Getting on testosterone replacement therapy (TRT) requires a documented diagnosis of low testosterone, which means blood work, a clinical evaluation, and a prescription from a licensed provider. The process typically takes two to four weeks from your first blood draw to starting treatment, though it can move faster through a telehealth men’s health clinic and slower through insurance-based routes. Here’s what the process actually looks like, step by step.
Step 1: Get the Right Blood Work
The foundation of a TRT prescription is two separate morning blood draws showing consistently low testosterone. Insurance companies and clinical guidelines both require this. The draws need to happen between 8 a.m. and 10 a.m., when testosterone peaks in your body, and you should be fasting. The two tests must be at least one week apart.
Total testosterone is the primary number. The Endocrine Society sets the lower limit of normal at 264 ng/dL, while most insurance companies use 300 ng/dL as their cutoff. If your total testosterone falls below 300 ng/dL on both draws, you meet the standard threshold. Some insurers will also accept levels below 350 ng/dL if your free testosterone is simultaneously low (under 50 pg/mL).
It’s worth knowing that these cutoffs were developed from samples of older men and don’t account for age. Research published in the Journal of Urology found that healthy men aged 20 to 29 typically have testosterone in the 409 to 575 ng/dL range, meaning a 25-year-old at 310 ng/dL would technically clear the 300 cutoff but still be well below normal for his age. Some providers, particularly at men’s health clinics, will treat based on symptoms combined with levels in that borderline zone of 200 to 400 ng/dL.
Beyond total testosterone, your provider will order several other labs before prescribing: LH and FSH (hormones that signal your brain’s communication with your testes), prolactin, hemoglobin and hematocrit (red blood cell markers), and PSA (a prostate screening value). These help determine what’s causing your low testosterone and whether it’s safe to start treatment.
Step 2: Get Evaluated for Symptoms
Low numbers alone aren’t enough. Guidelines require both consistently low testosterone and symptoms of deficiency. Providers look for a combination of low libido, erectile difficulty, fatigue, depressed mood, brain fog, loss of muscle mass, increased body fat, and reduced motivation. You don’t need every symptom, but you do need to clearly describe how low testosterone is affecting your daily life.
Your provider will also want to rule out other causes. Thyroid disorders, sleep apnea, obesity, depression, and certain medications can all suppress testosterone or mimic its deficiency symptoms. If one of these is the primary driver, treating it first is the standard approach before jumping to TRT.
Step 3: Choose Your Provider
You have three main options for where to get prescribed, and each has a different timeline and experience.
Primary care doctor: Your regular doctor can diagnose and prescribe TRT. The upside is insurance coverage and continuity of care. The downside is that many PCPs aren’t deeply experienced with hormone optimization, and the process of getting labs ordered, waiting for results, scheduling a follow-up, and navigating prior authorization can stretch to four to six weeks.
Urologist or endocrinologist: These specialists have more expertise in hormonal issues. A urologist is a common choice, though some urology practices have stopped managing TRT directly and refer patients to specialty clinics instead. An endocrinologist is particularly useful if your bloodwork suggests a pituitary issue or another complex cause. Expect a referral wait time of two to four weeks before your first appointment, plus the standard two-draw diagnostic timeline.
Men’s health or telehealth clinic: Online TRT clinics have become extremely popular because they streamline the process. You typically order labs through the clinic (often at a local lab), do a video consultation, and can have a prescription within one to two weeks. The trade-off is cost: most of these clinics operate outside insurance, charging monthly fees that typically range from $150 to $250 including medication and monitoring. They also tend to prescribe more readily for borderline cases.
Navigating Insurance Approval
If you’re going the insurance route, expect a prior authorization process. Insurers like UnitedHealthcare require documentation of two morning blood draws (with exact dates and times recorded) showing total testosterone below 300 ng/dL. Both results, along with your symptom history, are submitted on a prior authorization form before your pharmacy can fill the prescription.
If your levels are borderline, say 310 or 330 ng/dL, insurance will likely deny coverage. At that point your options are to appeal with additional documentation (such as free testosterone levels), pay out of pocket, or work with a cash-pay clinic. Generic testosterone cypionate for injections is relatively affordable even without insurance, often $30 to $75 per month at a retail pharmacy with a discount card.
Treatment Options You’ll Choose From
Once prescribed, you and your provider will decide on a delivery method. Each has different convenience, cost, and consistency profiles.
- Injections (most common): Testosterone cypionate or enanthate, injected into muscle or subcutaneous fat, typically once or twice per week. Most men learn to self-inject at home. This is the cheapest option and gives the most control over dosing, but levels can fluctuate between injections.
- Topical gels: Applied daily to the shoulders or upper arms. Gels provide steadier day-to-day levels and avoid needles, but they’re more expensive, can transfer to partners or children through skin contact, and absorption varies between individuals.
- Subcutaneous pellets: Small pellets implanted under the skin of the hip in a quick office procedure. They release testosterone over three to six months, so you don’t have to think about daily or weekly dosing. The downsides are that dose adjustments aren’t possible once they’re in, and levels can sometimes run higher than intended.
Injections are by far the most commonly prescribed form, especially through telehealth clinics, because of their low cost and easy dose adjustments.
What to Expect in the First 12 Weeks
TRT isn’t an overnight transformation. Changes roll in gradually over distinct windows.
In the first two weeks, many men notice a subtle lift in motivation and focus. Fatigue and irritability often start to ease. Libido may tick up slightly, but it’s rarely dramatic this early. You won’t see any body composition changes yet.
By weeks three and four, stress tolerance typically improves and mood feels more stable. Morning erections and sexual interest increase noticeably for many men. This is the point where most people feel confident something is actually working.
Weeks five through eight bring more consistent improvements in libido and erectile function. Mood stabilizes into a predictable baseline rather than swinging day to day. If you’re strength training, you may start noticing clothes fitting differently around the waist and chest as early body recomposition begins.
By weeks nine through twelve, the mental and sexual benefits level off at a stronger, steadier baseline. Body composition changes become more visible, particularly if you’re training and eating well. Research shows that meaningful shifts in fat mass and lean muscle really take shape around week 12, then continue stabilizing over the following six to twelve months.
Ongoing Monitoring and Safety
TRT is not a one-time prescription. It requires regular blood work to keep things safe and dialed in. Most providers check your levels at six weeks, then at three months, then every six to twelve months once stable.
The most important safety marker is hematocrit, which measures the percentage of your blood made up of red blood cells. Testosterone stimulates red blood cell production, and if hematocrit climbs too high, it thickens your blood and raises cardiovascular risk. Current guidelines recommend stopping or reducing TRT if hematocrit reaches 54%, and some providers use a more conservative cutoff of 52%. If your hematocrit was already at or above 50% before starting, your provider should monitor it especially closely.
PSA is also tracked regularly to screen for prostate changes. Estradiol (estrogen) levels are checked if you develop breast tenderness, water retention, or paradoxically worsening libido, which can signal that your body is converting too much testosterone into estrogen.
One reality to understand going in: TRT is generally a lifelong commitment. Exogenous testosterone suppresses your body’s natural production, and stopping abruptly can leave you with levels lower than where you started. Some men use additional protocols to restart natural production if they decide to come off, but recovery isn’t guaranteed and can take months. Fertility is also affected, since TRT suppresses sperm production. If having children is in your plans, discuss this with your provider before starting, as alternative treatments exist that can raise testosterone while preserving fertility.