Low Testosterone Symptoms in Men

• Most specific symptoms: poor morning erections, low sexual desire and erectile dysfunction. In the European Male Ageing Study these three were the only symptoms with a syndrome-like link to low testosterone; fatigue, low vigor and depression were linked more loosely.
• The number: the AUA uses a total testosterone below 300 ng/dL as a reasonable cutoff. The European study defined late-onset hypogonadism as at least three sexual symptoms plus total testosterone under 11 nmol/L (about 320 ng/dL) and low free testosterone.
• The test rule: two total testosterone measurements on separate days, both early in the morning. Testosterone peaks around 3 to 8 a.m. in men with usual sleep hours, so a single afternoon result can mislead.
• Test even without symptoms if you have unexplained anemia, bone loss, diabetes, chronic opioid or steroid use, HIV, infertility, pituitary problems or past chemotherapy or testicular radiation (AUA).
• Cost: Mito Health listed a total testosterone test at Quest for $4.32 (members, $9/mo) or $6.05 (non-members) on Oct 11, 2026, plus any itemized lab fee.

Partner links may earn us a commission. Learn more

Sorted by the lowest published monthly cost. "Starting at" prices can change after a clinician sets your dose. Linked brands are affiliate or applied-for programs (rel="sponsored"); other sellers are listed as plain text for price context only.

The European Male Ageing Study surveyed a random sample of 3,369 men aged 40 to 79 in eight countries and measured morning testosterone by mass spectrometry. Six symptoms were significantly related to testosterone levels: poor morning erections, low sexual desire, erectile dysfunction, inability to do vigorous activity, depression and fatigue. Only the three sexual symptoms had a syndrome-like association, and the more of them a man had, the lower his testosterone tended to be.

The likelihood of the sexual symptoms and limited physical vigor rose as total testosterone fell through roughly 8 to 13 nmol/L (230 to 370 ng/dL). The study’s definition of late-onset hypogonadism required at least three sexual symptoms plus total testosterone below 11 nmol/L and free testosterone below 220 pmol/L.

• Strongest link: fewer or weaker morning erections, low sexual desire, erectile dysfunction.
• Weaker link: trouble with vigorous activity (running, lifting heavy objects), low mood, fatigue.
• Signs a clinician looks for: anemia, bone loss, loss of body hair or muscle, breast tissue growth.

The AUA cutoff of 300 ng/dL applies at any adult age, and the guideline lists conditions that justify testing even without symptoms, including infertility, chronic opioid or corticosteroid use and pituitary problems. In younger men, a low result calls for a search for the cause: the AUA recommends measuring luteinizing hormone (LH) in every man with low testosterone, and prolactin when LH is low or low-normal.

Testosterone therapy suppresses sperm production. The AUA says men interested in future fertility should have a reproductive health evaluation before treatment, and the Endocrine Society recommends against starting testosterone in men planning fertility in the near term. Our [enclomiphene vs TRT guide](/blog/enclomiphene-vs-trt) covers the fertility-sparing option some clinics prescribe.

The AUA chose 300 ng/dL as a reasonable cutoff based on mean levels in the best available studies. The Endocrine Society recommends measuring fasting morning total testosterone with an accurate assay, repeating it to confirm, and using free testosterone (by equilibrium dialysis or an accurate formula) when the total is near the lower limit or SHBG is likely abnormal.

If one test is under 300 ng/dL and the repeat is normal, the AUA leaves a third test to the clinician’s judgment; it does not insist on fasting, since the evidence that food lowers testosterone is weak. Use the same lab and the same assay for both tests so the numbers are comparable.

Symptom questionnaires are everywhere, but the AUA does not recommend validated questionnaires to define who should get testosterone therapy or to track response. Low energy, low mood and weight gain overlap with depression, poor sleep, sleep apnea, alcohol and many medicines. Use symptoms to decide whether to test, and the blood tests to decide what they mean.

For men with confirmed low testosterone, the AUA tells clinicians to explain that therapy may improve erectile function, low sex drive, anemia, bone density, lean body mass and depressive symptoms, and that evidence is inconclusive for cognition, diabetes measures, energy, fatigue, lipids and quality of life.

Before starting, the AUA recommends measuring hemoglobin and hematocrit and, in men over 40, a PSA. Our [TRT risks and labs guide](/blog/trt-risks-labs-fda-label-2026) covers the TRAVERSE heart-safety trial and monitoring, and [TRT cost online](/telehealth/trt-cost) compares clinic prices, including the cheapest legitimate routes.

Prices and product facts come from each seller’s own pages, read Oct 11, 2026. We link only to sellers we have an affiliate relationship with and to government and research sources; other sellers' prices are quoted as plain text.

• Mito Health: Testosterone, Total blood test (Quest Diagnostics) (opens in new tab)
• Mito Health: Testosterone, Free and Total blood test (Quest Diagnostics) (opens in new tab)
• AUA guideline: Evaluation and management of testosterone deficiency (statements 1–17) (opens in new tab)
• Mulhall et al., J Urol 2018: AUA testosterone deficiency guideline (PMID 29601923) (opens in new tab)
• Bhasin et al., J Clin Endocrinol Metab 2018: Endocrine Society guideline on testosterone therapy (PMID 29562364) (opens in new tab)
• Wu et al., N Engl J Med 2010: identification of late-onset hypogonadism, European Male Ageing Study (PMID 20554979) (opens in new tab)
• DEA: Drug scheduling (testosterone is Schedule III) (opens in new tab)