What is a typical TRT blood work schedule?
A typical TRT blood work schedule has four stops. There are baseline tests before you start, a first check in the weeks or months after, another at about 12 months, then regular checks.
The big guidelines don’t agree on every date, and your prescriber sets yours. This page covers timing only. For what each test measures, see our TRT blood work overview.
| When | What the guidelines say | Source |
|---|---|---|
| Before starting | Two early-morning total testosterone tests, a hematocrit, and a PSA for men in the screening group | Endocrine Society, AUA |
| First follow-up | Testosterone 2 to 4 weeks after starting (AUA), or testosterone and hematocrit at 3 to 6 months (Endocrine Society) | AUA, Endocrine Society |
| 12 months | Testosterone and hematocrit; the PSA window (3 to 12 months) closes | Endocrine Society |
| After that | Every year (Endocrine Society), or every 6 to 12 months once stable (AUA) | Both |
What blood work do you need before starting TRT?
Baseline tests do two jobs. They confirm that testosterone is really low. They also give you a starting point to compare later results against.
Two morning testosterone tests. Both guidelines ask for total testosterone on two separate days. The Endocrine Society asks for fasting, early-morning samples, because testosterone is highest in the morning and can fall after eating.
The AUA also wants two early-morning tests, at the same lab with the same test method. It treats a level below 300 ng/dL as a reasonable cut-off. Symptoms count as much as the number, and neither guideline diagnoses low testosterone from a lab value alone.
The total testosterone guide covers the ranges.
LH and FSH. These pituitary hormones help show why testosterone is low. The problem may be in the testes, or in the signal from the brain.
The AUA lists LH with a repeat testosterone if the first level is low. It lists FSH as optional for men interested in fertility.
Hematocrit. This is the share of your blood made up of red cells. Testosterone raises it, so a baseline matters.
The Endocrine Society advises against starting testosterone when hematocrit is already high. Its risk table names a hematocrit above 48%, or above 50% at high altitude.
The AUA asks for a baseline to confirm it is under 50%. It says to hold off on testosterone until a baseline above 50% is explained.
The hematocrit guide explains why it matters.
PSA. This is a prostate-specific antigen test, often done with a prostate exam. The Endocrine Society ties it to shared decision-making, where you and your prescriber decide together.
It applies to men aged 55 to 69 who choose prostate monitoring, and to men 40 to 69 at higher risk. The AUA lists a baseline PSA for men over 40. The PSA page has more.
Often added. Many prescribers add a complete blood count, a metabolic panel and a lipid panel. The AUA lists estradiol at baseline for men with breast enlargement, and as optional for all men.
Which tests you get depends on your history and your prescriber.
When should your first TRT blood test be after starting?
Here the guidelines differ. The AUA’s follow-up table lists a testosterone check 2 to 4 weeks after starting, depending on the type of therapy.
The Endocrine Society measures testosterone and hematocrit at 3 to 6 months, depending on the product. It reviews symptoms and side effects at 3 to 12 months.
For cypionate or enanthate shots, the AUA’s text adds a timing rule. Testosterone should be measured after several injection cycles, once levels have settled, and no earlier than three to four cycles.
Why not test as early as possible? Testosterone cypionate has a half-life of about eight days when injected into muscle. Half-life is the time it takes the body to clear half of a dose.
So levels keep building for several weeks before they settle into a repeating pattern. The Endocrine Society says testosterone should be measured once that steady state is reached.
Hematocrit is slower still. In a review of treatment studies, red-cell effects were clear at about 3 months and peaked at 9 to 12 months. An early result is a snapshot, not the final picture.
Want a date to aim for? Our free timing planner works out the draw window from your last injection and your schedule.
Does your TRT blood work schedule change after the first year?
Once results are stable, the Endocrine Society checks testosterone and hematocrit every year. It also reviews symptoms and side effects. After the first year, PSA follows standard prostate screening rules for your age and race.
The AUA’s table lists testosterone and hematocrit every 6 to 12 months once stable. It may be sooner, depending on earlier values. The aim is to keep hematocrit below 54%.
Two other sources add to this. The DEPO-Testosterone label asks for hemoglobin and hematocrit checks from time to time in long-term use. It also notes that cholesterol may rise.
In February 2025 the FDA told makers of testosterone products about label changes for every product. The new labels add the TRAVERSE heart-safety results.
They also add blood pressure information. Required studies confirmed that all testosterone products raise blood pressure. Blood pressure isn’t a blood test, so ask your prescriber how they want it followed.
Men with osteoporosis (thin, weak bones) are a special case. The Endocrine Society says to measure bone density after 1 to 2 years of treatment.
Should you get blood work at trough or midpoint?
This is where most confusion comes from. It’s why two men on the same treatment can get different numbers.
With injections, testosterone rises to a peak within a few days of the shot. It falls to a trough, its lowest point, just before the next one. A draw at each point reads very differently.
Neither is wrong. What matters is knowing which one you got. Our peak and trough guide explains what each number means.
