My Testosterone Is 350: Is That Low?

The 350 Question

You got your blood work back. Your total testosterone is 350 ng/dL. Your doctor says it is normal. The reference range on the lab report shows 264-916 ng/dL, and you are within it. Case closed, right?

Not necessarily. A testosterone level of 350 puts you in the bottom quarter of the reference range. That range was established by measuring testosterone in a broad population of men ages 19-86. Being at the 25th percentile of a range that includes 80-year-olds does not mean your levels are where they should be for your age and health.

Normal vs Optimal

There is a critical difference between normal and optimal. The reference range tells you where 95% of men fall. It does not tell you where you feel best. Many men experience significant symptoms at levels between 300-450 ng/dL that resolve when levels are brought to the 500-700 range. The gap between technically normal and functionally optimal is where most men get stuck: symptomatic enough to know something is wrong, but not low enough for their doctor to act.

What Symptoms Look Like at 350

Men with testosterone at 350 commonly report moderate but persistent fatigue that does not resolve with sleep, decreased libido that they may have normalized over time, difficulty maintaining muscle mass despite regular training, gradual increase in belly fat, mild to moderate brain fog, and decreased motivation. These symptoms are real and measurable even though they fall below the threshold that most physicians use for diagnosis.

Context Matters

A total testosterone of 350 means different things depending on your free testosterone and SHBG levels. If your SHBG is high, binding more of your testosterone, your free testosterone may be quite low even though total looks adequate. Free testosterone is what your body actually uses. A total of 350 with high SHBG might mean a free testosterone that is functionally deficient.

Your age also matters. A 350 in a 70-year-old is unremarkable. A 350 in a 35-year-old is concerning and warrants investigation into why levels are that low at a young age.

What to Do With This Number

If your testosterone is 350 and you are experiencing symptoms, the next steps are to get a comprehensive panel that includes free testosterone, SHBG, estradiol, LH, and FSH. This additional context determines whether your 350 is truly benign or whether it explains how you have been feeling. If free testosterone is low, if symptoms are consistent, and if a second confirmatory test shows similar levels, treatment should be discussed regardless of where the number falls on the reference range.