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  1. Dr. John Crisler

    TRT without the use of Aromatase Inhibitors

    As an Osteopathic physician, less drugs is better. To be clear, I wish we never had to add an AI to a gentleman's TRT regimen. Through this thread, let's explore this topic. I am especially interested in hearing from guys who previously were on an AI, then successfully discontinued it. At a...
  2. Dr. John Crisler

    MALE BIRTH CONTROL PILLS: This is a REALLY Bad Idea

    MALE BIRTH CONTROL PILLS: This is a REALLY bad idea. http://ktla.com/2018/03/20/male-birth-control-pill-a-step-closer-to-reality-as-study-finds-experimental-contraceptive-is-safe/ Yes, and Thalidomide was “safe and effective” as treatment for nausea during pregnancy, too. If you don’t know...
  3. Dr. John Crisler

    Hello from Dr. John Crisler

    Hi guys! I'll be checking in to see if I can help out a bit. I'd like to add that I have been sending my patients to www.DiscountedLabs.com when they either have to pay out-of-pocket, or if their medical insurance coverage is not very good, saving them a lot of money. Used them hundreds of...
  4. Dr. John Crisler

    FREE LEF Membership, and my book

    The nice folks at the Life Extension just ordered another 50 copies of my book "Testosterone Replacement Therapy: A Recipe for Success". LEF members can purchase the book at a discount. And you can get a FREE annual membership to the LEF (and get their AWESOME monthly magazine!) by clicking on...
  5. Dr. John Crisler

    Quest Diagnostics Ultrasensitive Estradiol Code

    The code, and range, provided in this thread: Suggested Lab Tests and Questions Before and After Initiation of Testosterone Replacement ...needs an edit. The proper code is 30289, and range is "<29" (I am unable to reply to that thread directly)
  6. Dr. John Crisler

    We Know Estrogen is a Sex Hormone, But is it Also a Neurotransmitter?

    My pal Dr. Mark Gordon just sent me this: Is brain estradiol a hormone or a neurotransmitter? - PubMed This may explain why T gels are better for treating sexual dysfunction; they provide much more variability throughout the day. This would be in addition to increasing DHT more than shots...
  7. Dr. John Crisler

    Dr. John is in the House

    "Howdy, Boyz!"
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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