Getting testosterone replacement therapy starts with blood work confirming your total testosterone is below 300 ng/dL on at least two separate morning tests. From there, a doctor evaluates your symptoms, rules out other causes, and determines whether TRT is appropriate and safe for you. The process typically involves a few appointments spread over several weeks before you receive your first prescription.
Symptoms That Qualify You
Low testosterone numbers alone aren’t enough for a diagnosis. You also need to have symptoms. The ones doctors look for include low sex drive, erectile difficulty, fatigue, loss of muscle mass, increased body fat (especially around the midsection), depressed mood, and difficulty concentrating. Sleep disturbances and reduced motivation are common too.
These symptoms overlap with dozens of other conditions, from thyroid disorders to depression to simple sleep deprivation. That overlap is exactly why the diagnostic process requires lab confirmation rather than relying on symptoms alone.
The Blood Tests You’ll Need
The cornerstone is two total testosterone blood draws taken in the morning, ideally between 8 and 10 a.m., at least one week apart. Testosterone peaks in the early morning and drops throughout the day, so timing matters. Both results need to come back below 300 ng/dL, which is the cutoff the American Urological Association uses for diagnosis. Some insurance plans and VA coverage criteria also require that you fast before the draw.
Beyond testosterone levels, your doctor will order additional labs before writing a prescription. These typically include a complete blood count (to check your red blood cell concentration), liver function tests, a PSA test to screen for prostate issues, a prolactin level, and a luteinizing hormone test. The luteinizing hormone result helps distinguish whether the problem originates in your brain’s signaling to the testes or in the testes themselves, which can change the treatment approach.
Which Doctors Prescribe TRT
Several types of providers can diagnose and prescribe TRT. Urologists are the most common specialists for this, and endocrinologists handle it as well. Many primary care doctors are comfortable managing straightforward cases. If your situation is more complex, involving fertility concerns, a history of prostate issues, or borderline lab values, a specialist referral makes sense.
Online TRT clinics have become widely available. The American Urological Association guidelines don’t technically require a physical exam for diagnosis, which makes telehealth-based care possible within clinical guidelines. However, all testosterone formulations are Schedule III controlled substances, and prescribing rules for controlled substances vary by state. Some states require an in-person visit before a provider can prescribe them. Even when it’s not legally required, many experts recommend an initial in-person visit, either with the prescribing doctor or with your local primary care provider, so someone has physically examined you before treatment starts.
Who Can’t Take TRT
TRT is not an option if you have untreated prostate cancer or breast cancer. Men considered high risk for prostate cancer, including those with a first-degree relative who had it or African American men with an elevated PSA above 3, face additional scrutiny and may be turned down. If your red blood cell concentration (hematocrit) is already elevated above 54%, therapy has to wait until that number comes down, since testosterone thickens the blood further. Sleep apnea is considered a relative contraindication, meaning it doesn’t automatically disqualify you but requires careful evaluation.
Men who are actively trying to conceive should know that TRT suppresses sperm production, often severely. If fertility is a priority, your doctor will likely suggest alternative treatments that stimulate your body’s own testosterone production without shutting down sperm.
Delivery Methods Compared
Once you’re approved, you and your doctor choose a delivery method. Each has tradeoffs in convenience, cost, and consistency of testosterone levels.
- Injections are the most common and least expensive option. You inject into the muscle every two to four weeks, though many men split doses into weekly or twice-weekly shots for more stable levels. These can be self-administered at home after brief training.
- Topical gels are applied daily to the shoulders, upper arms, abdomen, or thighs depending on the product. They provide steady daily levels but carry a risk of transferring testosterone to partners or children through skin contact.
- Patches are applied at night and deliver a consistent dose, but skin irritation at the application site is a frequent complaint.
- Pellets are implanted under the skin every three to six months during a brief office procedure. They’re the most hands-off option but require a minor incision each time.
- Nasal gels are applied inside the nostrils three times a day. They avoid skin transfer concerns but the frequency can be inconvenient.
Injections and generic gels tend to be the most affordable. Brand-name gels, pellets, and long-acting injectable formulations cost more and may face tighter insurance restrictions.
Insurance and Out-of-Pocket Costs
Most insurance plans cover TRT when the diagnostic criteria are clearly met: two documented low morning testosterone readings plus confirmed symptoms. Some insurers require prior authorization, which means your doctor submits your lab results and clinical notes for approval before the pharmacy fills the prescription. Generic injectable testosterone is relatively inexpensive even without insurance, often under $50 per month. Brand-name gels and other formulations can run several hundred dollars monthly without coverage.
Online TRT clinics typically charge a monthly membership fee that bundles consultations, lab orders, and sometimes the medication itself. These fees usually range from $100 to $250 per month and generally operate outside of insurance. The convenience can be worth it for some, but you’re paying a premium compared to going through your regular doctor with insurance billing.
What Happens After You Start
Your first follow-up blood work happens three to six months after starting therapy. The goal is to get your testosterone into the 450 to 600 ng/dL range, which the AUA considers the therapeutic sweet spot. For injections, your blood is drawn midway between doses to check where your levels sit at their midpoint. For gels, the draw happens two to eight hours after application.
Your hematocrit (red blood cell concentration) is checked at baseline, again at three to six months, and annually after that. If it climbs above 54%, therapy is paused until it normalizes. PSA is monitored on a similar schedule for men over 40 who are at elevated prostate cancer risk. After the first year, expect annual blood work and a check-in with your provider.
When You’ll Feel the Effects
Improvements don’t happen overnight, and different symptoms respond on different timelines. Sexual desire and interest tend to improve fastest, typically noticeable within three weeks and reaching their peak effect around six weeks. Mood improvements, particularly reductions in depressive symptoms, follow a similar early trajectory but continue deepening over four to seven months.
Body composition changes take longer. Shifts in fat mass and lean muscle start becoming measurable around 12 to 16 weeks and continue improving for six to 12 months. Muscle strength follows a similar pattern. If you’re not seeing meaningful changes in any domain after six months with confirmed therapeutic testosterone levels, your doctor may reassess whether something else is contributing to your symptoms.
The Commitment Involved
TRT is generally a long-term or lifelong therapy. Once you begin, your body’s own testosterone production decreases further because external testosterone signals your brain to stop stimulating the testes. Stopping abruptly can leave you feeling significantly worse than before you started, at least temporarily, while your body’s natural production slowly recovers. For some men, particularly those who’ve been on therapy for years, full recovery of natural production isn’t guaranteed.
This is worth weighing carefully before starting. TRT isn’t a short course of treatment you take until you feel better and then stop. It’s a commitment to ongoing injections or daily applications, regular lab monitoring, and periodic doctor visits for the foreseeable future.