Low T symptoms: which signs really point to low testosterone
How is low T diagnosed? Tests, timing and cut-offs
Questions to ask your TRT doctor (printable list)
TRT cost: what labs, visits and prescriptions cost
How long does TRT take to work? A realistic timeline
TRT fertility: what it does to sperm and recovery
Stopping TRT: what happens and how long recovery takes
TRT over 50: benefits, risks and what's different
TRT and mood: depression, anxiety and irritability
Enclomiphene vs TRT: how they differ for fertility
What should you expect when starting TRT?
Starting TRT is a process, not a single prescription. Endocrine Society guidelines ask prescribers to confirm low testosterone with symptoms and repeat blood tests. They also look for the cause, talk through fertility and risks, and check baseline labs before treatment begins.
Starting TRT is a process, not a single prescription.
After you start, changes arrive over weeks to months. Your prescriber checks your symptoms, side effects, testosterone and hematocrit through the first year. Hematocrit is the share of your blood made up of red cells.
This page is the overview. Each section covers one part of starting TRT, and the cards at the end lead to deeper guides. It’s general information, not advice about your own treatment.
| Stage | What usually happens | Where it’s covered |
|---|---|---|
| Before treatment | Symptoms, two morning tests, a search for the cause | The next three sections |
| First appointment | History, risks, fertility, choice of product | Preparing for a TRT appointment |
| First weeks | Teaching, supplies, a weekly log | The 90-day checklist below |
| 3 to 6 months | First review with labs | The monitoring section below |
| Year one and beyond | 12-month review, then yearly | The monitoring section below |
How do you know if you might have low testosterone?
Many symptoms get blamed on low testosterone, but few point to it specifically. One European study followed 3,369 men aged 40 to 79, and only three sexual symptoms went along with low testosterone in a way that pointed to a true deficiency. These were fewer morning erections, low sexual desire and erectile dysfunction.
Tiredness, low mood and low stamina were also linked to lower levels. But they have many other causes.
The American Urological Association (AUA) makes the same point. Symptoms of low testosterone are not specific, and they can come from chronic stress, fatigue or depression.
So symptoms are a reason to get tested. They are not a diagnosis.
How is low T confirmed before starting TRT?
With blood tests, done carefully. The Endocrine Society recommends a fasting morning test of total testosterone, then a repeat test to confirm the result.
Timing matters. In men aged 30 to 40, testosterone was 20 to 25% lower at 4 pm than at 8 am.
The AUA says a total testosterone below 300 ng/dL on two early-morning tests is a reasonable cut-off, along with symptoms. (ng/dL means nanograms per deciliter, the usual unit for this test.) The Endocrine Society sets no single cut-off. It gives 264 ng/dL as the lower limit of normal for healthy young men.
That comes from a combined reference range of 264 to 916 ng/dL for healthy, nonobese men aged 19 to 39. Your lab’s range may differ, and your prescriber can explain how to read it.
Once low testosterone is confirmed, your prescriber orders two more tests, LH and FSH. These are the signals the brain sends to the testes. They show whether the problem starts in the testes or in the pituitary gland, a small gland at the base of the brain.
Your prescriber then looks for the cause. Some causes can be reversed.
Obesity, type 2 diabetes, opioids and steroid medicines (glucocorticoids) can all lower testosterone. Testing during an acute illness can also give a falsely low result.
Is TRT right for everyone with low testosterone?
No, and it helps to know that before you start. In the US, testosterone products are approved by the FDA only for men who have low testosterone together with an associated medical condition.
For years, labels also said that safety and effectiveness hadn’t been shown in “age-related hypogonadism.” That means low testosterone without a clear cause. In June 2026, the FDA reviewed the TRAVERSE trial and other evidence. It then asked manufacturers to remove that statement.
Labels and insurance policies may take time to catch up.
The Endocrine Society suggests against routinely prescribing testosterone to all men 65 or older with low levels. But for older men with symptoms and consistently low morning testosterone, it suggests offering treatment case by case. That should come after an open talk about risks and benefits.
That doesn’t mean older men can’t benefit. It means the decision is personal. A clear diagnosis and realistic expectations matter more than a single number.
