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Normal Testosterone levels by age

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I've been curious about normal testosterone ranges lately. My testosterone came back right around 400ng/dL after my latest physical. That was a surprise after years of results in the mid-500s.

 

I expected 400ng/dL to be on the low end for a relatively fit person in their mid-30s, but surprisingly it appears to be quite average.

 

First up: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5698798/

 

This study has a nice graph of testosterone percentiles by decade. Nice chart, but I question their methods as they don't control for obesity or other confounding factors. Strangely, they make a reference to testosterone peaking around 55-60 possibly due to higher exogenous testosterone use among that age group. The first thing I would have expected from a testosterone study was to remove the TRT patients.

 

Next: https://academic.oup.com/jcem/article/102/4/1161/2884621

 

This more recent study appears to be better at stratifying the participants and collecting data from multiple sources. They also separated out the obese patients, which is helpful for controlling perhaps one of the most common factors impacting testosterone levels. Their lowest age group spans from 19 to 39 years old, which are two ages I normally associate with very different testosterone levels. Regardless, their data puts my 400ng/dL result below the 25th percentile for the 19-39 age group, which isn't encouraging.

 

Are there any other studies I should be looking at? I'm going to get a second blood in a few weeks test to confirm my below-average results before I begin to worry about anything.

Screen Shot 2019-01-29 at 6.01.07 PM.png

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13 hours ago, STENDEC said:

You also need to be looking at your free T levels....total T of 400 is lowish but if your free T is normal-high, it's nothing to worry about.

 

Are you symptomatic? 

Good point. I'm transferring to a specialist next. If the new doctor doesn't order Free T, I'll fill in the gaps with some extra labs.

 

I'm symptomatic of something, but I don't think hypogonadism is the cause. Maybe a tertiary effect of something else. I've been unreasonably fatigued for the past two months. Diminished energy levels, reduced appetite, feeling chilled. My last gym trip was nothing more than stretching followed by 5x5 squats @ 135 lbs, and that left me wiped out for four days.

 

CBC, thyroid panel (TSH, FT4), and urinalysis showed nothing out of the ordinary. Everything was consistent with previous bloodwork except for serum testosterone (580 -> 400), LDL (89 -> 103), and HDL (46 -> 39). My testosterone has been 570 +/- 10 for the past three years of blood tests, then suddenly I'm at 400.

 

Something's up. I just don't think testosterone is at the core of it. I have zero lifetime exposure to AAS or performance-enhancing drugs, BTW.

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Stress will do all of those things, including the hormonal changes. Maybe check your cortisol levels? (god, that counded like something that would have been said on Mindandmuscle back

in the day)...

 

I've had pretty good luck just asking for the additional tests before the doc writes up the orders. "hey could you order free test along with total test?" or "could you be sure to order a sensitive estradiol test just to be sure that's not causing the drop in Tt?"

 

The docs have largely just gone and done what I ask. Part of that may be my PPO coverage, but...

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All jokes aside, there are a lot of potential factors/causes. 

 

Not getting much sun (I don't recall where you live). Decrease in sleep hygiene, too much blue light at night. Stress. Watching CNN. Change in diet. New supplements or medications. Fighting a bug etc.

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2 hours ago, dr. frankenstein said:

"The Panel recommends that clinicians use the minimal dosing necessary to drive testosterone levels to the normal physiologic range of 450-600 ng/dL"

 

 

This is almost a universal target for TRT treatment based on no actual science that I am aware of...why wouldn't we shoot for the levels of men at their most virile?

 

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.

 

 

On 2/9/2019 at 4:50 PM, STENDEC said:

This is almost a universal target for TRT treatment based on no actual science that I am aware of...why wouldn't we shoot for the levels of men at their most virile?

 

.

 

i am on 1.100 ng/dl at 55 years old (no TRT)

muscle mass normal, libido  sub-standard.

 

more testorene does not mean necessarilly a better perfomance.

 

"some conditions apply"

 

..........:ph34r:

 

.

 

.

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