Low Testosterone: The Long Term Health Consequences
So if the doc tells you a reading of 350 is fine, you can always do the reverse of what I tell you on this site: for a few days prior to your blood test try to decrease your testosterone: eat a high fiber, low fat diet with little saturated fat all the while you're overtraining on little sleep. That ought to whack a good 30% off your score. But a better solution is to just get a new doctor. You want to work with someone who is not living in 80's as far as medical knowledge and practice.
Why do I say that? Because the symptoms of low testosterone are just plain dangerous. Low testosterone is associated with heart disease, depression , Metabolic Syndrome , diabetes , cognitive disorders and even osteoporosis. It is no exaggeration to say that low testosterone is the Kiss of Death for all you male homo sapiens out there. A 2007 study found that low testosterone was associated with increased risk of death from heart disease, cancer and all causes.  So please, please do NOT accept your doctor's opinion that testosterone in the 200's or 300's is okay.
One of the reasons that low testosterone is so deadly is that it somehow effects all the major cardiovascular markers. One recent large scale epidemiological study found that low testosterone men, < 250, were 1) fatter, 2) had lower HDL, 3) higher triglycerides, 4) higher blood pressure and 5) higher blood glucose.  That is a deadly combination! The low testosterone men were tracked over 18 years and it was found that they had a 40% higher death rate from all causes!
Low testosterone will also often put your relationships and career at jeopardy as well, because testosterone so strongly effects the male brain. For example, supplemental testosterone can aid certain types of memory in men. Working memory, which allows you to manipulate information over brief periods of time in order to make a response, improves. Verbal memory, which helps you recall lists of words, and spatial memory, which helps you navigate a route, also benefit.  (By the way, I cover many ways that science has found to re-build your brain on this site. See this link on the Brain for more information about how to build your cognition and memory no matter what your age.)
I should also mention that low testosterone is associated with increased risk of Alzheimer's Disease (AD) as well! How's that for an ugly symptom? The well-known Baltimore Longitudinal Study showed this strong correlation do dementia. Researchers are still trying to figure out why, but studies of rat brain cells found that the hormone limits the production of beta-amyloid peptides. These sticky protein fragments, thought to be a prime contributor to Alzheimer's, build up into small, round deposits and clog the brains of people with the disease.
The hormone also may help ward off AD by directly preventing brain cell death. In studies, researchers manipulated human brain cells, sending them on a course to die. Adding doses of testosterone, however, limited the [brain] cell death."
No wonder that low testosterone leads to depression, feeling like you're "in a fog" and difficulties concentrating! Your libido will probably sag and you may find that you really don't care about much of anything. Low testosterone can even easily lead to anxiety and depression as well. Remember: these are not just symptoms - low testosterone effects your brain chemistry at its core.
On top of all that low testosterone men tend to be slightly sleep deprived because research has shown that low testosterone leads to poor quality sleep.  This is probably due to the extra adiposity (body fat) that comes from decreased muscle mass. You need your testosterone to burn that fat off your midsection!
I should also mention, though, that one recent study found that many males with low testosterone, defined as < 300, were asymptomatic. In fact, that study found that almost 50% of males in the 50+ age range had no significant symptoms with low testosterone.  In other words, there is a significant percentage of you and your friends out there, generally in the 40+ age range, that are walking around with low testosterone and are actually not even exhibiting symptoms. That is why I would advise any middle-aged and beyond guy to occasionally get his testosterone checked even if he's "feeling pretty good".
The bottom line is that you need your testosterone. It's the heart and soul of the male physiology and psychology. But I thought it was dangerous to boost your testosterone you may ask? (Please read my link on the Prostate to find how to greatly improve your odds against Prostate Cancer.) Remember: I'm not a doctor, so you should talk to yours. But I want to point out that decades of studies have shown time and again that there is no link between prostate cancer and testosterone supplementation.
Testosterone is a natural substance INCREDIBLY important to your male body and mind. If your levels are low, testosterone supplementation is not abuse: it's simply getting your hormone levels back in line. Remember: your goal is not to be Barry Bonds with sky high testosterone levels so you can compete with other ten million dollar elite athletes. You are simply trying to get your tissue levels back reasonably close to the days of your youth. All these nasty symptoms can go away in a day if you get rid of your low testosterone.
Again, what is really dangerous is to NOT boost your testosterone. Low testosterone symptoms are not just symptoms: low testosterone levels will literally kill you (and before that probably make you miserable and impotent). So, please, get to the doctor and get tested if you have any doubt. (And don't be afraid to get tested again: testosterone readings can sometimes be off.)