A total testosterone level of 350 ng/dL is not technically classified as low by major medical guidelines, but it sits close enough to the cutoff that symptoms and context matter. The American Urological Association sets the diagnostic threshold at 300 ng/dL, meaning 350 falls just above the line. Whether that number is a problem for you depends on your symptoms, your age, when the blood was drawn, and what your free testosterone looks like.
Where 350 Falls in the Reference Range
The harmonized reference range for testosterone in healthy, non-obese men ages 19 to 39 is 264 to 916 ng/dL. That range represents the 2.5th to 97.5th percentile, meaning 350 puts you in the lower portion of normal but still within bounds. For a man in his 20s or 30s, 350 is on the low side of where most peers land. For a man in his 60s or 70s, it’s more squarely in the middle of expected values.
Age-specific data helps put the number in perspective. Men ages 40 to 49 typically range from 252 to 916 ng/dL. By ages 60 to 69, the range shifts to 196 to 859 ng/dL, and by 70 to 79, it drops to 156 to 819 ng/dL. A 35-year-old at 350 is closer to the floor of his expected range than a 65-year-old at the same level.
Why the 300 ng/dL Cutoff Isn’t Absolute
The AUA’s 300 ng/dL threshold is a clinical guideline, not a biological switch. Testosterone doesn’t work like a light that’s either on or off. A man at 310 and a man at 290 are functionally similar, even though one technically qualifies as “low” and the other doesn’t. The Endocrine Society takes a more flexible approach, recommending diagnosis only when consistently low levels appear alongside clear symptoms. In other words, the number alone doesn’t tell the whole story.
If you’re at 350 but experiencing significant fatigue, low sex drive, erectile dysfunction, loss of muscle mass, or mood changes like persistent irritability or difficulty concentrating, those symptoms are clinically relevant. A diagnosis of hypogonadism (the medical term for low testosterone) requires both the lab result and the symptom picture to line up.
Your Test Result Might Not Be Accurate
Testosterone levels fluctuate dramatically throughout the day. They peak in the early morning and can drop by 50% or more by evening. One study tracking a single male subject found a morning-to-evening decline of roughly 63%. This is why guidelines specify that blood should be drawn between 7 and 10 a.m., ideally while fasting. If your 350 reading came from an afternoon draw or after a meal, your true baseline could be meaningfully higher.
A single test also isn’t enough. Both the Endocrine Society and AUA recommend confirming the result with at least one repeat morning fasting blood draw. Testosterone can swing from day to day based on sleep quality, stress, illness, and alcohol use. Two consistent readings give a much clearer picture than one.
Total vs. Free Testosterone
The 350 number on your lab report is your total testosterone, which includes testosterone bound to proteins in your blood and a small fraction that circulates freely. Only the free portion is biologically active, meaning it’s the testosterone your body can actually use. Some men have a normal total level but low free testosterone, which can produce the same symptoms as overtly low total testosterone.
This distinction matters at a borderline reading like 350. If your free testosterone is also in the low range, the clinical picture looks different than if your free levels are healthy. A protein called sex hormone-binding globulin (SHBG) determines how much of your total testosterone stays bound and unavailable. SHBG tends to rise with age, meaning older men with a total of 350 may have less usable testosterone than younger men at the same total level. Checking free testosterone alongside total gives a fuller picture, especially in the gray zone between 300 and 400.
What Causes Borderline Levels
A reading of 350 in a younger man often has identifiable contributors. Excess body fat is one of the most common. Fat tissue converts testosterone into estrogen, and higher body weight is strongly associated with lower testosterone. Sleep deprivation, chronic stress, and heavy alcohol use all suppress production as well. In some cases, addressing these factors can raise levels meaningfully without any medical intervention.
Other causes are harder to reverse. Damage to the testes from injury, infection, or certain medical treatments can reduce production permanently. Problems with the pituitary gland, which signals the testes to make testosterone, can also be responsible. Certain medications, particularly opioids and some corticosteroids, lower testosterone as a side effect. When the cause is medical rather than lifestyle-related, treatment looks different.
Treatment at 350 ng/dL
Most clinicians won’t prescribe testosterone replacement therapy based on a level of 350 alone. The VA, for example, notes that most clinical trials for testosterone therapy use an enrollment cutoff of below 275 ng/dL, and the statistical lower limit for healthy young men is 264 ng/dL. Insurance coverage for treatment typically requires documentation of levels below or near the 300 threshold along with documented symptoms.
If you’re at 350 with bothersome symptoms, the first step is usually retesting under proper conditions: early morning, fasting, on two separate occasions. If repeated tests confirm a level near or below 300 with clear symptoms, testosterone replacement becomes a reasonable conversation. If your levels stay in the 340 to 380 range, lifestyle modifications like losing excess weight, improving sleep, reducing alcohol, and strength training are the standard first-line approach. These changes can raise testosterone by a clinically meaningful amount, particularly when obesity is a factor.
For men whose repeated levels fall in the borderline zone and who have persistent symptoms despite lifestyle changes, some providers will consider a trial of therapy on a case-by-case basis. This is more common at specialized men’s health or endocrinology clinics than at a general practice.
What to Do With Your Result
If your level came back at 350, the most useful next step is confirming it with a second early morning fasting draw. Pay attention to the symptoms list: reduced sex drive, erectile problems, fatigue, mood changes, loss of muscle mass, and difficulty concentrating. If you’re experiencing several of these and your repeat test confirms a similar level, the result is worth discussing with your provider even though it’s technically above the 300 cutoff. If you feel fine and the test was part of routine screening, 350 is within normal range and not a cause for alarm on its own.