How should you prepare for your first TRT appointment?
Bring what your prescriber can’t see:
- Every lab report, with the date and time of each draw.
- A full medication list, including supplements, opioids, steroid medicines and any past anabolic steroid use.
- A few weeks of symptom notes: sex drive, erections, energy, mood and sleep.
- Your health history: heart problems, clots, sleep apnea, prostate or urinary symptoms.
- Your plans, especially about children. The Endocrine Society asks prescribers to discuss the benefits and risks of treatment and of monitoring, and to involve you in the decision.
Expect your prescriber to check for reasons not to start. The Endocrine Society advises against starting testosterone if you have any of these:
- You are planning children soon.
- You have breast or prostate cancer.
- Your PSA is raised and a urologist hasn’t looked at it. PSA is a blood test that can flag prostate problems.
- Your hematocrit is high.
- You have severe sleep apnea that isn’t treated.
- You have severe urinary symptoms.
- You have heart failure that isn’t under control.
- You had a heart attack or stroke in the last 6 months.
- You have a clotting disorder.
If you’re seeing a prescriber by telehealth, also ask three things. Where will your blood be drawn?
Who checks your blood pressure? Who will teach you to inject in person?
Three questions work for any treatment decision. What are my options? What are the benefits and harms of each?
How likely are they for someone like me? Our guide to questions to ask your TRT doctor has a printable question list for each visit.
Why should you think about fertility before starting TRT?
Because testosterone therapy lowers sperm production. Testosterone from outside your body tells the brain to turn down LH and FSH, the signals the testes need to make sperm. Your blood testosterone can look healthy on treatment while your sperm count falls, sometimes to zero.
The AUA says testosterone should not be prescribed to men who are trying to conceive now. Its 2024 guideline with the American Society for Reproductive Medicine goes further. It says doctors should not prescribe testosterone to men who want children now or later.
Sperm often come back after you stop, but slowly. Studies of healthy men who used testosterone as birth control found that sperm recovered to 20 million per mL in 67% of men within 6 months. That rose to 90% within 12 months.
The AUA warns that these results may not apply to men with low testosterone. Some infertile men may never get their sperm production back.
Low sperm counts on TRT are not reliable birth control either. In a World Health Organization study, pregnancies still happened when men’s counts were very low but not zero.
If you might want children, raise it before the first prescription. The Endocrine Society says men who aren’t sure about future children may want to consider banking sperm. A semen analysis before you start can also show whether you need birth control.
Which form of testosterone will you use?
Your prescriber will choose with you. In the US, the FDA lists oral, gel, patch, buccal (cheek) and injection forms as approved. The Endocrine Society says the choice should weigh your preference, how the product behaves in the body, its side effects, the effort of treatment and its cost.
| Form | How it’s used | One label point worth knowing |
|---|---|---|
| Testosterone cypionate or enanthate vial | Injected into a muscle, as the labels say; some prescribers choose the SubQ (under the skin) route off-label | Not for men with serious heart, liver or kidney disease |
| Xyosted autoinjector | Injected under the skin | Blood pressure is now a standard warning, not a boxed one |
| Testosterone gel | Applied to the skin daily | Boxed warning: children have been affected by contact with application sites |
| Oral testosterone undecanoate | Capsules | Not the older “alkylated” oral type the AUA advises against |
The AUA also prefers commercially made products over compounded testosterone when possible. Compounded means mixed by a pharmacy for one patient.
What does TRT cost?
It depends on the form, your insurance and where you’re treated, so there’s no single price. The best public benchmark is Medicare’s drug spending data.
In 2024, Medicare Part D paid an average of about $37 per fill for generic testosterone cypionate. It paid $168 for generic testosterone, $788 for the Xyosted autoinjector and $1,055 for the oral capsule Jatenzo.
Those figures are what Medicare plans paid in total before rebates. They are not what you’d pay at the counter, and a fill can cover different lengths of time. We couldn’t find a primary source for cash prices, so we don’t give one.
In that data, generic cypionate cost the least of these. Brand gels, autoinjectors and oral products cost far more.
