Low Testosterone in Men: Symptoms, Testing and Treatment
Low testosterone (hypogonadism, or Low T) is defined by the American Urological Association as a total testosterone level below 300 ng/dL on two separate morning blood draws, combined with documented symptoms. Both pieces — the lab number AND the symptom picture — are required to make the diagnosis.
Key takeaways
- Testosterone levels naturally decline about 1-2% per year after age 30.
- Testosterone naturally peaks between roughly 7 and 10 AM, so blood is drawn in the morning.
- Standard testosterone therapy suppresses sperm production — men who may want children should discuss HCG co-therapy first.
- A baseline PSA and ongoing prostate monitoring belong at the center of every TRT program.
What is low testosterone?
Testosterone regulates sex drive, erectile function, muscle mass, bone density, red blood cell production, mood, and energy. Levels naturally decline with age — typically about 1-2% per year after age 30 — but for some men the decline goes far enough that it produces real, life-altering symptoms.
Two men with the same testosterone number can have completely different underlying problems. A pituitary tumor, untreated sleep apnea, or a thyroid issue can all show up as low testosterone. Treating only the number — without finding the cause — can mask a more serious condition. This is the core reason Low T evaluation belongs with a urologist.
What causes Low T?
- Age-related decline — by far the most common cause; often called andropause or 'male menopause.'
- Primary hypogonadism — the testicles themselves are no longer producing enough testosterone.
- Secondary hypogonadism — the brain (pituitary or hypothalamus) is not sending the right signals to the testicles; more common in younger men and worth identifying.
- Contributing factors — obesity, sleep apnea, chronic illness, diabetes, certain medications, chronic opioid use, and sustained stress can all suppress testosterone.
What are the symptoms of low testosterone?
Low testosterone rarely shows up as one dramatic symptom. If three or more of these have been part of your life for several months, a testosterone evaluation is worth scheduling.
- Persistent fatigue or low energy that doesn't improve with rest
- Reduced sex drive or loss of interest in sex
- Erectile dysfunction or difficulty maintaining erections
- Loss of muscle mass or noticeably weaker workouts
- Increased body fat, especially around the abdomen
- Irritability, low mood, or depression that feels uncharacteristic
- Difficulty concentrating or 'brain fog'
- Poor sleep quality or reduced morning erections
How is Low T diagnosed?
A trustworthy Low T diagnosis is built on three things: a complete symptom history, a comprehensive blood panel, and a physical exam. Testosterone naturally peaks between roughly 7 and 10 AM. Lief Urology follows the AUA standard: morning draw, and a confirmatory second draw if the first result is borderline.
- Total Testosterone and Free Testosterone
- SHBG (Sex Hormone-Binding Globulin)
- LH and FSH — distinguish primary (testicular) from secondary (brain-origin) hypogonadism
- Estradiol (E2)
- PSA (Prostate-Specific Antigen) — required before starting testosterone therapy
- Hematocrit & Hemoglobin (CBC) and a Comprehensive Metabolic Panel
What are the treatment options?
None is universally 'best' — the right choice depends on your lifestyle, preferences, insurance coverage, and how your body responds.
- Injections — most common and most affordable option; predictable absorption; can be self-administered at home after training.
- Topical gels & creams — convenient and needle-free; risk of skin transfer to partners or children must be managed.
- Pellets — long-acting and low-maintenance; dosing cannot be adjusted once placed.
- HCG co-therapy — preserves testicular function and sperm production for men who may want children in the future.
- Peptide therapy — for men whose goals extend beyond testosterone alone.
Is testosterone therapy safe for the prostate?
Testosterone therapy stimulates prostate tissue. Current evidence does NOT show that TRT causes prostate cancer — but testosterone can accelerate the growth of existing prostate cancer. That is why a baseline PSA and ongoing prostate monitoring belong at the center of every TRT program.
TRT can also elevate hematocrit (red blood cell concentration), which thickens the blood and may raise clotting risk if unmanaged. Routine CBC monitoring catches this early.
Monitoring schedule at Lief Urology
- Baseline: complete blood panel, PSA, exam
- 3 months: repeat testosterone levels, hematocrit, estradiol, PSA — to confirm therapeutic range
- 6 months: repeat panel and dose optimization as needed
- Annually thereafter: stable patients are monitored at least once per year
Frequently asked questions
How do I actually know if I have low testosterone?
Diagnosis requires a morning blood draw measuring total and free testosterone, plus LH, FSH, hematocrit, PSA, and estradiol — and documented symptoms. A simplified panel that skips several of these markers is not enough to make a real diagnosis.
Am I too young for testosterone therapy?
TRT is not limited by age. It is indicated by clinical testosterone deficiency with symptoms. Men in their 30s can develop hypogonadism from pituitary dysfunction, injury, chronic illness, or idiopathic causes. Dr. Lief evaluates the underlying cause in younger patients.
Does insurance cover TRT?
Yes — most major insurance plans, Medicare, and Medicaid cover testosterone replacement therapy when medically necessary (testosterone below 300 ng/dL with documented symptoms). TRT-clinic memberships are typically not insurance-billable.
Will TRT affect my fertility?
Yes. Standard testosterone therapy suppresses sperm production. Men who want to maintain fertility should discuss HCG co-therapy with Dr. Lief before starting TRT. HCG preserves testicular function alongside replacement therapy.
Does TRT cause prostate cancer?
Current evidence does not support a causal link between TRT and the development of prostate cancer. Testosterone can, however, stimulate the growth of existing prostate cancer — which is why PSA monitoring at a urologist's office is non-negotiable.
How long until I notice results?
Energy and mood typically improve within 4-6 weeks. Libido and sexual function generally improve by weeks 6-10. Body composition changes (less fat, more muscle) become visible between months 3-6. Full TRT benefits are typically realized at 6 months.
Download the full patient guide
This article is drawn from Dr. Lief's patient education guide, Low Testosterone Information (PDF).
Schedule a consultation
For an appointment and consultation please call 954.755.3801.
Lief Urology
9750 N.W 33rd Street Suite 218, Coral Springs, Florida 33065