Calculating Estimated Total T

[Howee]

After starting TRT I had the standard blood test on week 9 to check my levels. My blood was tested 4 days after injecting testosterone cypionate. My total T came back 986 ng/dl. Considering that exogenous testosterone cypionate has a half life of roughly 8 days, is there a way to determine what my peak total testosterone might have been when it was at its highest level two days after injecting? Is it possible my number might have been over 1200 ng/dl?

Thanks!

[Andrewgen_Receptors]

Your blood test was timed accurately. Measuring trough TT is more reliable than measuring peak levels, and it’s likely your TT was over 1200, but that number is quite irrelevant to be honest. You can ballpark your peak test levels, but again - irrelevant information.

Some reading for you

Tool to Assess your TT Dose Response -- Percentile Curves

Summary: Tools to estimate your individual dose response for injectable testosterone ester in comparison to a normal distribution (95 percentile confidence estimate) of adult males (Ref). Plot below shows a summary of data from (1) clinical trials gathered from the literature + (2) crowdsourced data gathered here and elsewhere. I’ll add to the dose response chart as time allows. More background info on charts below can be found here and here in particular. Key considerations: If you are t…

[systemlord]

@Howee

Considering that exogenous testosterone cypionate has a half life of roughly 8 days, is there a way to determine what my peak total testosterone might have been when it was at its highest level two days after injecting?

This is problematic, some peak at 8 hours, other 12-24 hours, peak becomes elusive. Two days or 48 hours after your injection wouldn’t be peak.