Fasting Blood work verses Non Fasting Blood work

[Smokin Joe]

I had my first visit with my Urologist today after nine months of no Testosterone.
I had made this appointment to approach him about restarting T after my Endo dropped me.
Anyway to my surprise he said sure "Lets do blood work". It was 8:30 am and I had eaten breakfast and had coffee.
This afternoon he called with my results and my total T was 316. Worst ever. In June 2015 it was 475 which is still a tweak low for me as I normally run 500/525.
My question is does it make that much of a difference to fast or not when measuring testosterone.
This concerns me that there was that much of a difference in my test in just two months.
PSA holding at 2.0. I have opted to go for biopsy prior to restarting just to be safe, providing the doc agrees.

 

[Nelson Vergel]

You may want to read this.

Testosterone Blood Tests Should Be Done in a Fasted State

 

[Smokin Joe]

104-. Thanks Nelson.
This makes total sense. I'll recheck it myself next week in a fasting condition.
The doc feels that I will not benefit any from TRT but I beg to differ having expericnced the goodness already.

 

[Vince]

You really learn a lot on this site, I never thought eating or having food in your stomach would affect testosterone levels.

 

[Smokin Joe]

Vince this site is a Great resouce as most Physicians still do not know the ins and outs of TRT
!!

 

[ERO]

You may want to read this.

Testosterone Blood Tests Should Be Done in a Fasted State

I read this, but I get the feeling that Dr Scally is referring to naturally produced Testosterone, not a person on TRT. It does not say so in so many words, but its referring to circadian rhythms, how food influences T production, etc...Can anybody confirm?

 

[HarryCat]

I read this, but I get the feeling that Dr Scally is referring to naturally produced Testosterone, not a person on TRT. It does not say so in so many words, but its referring to circadian rhythms, how food influences T production, etc...Can anybody confirm?

Since they were also monitoring LH I would assume that these were guys not on TRT.

 

[Vince]

I read this, but I get the feeling that Dr Scally is referring to naturally produced Testosterone, not a person on TRT. It does not say so in so many words, but its referring to circadian rhythms, how food influences T production, etc...Can anybody confirm?

yes that's also my understanding, the natural production of testosterone

 

[Nelson Vergel]

HarryCat

You are right. Fasting is not needed if you are on TRT.

 

[ERO]

Excellent, thank you everyone!

 

[torrential]

Not to belabor the point (a phrase which usually means that I'm about to belabor the point), but there are other markers you may be measuring addition to your androgens that can be affected by fasting state. Also, some of us are producing T and other hormones endogenously, perhaps in response to HCG, and those levels will be affected by fasting as well as by the daily metabolic cycle.

To avoid any questions regarding fasted/fed & time of day, I've been getting blood drawn early in the morning, fasted. All of my draws over the last two years are within the same 30 minutes period of 7:45-8:15am.