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Diagnosing Low Testosterone

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If you're an adult man and you're wondering if you have a low testosterone (low T) level, there are some symptoms to look for.

If your testosterone levels drop below normal, your sex drive may lessen. You may also be less able to get and maintain an erection.

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But low T can also cause many symptoms unrelated to sex. Low testosterone levels can:

  • Lower your energy levels
  • Cut your drive to get things done
  • Make you more irritable

You may also find it tougher to concentrate. And your risk of depression may rise.

Low testosterone can lead to changes in your body, too. For example, you may:

  • Grow less body hair
  • Have a decline in muscle mass
  • See an increase in your breast size

Low T can also cause osteoporosis, which gradually weakens your bones, leaving them brittle and at risk for breaks.

"Men should be aware of these symptoms and think about low testosterone," says endocrinologist Spyros Mezitis, MD, PhD, of Lenox Hill Hospital in New York City. "Physicians have to think about it as well. It remains under-diagnosed and it's not part of a routine checkup."

But these symptoms can also be related to other conditions. Make an appointment with your doctor, who can do some tests to see what's causing your symptoms.

At the Doctor's Office

When you go to the doctor with symptoms of low T, your doctor will:

  • Go over your medical history
  • Discuss medications you take (prescription and non-prescription)
  • Ask you about any family or relationship problems

"We want to look for other possible sources of the symptoms," says Jason Hedges, MD, PhD. Hedges is a urologist at Oregon Health and Science University in Portland. "Other things can lead to these symptoms, including your job, stress, and everyday life."

You will also have a physical exam. Your doctor will examine your body hair, testicles, penis, scrotum, and breasts.

Finally, your doctor will take a blood sample to measure your testosterone level. Your doctor may want to do the blood test first thing in the morning, when most men's testosterone levels are at their highest.

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