What is actually the best T level? When is it too high?

Testosterone labs are normally taken by 8:30am on your trough day. 11:30 - 1:00pm is not the right time to test for testosterone levels period. Nor is it your trough time. After 8:30am serum testosterone levels normally drop. This is why most labs suggest that testosterone labs be done before 8:30am. Everyone here gets their bloods taken by 8:30 am on their trough day. And this coincides with your shot being taken just after labs. If your not taking your shot just after your morning labs then you are doing it wrong and the lab result will be incorrect and therefore you won't be able to adjust dosage because of the incorrect data.
 
Just jumping back to the initial question; "What is actually the best T level? When is it too high?"
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My last Lab results showed Testosterone = 29.2nmol/L ( 8.0 - 27.4) which is just above the upper limit of 27.4
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Here is the conversion tool for anyone who needs it
https://www.nebido.com/en/hcp/research/testosterone-tools/conversion-tool.php
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My result of 29.2 nmol/L = 841ng/dl, again this is in the higher limit of what the "UK" consider safe limits but it works for me and my "UK" Oestradiol (estradiol with an "O") is satisfactory

I read on the thread that there are no limits for testosterone levels and its what feels good for you, this is not the case in UK as there are vast concerns that high Testosterone causes rises in your PSA and that is the main fear for doctors (GP's) in UK.
with the reading above my PSA stayed current at 1.2ug/L
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You guys obviously have more indepth knowledge than myself as I am only going by advice from my doctor & Consultant Urologist but the do look closely at my PSA, Oestradiol, HGB & HCT as well as T readings
 
Testosterone labs are normally taken by 8:30am on your trough day. 11:30 - 1:00pm is not the right time to test for testosterone levels period. Nor is it your trough time. After 8:30am serum testosterone levels normally drop. This is why most labs suggest that testosterone labs be done before 8:30am. Everyone here gets their bloods taken by 8:30 am on their trough day. And this coincides with your shot being taken just after labs. If your not taking your shot just after your morning labs then you are doing it wrong and the lab result will be incorrect and therefore you won't be able to adjust dosage because of the incorrect data.


Pretty sure this is a non issue with those on TRT. We are providing exogenous testosterone and suppressing the "natural" Production of T.
 

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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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