I had a blood test in Ireland in 2012 and my testosterone was '30.1'. I have had a test recently (2014) and it is 15.3 nmol/l (Range 6.3-24.7).
I don't know what metric the test used in 2012 but if it is nmol/l my Testosterone levels have dropped by almost half???
What could the measurement be?
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To raise it, you'll need to increase its natural substrate: cholesterol. Eat more saturated fats: egg yolks, butter, bacon, avocado, coconut oil. Be sure to get plenty of zinc and magnesium as well.
Keep your stress levels low, or cortisol will pull the classic "Pregnenolone steal" and prevent testosterone from being created.
To stimulate the creation of testosterone, you could supplement with tribulus terrestris and longjack (aka Tongkat Ali). But don't overdo it. You could also supplement with DHEA, though this is tricky and should be avoided.
If you've got a spare tire, sadly, fat contains an enzyme called aromatase which converts testosterone into estrodiol. To block the action of this enzyme you'd supplement with DIM and calcium-D-glucarate. Careful with DIM, it can turn off ATP production. There are other estrogen blockers out there, for example, resveratrol is one.
I had super low testosterone for a while. Like, rare erections. My levels got back to normal range, however. Firstly, I started eating more carbs, especially at night. I also did resistance training at least three times weekly and made sure not to overdo it because the cortisol surge from excessive exercise antagonises T. More muscle mass also contributes to higher T. Another problem could be conversion to estrogen through aromatase, which you can inhibit with supplements like DIM. Maca also seems to help my mood, energy, and sex drive, but I doubt it affects T. Egg yolks also seem to really help because the body probably needs cholesterol. Also make sure you get adequate trace minerals like zinc. And yes, sticking to your circadian rhythm with consistent sleep is absolutely necessary, as well as avoiding unnatural light in the evening. I'm not a scientist but my personal experience convinced me that PUFA should be limited, even omega 3. Fish is very nutritious but fish oil was not helpful.
"Is there any other blood metric that the 30.1 could have been?" "What could the measurement be?"
2 possible options (i think);
The 30.1 is nmol/L. & was a fairly high testosterone reading. ranges can vary a bit between labs. wiki lists two different example ranges, one with an upper limit of 35 nmol/L.
The 30.1 is pmol/L. & it was actually a Free testosterone reading. Now without the lab range this does not mean much. I have a Free T lab report with a lab range of 25.0 - 120.0 pmol/L. but from what i can tell this range for Free T may be for an 'old' lab test method*. a google now tends to show Free T lab ranges with upper limits of 740 or 750 pmol/L.
*Edit: or it could be the Free T 25-120 pmol/L range is used in some (or all?) Australian labs (so could be used by Irish labs as well).
Testosterone levels even in healthy men vary a ton based on environmental factors like diet, sleep, stress, etc. If you have good energy, eat a good diet and aren't depressed I wouldn't worry about it at all (especially if you're young).
Well, according to that range you had high levels of testosterone before which now dropped down to normal levels, so why would you be worried? Normal levels are a good thing. Testosterone isn't one of those things where higher is better, since it puts you at risk for a whole bunch of diseases. I know people like to feel manly and have beefy muscles, but getting prostate cancer isn't very fun, you know...