Low hormone levels on HRT usually mean the dose, the route or the timing of your blood test needs looking at, and all of that can be changed. A prescription that leaves you with levels below the guideline range is not a verdict on you, and you can ask for it to be adjusted.
People tell me about this all the time: months on hormones, a blood result that comes back low, and very little changing in the mirror. It is frustrating, and it is also one of the most fixable problems in gender-affirming care. Nobody is imagining it, and your body is not "not responding" in most cases. More often the prescription was never aimed at the right place.
What hormone levels should HRT aim for?
The Endocrine Society guidelines and WPATH Standards of Care 8 both describe the aim of hormone therapy in terms of bringing levels into the typical range for the gender someone is transitioning towards, while keeping the person safe and well. These are the commonly cited targets, and your own laboratory's reference ranges and units may look different.
For trans women and other people taking oestrogen, the usual aim is an oestradiol level somewhere around 100 to 200 pg/mL (roughly 370 to 730 pmol/L), with testosterone brought down into the range typical for cis women. For trans men and other people taking testosterone, the usual aim is a total testosterone level in the typical male range, which many labs show as somewhere around 10 to 35 nmol/L (the Endocrine Society targets a mid-range figure, roughly 14 to 24 nmol/L). Non-binary people may want something different, and that is a perfectly good goal. Your target is a conversation about what you want your body to do.
Units catch people out. Oestradiol is reported in pg/mL in some countries and pmol/L in others, and testosterone in ng/dL or nmol/L. Check the unit printed next to your result before you decide anything is low.
Why are my levels low on HRT?
There are several common reasons, and they often overlap. Working through them one at a time is the quickest way to find the answer.
The dose was set cautiously and never revisited
This is the one I hear about most. Many prescribers have little training in gender care, so they start low and stay there. Starting low is reasonable. Staying low once the bloods show it is not working is a different matter. Caution is not needed in this area any more than in any other part of medicine, and a dose that gives no meaningful effect for months is not the safe option, because the unwanted changes of the wrong hormones carry on in the meantime.
The route does not suit your body
Absorption varies a lot between people. Oestrogen taken by mouth is largely processed by the liver before it reaches the rest of the body, and tablets swallowed whole can give lower and less predictable oestradiol than patches, gels, sublingual use or injections. Patches that lift, gels that are washed off too soon, or gels applied to skin that someone else touches can all leave levels lower than the prescribed dose suggests. Testosterone gel can be affected in the same ways, and the dose absorbed through the skin differs widely from person to person. A change of route is often more effective than simply raising the dose.
The blood test was taken at an unhelpful moment
Levels rise and fall across a dosing cycle. Injectable testosterone and oestrogen peak soon after the injection and drop towards the end of the interval, so a test taken just before the next dose will show the lowest point. That can be useful, as it tells you whether levels fall too far between injections, but it needs interpreting as a low point, not an average. Gels and patches should be tested at a consistent time too. If you are unsure when your test was taken in relation to your dose, ask for that to be recorded and compared.
Binding proteins and other medicines
Much of the hormone in your blood is attached to a protein called sex hormone binding globulin (SHBG), and only the unattached part is free to act on your tissues. Oral oestrogen tends to raise SHBG, which can make a total testosterone or oestradiol figure look different from what your body is actually using. Some other medicines also change how hormones are processed. Tell your prescriber about everything else you take, including supplements.
Testosterone is still high on oestrogen
For trans women, a low oestradiol result often goes hand in hand with testosterone that has not come down. When oestradiol reaches a good level, it suppresses the body's own testosterone production in many people. If it has not, the usual options are raising or changing the oestrogen, adding a testosterone-lowering medication, or both. Spironolactone, cyproterone and GnRH analogues are the ones you will hear about, and which one suits you depends on your health, your goals and what is available where you live.
Doses are missed, or the supply is inconsistent
Skipped doses, a gap between prescriptions, a pharmacy that cannot get your brand, or splitting a dose to stretch it out will all show up in your bloods. If supply is the problem, say so plainly. It is a very common problem and a prescriber can only fix what they know about.
Do the numbers matter more than the changes in my body?
Both matter, and neither tells the whole story alone. Bloods show what is circulating. Your body shows what that is doing. Breast development, fat distribution, skin softening, body hair, a deeper voice, the end of periods, muscle changes and how you feel all develop at different speeds and to different degrees in different people, partly down to genetics. Someone with a perfect-looking result and few changes after a year deserves a conversation, and so does someone whose levels are lower than the target but who is happy with how things are developing.
The thing I would push back on is being told that a low result does not matter because you "look fine", or that you should be patient without any change to the plan. Patience is not a treatment. If something is not working, the next step is to change something.
What should I ask my prescriber if my levels are low?
It helps to go in with specific questions. You can ask what your results are compared with your target range, and what the target is based on. You can ask when the sample was taken in relation to your last dose. You can ask whether a different route, a different formulation or a split dose might suit you better. If you are on oestrogen, ask what your testosterone level is and whether it is low enough. If you are on testosterone, ask about your oestradiol and about your haematocrit, the proportion of your blood made up of red blood cells, which should be monitored as testosterone is increased. Then ask what will be checked next and when.
It is also reasonable to ask for a written plan. "We will increase to X, recheck in a given number of weeks, and review" is a good answer. "Let's wait and see" with no recheck is not.
Is a higher dose always better?
No. Once levels are in the target range, going above it does not usually speed up changes, and it can add risks. Higher oestrogen doses, particularly by mouth, bring more risk of blood clots in some people. Higher testosterone can push red blood cell counts up and bring more acne or hair loss than someone wants. Your age, smoking, family history, weight, blood pressure and other conditions all affect where the safest range sits for you. The aim is the lowest dose that gives you the changes you want and the levels the guidelines describe, and monitoring is what lets you find it. Informed consent works both ways: the information is yours, and so is the decision.
What if my doctor will not change my dose?
This happens, and it is not a reflection on you. Expertise in this area is thin, waiting lists run into months or years, and the political climate has made some prescribers wary of touching anything that looks like gender care. If a doctor is declining to adjust a prescription without a clinical reason, or refusing to continue it, you are entitled to ask for the reasoning and to seek another opinion.
If you want practical medical help with dosing, prescribing and monitoring from clinicians who work with current international standards, GenderGP can help with access to affirming medical care, including hormones, blockers, prescribing and monitoring.
I would be cautious about adjusting doses yourself or sourcing hormones without monitoring. The reason is not moral. Without bloods, you cannot tell whether you have fixed the problem or created a new one, and the people who go down that route are often the ones who most need a prescriber to be listening.
Can I talk this through before I speak to my prescriber?
Yes. You can bring your results, your dose, your route and what is or is not changing to Sammy here, and think through what the numbers might mean and what to ask for. Sammy will not be adjusting your medication, but can help you plan the conversation and rehearse how to say it, which makes it easier to be heard.
Low levels are one of the most common reasons transition feels slower than it should. They are also one of the most solvable. You are asking for treatment to do what it is meant to do, and that is a completely reasonable thing to expect.
If there is a topic that you would like me to cover, just let Sammy know.
Dr Helen Webberley, Gender Specialist and Medical Educator
Comments