What low testosterone actually feels like, how it is diagnosed, what treatment and monitoring involve, and how to find out where you stand. Written for men trying to work out whether this is their problem or not.
The short version. Low testosterone is recognised from symptoms first, with a morning blood test to confirm the picture and rule out the other things that cause the same feelings. Treatment is prescription-only, is decided case by case by a doctor who has assessed you, and needs ongoing monitoring for as long as you stay on it. Anyone offering it off the back of a questionnaire alone is not doing it properly.
Most men who come to us do not arrive saying “I think my testosterone is low”. They arrive saying they are tired all the time, that they have lost their edge, that they train as hard as they ever did and get less back, or that their interest in sex has quietly disappeared and they have not wanted to say it out loud.
The symptoms most often associated with low testosterone are:
Not one of those symptoms is specific to testosterone. Every one of them is also caused by an underactive thyroid, iron deficiency, poor sleep, undiagnosed diabetes, low mood, alcohol, or simply the accumulated load of a demanding life. That is exactly why the assessment matters more than the test. A testosterone result read in isolation is how men end up on treatment they never needed — and how men with a treatable thyroid or metabolic problem end up missing it.
Diagnosis rests on two things together: symptoms that fit, and blood results that support them. The symptoms are what bring you in and what treatment is judged against; the bloods tell your doctor what is driving them.
Testosterone follows a daily rhythm and is highest in the morning, so the sample should be taken early, ideally before 10am and after a normal night's sleep. A result taken in the afternoon can look low in a man whose testosterone is entirely normal.
Total testosterone on its own is a blunt instrument. Much of the testosterone in your blood is bound to a carrier protein called SHBG and is not available to your tissues, so two men with an identical total can have very different amounts actually working. A proper hormone panel therefore looks at:
Where testosterone is genuinely low, the next question is why. LH and FSH help separate a testicular cause from a pituitary one. Weight, sleep apnoea, alcohol, certain medications and poorly controlled blood sugar all suppress testosterone and are frequently reversible — which is why a thorough assessment often improves a man's numbers without a prescription at all.
You do not need to come to us for the blood draw. When you book a hormone consultation with blood test, we order the Quantum hormone panel and direct you to an accredited laboratory near you for a quick, professional blood draw. Your results come straight back to your doctor, who reviews them before your video consultation.
If you already have recent bloods — from your GP, an occupational health check, or another provider — bring those instead. There is no sense in repeating tests you have just had. Book the Full Consultation (your own bloods) and share them with your doctor ahead of the appointment. If you would rather get the Quantum panel done first and then book a consultation, it is also available directly from The Health Lab.
TRT is a prescription-only medical treatment for men with confirmed testosterone deficiency. It is not a supplement, not a performance aid, and not something that should be sold from a questionnaire.
Where a doctor concludes that testosterone deficiency is present and that treatment is appropriate, testosterone replacement can bring levels back into the normal range. Men who genuinely need it often describe the return of energy, motivation, libido and the ability to build strength again. It can make a real difference to quality of life.
It also carries consequences that deserve to be understood before you start rather than after:
None of that is a reason to avoid treatment where it is genuinely indicated. It is a reason to be assessed properly, monitored properly, and treated by a doctor who will tell you when the answer is no.
A good proportion of men who ask us about testosterone do not need it. Their symptoms turn out to be driven by sleep, thyroid function, iron, alcohol, an unrecognised metabolic problem or their mental health — and treating that is what makes them feel better. We would far rather tell you that than start you on a lifelong treatment you did not need. If your assessment points somewhere else, we will say so, and we will help you deal with what we find.
Men on testosterone replacement need regular blood tests — typically at intervals through the first year while the dose is settled, and at least annually after that. Monitoring covers testosterone levels, haematocrit, PSA where appropriate, and the metabolic markers that tend to move alongside. Symptoms are reviewed at the same time, because how you feel is at least as informative as the numbers.
If you are already on testosterone that was started elsewhere — including abroad or online — and nobody is monitoring you, that is worth sorting out. We are happy to review existing treatment, look at what has been done so far, and put proper monitoring in place.
Everything is priced before you book, with no consultation fee added afterwards.
Medication, where a doctor considers it appropriate, is dispensed by a pharmacy of your choice and charged by them — we prescribe, we do not dispense. Monitoring bloods are charged separately as they arise.
Book a hormone consultation and blood test. We arrange your bloods at an accredited laboratory near you, a doctor reviews the results before you meet, and you go through everything together by secure video — what the numbers mean, what is driving your symptoms, and what should happen next. All consultations are with registered medical practitioners.
If you would rather talk to someone first, leave your number below and we will call you back within one working day. There is no obligation to book anything.
Through your GP, or through Quantum: when you book a consultation with blood test, we order the panel and direct you to an accredited laboratory near you. If you want the panel on its own first, it is available from The Health Lab. Either way the sample should be taken in the morning, and the results are reviewed by a doctor before you meet rather than handed to you as a set of numbers to interpret on your own.
Most laboratories quote a total testosterone range of roughly 8–29 nmol/L for adult men, but ranges differ between laboratories and the total is only part of the picture. Free testosterone, SHBG, LH and FSH sit alongside it — and so do your symptoms, which often matter more than where the number lands in the range.
Yes, prescribed by a registered doctor, where your symptoms and your blood results together justify it and other causes have been considered. It is prescription-only and requires ongoing monitoring.
No. You can book directly. With your permission we are glad to write to your GP, and we would encourage it.
Consultations are by secure video, wherever you are in Ireland. Bloods are done in person at an accredited laboratory near you, arranged by us when you book.
Yes. If you are on treatment started elsewhere and want it reviewed and monitored properly, book a consultation and bring whatever records and results you have.
This page is general health information, not individual medical advice, and it is not a recommendation for any particular medicine. Whether any treatment is appropriate for you can only be decided by a doctor who has assessed you. Reviewed by the Quantum medical team, September 2026.
If you're not sure where to start, leave your number. A member of the Quantum team will call you back within one working day, talk you through the options and answer anything you want to ask before you book.