Free vs Total Testosterone: What Most Men (and Doctors) Get Wrong

madman

Super Moderator

Free testosterone vs total testosterone — which one actually matters? In this video, Dr. Justin Houman, board-certified urologist and men’s health specialist, explains the key difference between total testosterone and free testosterone, how sex hormone binding globulin (SHBG) affects your results, and why your symptoms matter more than your lab numbers.

Learn why you can “look normal” on paper but still have low testosterone symptoms, and what tests you really need to ask for to get an accurate diagnosis.





Timestamps / Chapters:

00:00 – Have You Checked Your Testosterone Levels?
00:20 – Total vs Free Testosterone Explained
01:30 – Why “Normal” Testosterone Can Be Misleading
02:00 – The Role of Sex Hormone Binding Globulin (SHBG)
02:40 – Free Testosterone and Low T Symptoms
03:30 – When to Test: Timing and Frequency
04:10 – Treating the Patient, Not the Number
05:00 – Shared Decision Making in Low T Treatment
05:30 – TRT and Fertility: What Every Man Should Know
06:20 – Final Thoughts: Total vs Free Testosterone
 

hCG Mixing Calculator

HCG Mixing Protocol Calculator

TRT Hormone Predictor Widget

TRT Hormone Predictor

Predict estradiol, DHT, and free testosterone levels based on total testosterone

⚠️ Medical Disclaimer

This tool provides predictions based on statistical models and should NOT replace professional medical advice. Always consult with your healthcare provider before making any changes to your TRT protocol.

ℹ️ Input Parameters

Normal range: 300-1000 ng/dL

Predicted Hormone Levels

Enter your total testosterone value to see predictions

Results will appear here after calculation

Understanding Your Hormones

Estradiol (E2)

A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

DHT

Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.

Free Testosterone

The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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