
Total testosterone counts everything in your bloodstream, but only free testosterone is available for use. High levels of sex hormone‑binding globulin can tie up testosterone, lowering the free portion. Two men with the same total testosterone can feel very different if one has high SHBG. Measuring free testosterone and SHBG helps explain why “normal” numbers don’t always match how you feel.
Story: David’s puzzle
David, a 44‑year‑old engineer, felt unmotivated and struggled to build muscle despite training. His doctor reassured him when his total testosterone was average. Months later another clinician measured his free testosterone, SHBG and estradiol. David’s free testosterone was low, and his SHBG was high. Adjusting his diet, lowering stress and addressing thyroid function improved his free testosterone without artificially pushing his total to the top of the range.
Conventional versus functional mindsets
Conventional medicine may treat low testosterone by prescribing hormone therapy until numbers sit comfortably in the normal range. As Dr. Smith explained, raising your numbers isn’t guaranteed to make you feel better. Functional medicine focuses on why symptoms occur despite normal lab values. Practitioners look at free testosterone, SHBG and related hormones. They may recommend diet changes, weight management, stress reduction and, when needed, a more comprehensive approach to testosterone replacement therapy tailored to your biology.
Summary
If you still feel unwell despite “normal” lab numbers, don’t settle. Ask your provider to check free testosterone and SHBG. The right evaluation looks beyond numbers and addresses the true sources of your symptoms.