The drug is only part of the bill. Visits and labs add up, because monitoring repeats the same blood tests in the first year. A 2026 study of US hospital price lists found a median price of $84.90 for a total testosterone test, with wide variation.
A 2022 analysis compared 12 months of injected testosterone. It cost $1,586 to $4,200 through three online platforms. Insurance changed the price: at one academic center it cost $134 to $1,333 depending on coverage.
Your insurance may need prior authorization. That means your plan approves the prescription before it covers it, and approval isn’t a promise to pay.
Ask about it early. Also ask what your plan covers if one form isn’t approved.
How long does TRT take to work?
Different changes arrive on different clocks. A review of treatment studies found that interest in sex improved after about 3 weeks and leveled off by about 6 weeks.
Changes in fat, muscle and strength took 12 to 16 weeks to show, and kept developing for 6 to 12 months. Bone density changes took 6 months or more.
With injections, your levels also take time to settle. Testosterone cypionate has a half-life of about eight days. That means half of a dose is still in your body eight days later.
Each injection adds to what’s left of the last one, so levels build over the first several weeks. Little changes in the first week, and that’s normal.
Not everything improves. In the Testosterone Trials of men 65 and older, a year of treatment gave a moderate benefit for sexual function and some benefit for mood.
It gave no benefit for vitality or walking distance. The AUA says patients should be told that the evidence is inconclusive for energy, fatigue, thinking and quality of life.
That’s why the first real check is at 3 to 6 months, not in the first weeks. The testosterone level calculator estimates how your levels build on an injection schedule.
What side effects should you watch for?
The most common is a rise in hematocrit. In a combined analysis of trials in older men, men on testosterone were nearly four times as likely to have a hematocrit above 50%. It causes no symptoms early on, which is why blood tests track it.
The form matters. In one clinic review, hematocrit above 50% showed up in 66.7% of men on injections, 12.8% on gels and 35.1% on pellets. The groups differed in age and starting levels, though.
Other common effects include acne, small rises in blood pressure, and smaller testes with lower sperm counts.
In 2025, the FDA said required studies confirmed a blood pressure rise with all testosterone products. It required blood pressure warnings on their labels.
Less often, men notice breast tenderness or ankle swelling. Testosterone can also make sleep apnea worse, especially in men with obesity or chronic lung disease.
Tell your prescriber about new loud snoring or daytime sleepiness. Gel adds one more risk: it can pass to partners and children through skin contact.
On the heart, the TRAVERSE trial followed 5,246 men who had heart disease or were at high risk. Major heart events happened in 7.0% of men on testosterone gel and 7.3% on placebo. But atrial fibrillation (an irregular heartbeat), acute kidney injury and pulmonary embolism (a blood clot in the lung) were more common on testosterone.
Get emergency help for chest pain, sudden shortness of breath, or a painful, swollen leg. Tell your prescriber about ankle swelling, nausea, changes in skin color, and erections that are too frequent or won’t go away.
How is TRT monitored in the first year?
The two main guidelines agree on the idea: regular checks of testosterone, hematocrit and symptoms. They differ on timing:
| Check | Endocrine Society | AUA |
|---|---|---|
| Testosterone | 3 to 6 months, depending on the product, then 12 months and yearly | Gels and patches: 2 to 4 weeks. Cypionate or enanthate: no earlier than 3 to 4 injection cycles. Then every 6 to 12 months |
| Hematocrit | Baseline, 3 to 6 months, then yearly | Baseline, then every 6 to 12 months |
| Symptoms and side effects | 3 to 12 months, then yearly | Re-evaluated within 3 months |
Some men are also offered prostate checks. This applies to men 55 to 69, and to men 40 to 69 at higher risk, who choose it. The Endocrine Society checks PSA and does a prostate exam before starting, and again 3 to 12 months later.
PSA tends to rise a little on treatment. Ask your prescriber what they look for.
Hematocrit is the number most likely to prompt a change. The Endocrine Society tells prescribers to pause therapy if hematocrit goes above 54%. They should look for causes such as sleep apnea before restarting.
Why the difference? Both guidelines time the first check to the product. The AUA says gels and patches can be checked at two to four weeks.
