Low testosterone can affect sex drive, energy level, mood, muscle mass and bone strength.
Grumpiness is even used as a mood description in screening questionnaires for low testosterone.
If tests confirm you have low testosterone, further testing can determine if a testicular disorder or a pituitary abnormality is the cause.
According to the American Association of Clinical Endocrinologists, up to 30 percent of men beyond the age of 75 have low testosterone levels.
Certain metabolic and kidney diseases, including diabetes, are known to cause abnormally low testosterone, Shabsigh says, adding the prevalence of those disorders rises with age.
Unfortunately, this statistic cuts like a knife the other way as well: research also shows that low testosterone in men is linked to weight gain, Type 2 diabetes and cardiovascular disease (along with poor sexual performance).
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Such a physician might be able to guide the parents of colicky babies through a difficult time that is (mercifully) usually transient, and could also help patients requiring hormone replacement therapy (whether for low thyroid hormone levels or low testosterone levels) decide what replacement dose makes sense, and reach a conclusion that would be informed by numeric criteria but not exclusively defined by it.
FORBES: Are doctors over-responsive to patients -- or not attentive enough? (Answer: yes.)
In the case before the court, Solvay Pharmaceuticals is accused of paying off would-be generic manufacturers of their blockbuster drug AndroGel, a synthetic testosterone used by hundreds of thousands of AIDS patients, cancer patients, elderly men and others who suffer from low levels of testosterone.
The ability to tolerate or deal with it is reduced when the testosterone is low.
Gatlin, the 2005 world 100m and 200m champion, gave a positive test for testosterone at the low-level Kansas Relays in April 2006.
BBC: Gatlin won the 100m title at the Athens Olympics in 2004
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