- Midpoint. For testosterone cypionate or enanthate, the Endocrine Society measures testosterone midway between injections. The AUA says mid-cycle draws have long been advised for convenience. It adds that this timing can’t define peak and trough levels.
- Trough. Some prescribers ask for a draw just before the next injection, to see the lowest point of the cycle. Neither guideline sets this for cypionate or enanthate, so it is your prescriber’s choice.
- Other products. The Endocrine Society gives different timing for other products. For gels, it is 2 to 8 hours after applying, after at least a week of use. For pellets, it is the end of the dosing interval. Follow the instructions you were given for yours.
Whatever timing your prescriber picks, use it every time. A trough in March and a midpoint in September can’t be compared.
Why do morning draws matter?
For diagnosis, the Endocrine Society asks for early-morning samples because testosterone peaks in the morning. Once you are on treatment, its timing rules follow the product, not the clock. That means midway between shots for cypionate, or a set number of hours after a gel.
So ask your prescriber whether the time of day matters for you. Morning slots are also handy if your panel needs fasting.
What can change your TRT blood work schedule?
The guideline schedule assumes nothing changes. Real life resets the clock. Your prescriber will often want an extra set of labs after any of these:
- A new product or route. Moving from gel to injections, or to a different injection schedule, changes the shape of your levels. The draw timing may need to change too.
- A change in treatment. After any change your prescriber makes, levels take several weeks to settle before a new result means much.
- A new prescriber or clinic. They may want their own baseline, or a different draw timing.
- A result outside the range. These are usually rechecked, sometimes within weeks.
- Other medicines or conditions. A new medicine, a big change in weight, or a diagnosis such as sleep apnea can change what your prescriber wants to watch.
Call your prescriber if you notice breast swelling or tenderness, ankle swelling, a headache, or urinary symptoms that are getting much worse. The DEPO-Testosterone label lists breast enlargement (gynecomastia), ankle swelling and headache. The Endocrine Society lists much worse urinary symptoms as a reason to see a urologist.
Get emergency help for chest pain, sudden shortness of breath, signs of a stroke, or a painful, swollen leg. The label lists heart attack, stroke and blood clots in the veins among reported reactions.
What happens if a TRT blood test comes back high?
Your prescriber decides, and there are several options. Don’t stop, skip or change your treatment on your own because of a number. Call and ask what they want you to do.
Here is what the guidelines tell prescribers. If hematocrit rises above 54%, the Endocrine Society says to stop therapy until it comes down. Then it checks for causes such as low oxygen levels and sleep apnea, and decides how to restart.
The AUA also uses 54% as the upper limit.
For PSA, the Endocrine Society advises a urology referral in two cases. One is a rise of more than 1.4 ng/mL in the first 12 months. The other is a confirmed PSA above 4 ng/mL.
The hematocrit guide explains why it rises and what else can push it up. Estradiol has its own page too.
Why can results differ between labs and test kits?
Two men with the same testosterone level can get different numbers from different labs. One man can see his number jump just by switching labs.
- Reference ranges are set by each lab for its own method and population.
- Methods differ. Testosterone and estradiol can be measured by immunoassay or by mass spectrometry. The two don’t always agree at low levels.
- Units differ. US labs report testosterone in ng/dL; many other countries use nmol/L (1 nmol/L is about 28.8 ng/dL). Some reports show hematocrit as a fraction (0.45) instead of a percentage (45%).
The simplest fix is to use the same lab for routine checks when you can. The AUA advises this for baseline tests. Keep the range and unit next to each result.
Mail-in finger-prick kits are a different case. The guideline schedules and cut-offs on this page, including the 54% hematocrit mark, don’t address home kits. Neither guideline says how to compare a kit result with a lab result.
Ask your prescriber first whether they accept the results.
How do you prepare for a TRT blood test?
- Confirm the timing. Ask whether your prescriber wants a trough, a midpoint or a set day after your injection. Write it down.
- Book the right time of day. Ask whether it matters for your product.
- Ask about fasting. It is needed for diagnosis and for glucose or lipid tests. It is often not needed otherwise.
- Drink as usual. Dehydration can raise hematocrit without any real increase in red cells.
- Bring your log. Note the date and time of your last injection. Add anything unusual that week: illness, travel, a missed shot, a hard workout.
- Keep the full report. Ask for the PDF or portal copy with units and the lab’s reference ranges.
What should you ask your prescriber about your results?
- Was this draw at the timing you wanted? How does that change how you read it?
- Which results are you watching most closely for me, and why?
- Is anything trending, even if it’s still in range?
- When do you want the next labs, and should the timing be the same?
- What should I do if I get a flagged result between visits?
For a fuller question list, see the TRT blood work overview, which covers what each marker on your panel means.
How can you keep track of your results?
A year of TRT can mean four or five lab reports from different labs, with different units and ranges. Trends matter, and a pile of PDFs hides them. For the first year, the TRT timeline guide shows what tends to change and when.
Whatever you use, a spreadsheet or an app, record the same four things for every draw. Note the date, the result with its unit, the lab’s reference range, and how many days it was after your last injection.
With those, you and your prescriber can tell a real change from a different point in the injection cycle.