Cypionate or enanthate should wait until levels have settled, no earlier than three to four injection cycles. The Endocrine Society’s first check is at 3 to 6 months, depending on the product. Ask your prescriber which schedule they follow, and book the first draw before you leave the first visit.
The timing of the draw matters too, because injected testosterone rises and falls between injections. A “trough” draw is taken just before your next dose, when levels are lowest. The blood test timing planner helps you plan the right day.
Don’t change your treatment because of one result. Talk to your prescriber.
What should you do in your first 90 days on TRT?
Use this as a checklist. Tick each step off as you go.
Before you start
- Diagnosis confirmed with two morning tests, and the likely cause discussed.
- Decision made about children, including semen analysis or sperm banking if relevant.
- Baseline hematocrit done, plus PSA if it applies to you.
- Form of testosterone chosen; prior authorization started if your plan needs it.
- Baseline written down: sex drive, erections, energy, mood and sleep rated 1 to 5, plus weight and blood pressure if you can measure them.
Week 0: setting up
- Injection technique taught in person by a nurse, pharmacist or clinician. For example, the Xyosted label tells prescribers to instruct patients and point them to the Instructions for Use.
- Supplies in hand: medication, syringes and needles as prescribed, alcohol pads, and a sharps container.
- Sharps plan: needles go straight into the container. Dispose of it by local rules when it’s about three-quarters full. Never put needles loose in the trash, toilet or recycling.
- Storage sorted: cypionate vials at 68 to 77°F, away from light and out of reach of children.
- If you use gel: wash your hands right after applying. Keep children and women away from unwashed or uncovered sites.
Weeks 1 to 12
- The same ratings logged once a week, at about the same time.
- New skin changes, breast tenderness, ankle swelling or snoring noted.
- Refill reminder set a week or two before supply runs out.
- For a missed injection: no doubling up; call your prescriber or pharmacist.
Around 3 months
- Follow-up labs booked and drawn, with the time since your last injection or application recorded.
- Log and questions brought to the review visit.
Be realistic about what a log can do. The AUA doesn’t recommend questionnaires to track how well treatment is working.
Your notes are a way to help the conversation, not a test. Still, a steady weekly record is far more useful at the review than memory.
Who does what when you start TRT?
Several people share the work, and steps without an owner tend to slip:
- You: share your full history and plans, keep medication and sharps safe, log symptoms, book labs and report side effects.
- Your prescriber: confirms the diagnosis, orders labs, discusses risks and benefits, and writes and renews the prescription.
- The nurse or clinic: teaches injection technique in person and checks it later.
- The pharmacy: fills prescriptions and refills, and helps with prior authorization paperwork and storage questions.
- The lab: draws your blood. Ask for a copy of every result.
The most common gaps are fertility, which nobody raises until too late, and the 3 to 6 month labs, which nobody books. Book that draw at your first visit.
Prescriptions: testosterone is a Schedule III controlled substance. That means a prescription can’t be filled more than six months after it was written. It also can’t be refilled more than five times.
A fourth temporary federal extension lets doctors prescribe controlled medicines by telemedicine through December 31, 2026. The rules may change after that, so check the current position.
How do you know if TRT is working for you?
By comparing like with like. Rate the same symptoms the same way each week.
Compare month three with your baseline, not with how you remember feeling. Changes in sex drive tend to come first and body changes later, so a quiet first month isn’t a failure.
At the 3 to 6 month review, bring your log, your lab results with draw times, and a short list of what has and hasn’t changed. Your prescriber will look at three things: whether your symptoms improved, whether you’ve had side effects, and whether your levels are where they expected.
What if TRT isn’t working or you want to stop?
Suppose your levels are in range at 3 to 6 months but your symptoms haven’t improved. The AUA says clinicians should then discuss stopping treatment. That talk may also cover the timing of your labs, other causes of your symptoms, or a different form of testosterone.
Stopping is possible, but plan it with your prescriber. Treatment has turned down your own production. Symptoms of low testosterone can return while it restarts, and sperm production can take months to recover.
What if you don’t have a prescriber yet?
Start with the record. Whether or not you’ve found a prescriber, TRTracker keeps your symptoms, lab results and questions in one place, so your first appointment starts from facts.