Question 1

What's the difference between free testosterone and total testosterone?

Accepted Answer

Total testosterone measures all the testosterone in your blood, including hormone that's bound to proteins. Free testosterone measures only the unbound hormone that's immediately available for your body to use. Free testosterone is typically less than 2% of total testosterone but represents the biologically active portion that can actually affect your cells and tissues.

Question 2

Why is it important to test in the morning?

Accepted Answer

Testosterone levels naturally fluctuate throughout the day, with peak levels occurring in the morning hours. Testing between 7:00-10:00 AM provides the most accurate baseline measurement and allows for proper comparison to established reference ranges, which are based on morning blood draws.

Question 3

Can medications or supplements affect testosterone test results?

Accepted Answer

Yes, several medications and supplements can influence testosterone levels or test accuracy. Biotin supplements should be stopped at least 72 hours before testing. Hormone replacement therapy, certain antidepressants, steroids, and other medications may affect results. It's important to inform the testing facility about any medications or supplements you're taking.

Question 4

How often should testosterone levels be tested?

Accepted Answer

For individuals with symptoms of low or high testosterone, initial testing may be followed by repeat testing to confirm results. Those on testosterone replacement therapy typically need regular monitoring every 3-6 months. For general health assessment, annual testing may be sufficient, though this varies based on individual health factors and symptoms.

Question 5

Can stress or lifestyle factors affect testosterone levels?

Accepted Answer

Yes, various lifestyle factors can influence testosterone levels. Chronic stress, poor sleep, excessive alcohol consumption, obesity, and lack of exercise can all contribute to lower testosterone levels. Conversely, regular exercise, adequate sleep, stress management, and maintaining a healthy weight may help support optimal testosterone levels.

Question 6

Are the results different for men and women?

Accepted Answer

Yes, reference ranges are significantly different between men and women. Men typically have testosterone levels that are 10-15 times higher than women. The test measures the same hormones but uses gender-specific reference ranges to determine whether levels are normal, high, or low for each individual.