TRT in the UK: NHS and private pathways, and what gets monitored

How testosterone deficiency is confirmed in the UK

UK practice treats a diagnosis as symptoms plus repeated biochemistry, never a single number from a home kit.

• British Society for Sexual Medicine guidance asks for symptoms consistent with deficiency plus at least two morning fasting total testosterone measurements taken on separate days.
• Where total testosterone is borderline, free testosterone, sex hormone binding globulin and albumin are used to interpret it.
• Luteinising hormone, follicle stimulating hormone and prolactin are usually checked to separate testicular from pituitary causes.
• Reversible causes — obstructive sleep apnoea, opioid use, poorly controlled diabetes, thyroid disease — are addressed before hormone treatment is considered.

NHS and private pathways

Both routes exist, and they differ in gatekeeping rather than in the medicines used.

• On the NHS, the usual path is GP assessment and blood tests, then referral to endocrinology or urology where the picture is unclear or the patient is younger.
• Waiting times vary substantially by area, which is why many people use private men's-health clinics.
• A private clinic must still use UK-registered prescribers and a registered pharmacy; the prescription itself is no less valid than an NHS one.
• Testosterone is a prescription-only medicine and a controlled drug in the UK, so buying it without a prescription is outside the legal supply chain regardless of where the website is based.
• Ask a private clinic what monitoring is included and what it costs — ongoing bloods, not the first prescription, are where the long-term cost sits.

Products licensed in the UK

UK-licensed testosterone comes as gels, creams and injections, and the choice affects how stable levels are and what monitoring looks like.

• Transdermal gels and creams are applied daily and produce relatively steady levels; transfer to other people by skin contact is the specific warning on those labels.
• Short-acting intramuscular esters are given every few weeks and produce a peak and trough pattern between injections.
• Long-acting testosterone undecanoate injections are given at much longer intervals after a loading interval.
• Each product has its own UK summary of product characteristics on the electronic Medicines Compendium, including the timing at which blood levels should be sampled — that timing differs by product, which is why results are easy to misread.

What gets monitored, and what to record

Monitoring is the part people underestimate, and it is the part that makes treatment safe over years rather than months.

• Hematocrit and full blood count are checked because testosterone raises red cell mass; UK guidance sets thresholds at which treatment is paused or reviewed.
• Prostate-specific antigen and a prostate assessment are performed before starting in the relevant age groups and repeated during treatment.
• Testosterone levels are re-checked at intervals set by the product and the clinic, alongside symptom review.
• Fertility matters: exogenous testosterone suppresses sperm production, so anyone who may want children should raise it before starting.
• Record every application or injection with the date, the product, the site and how you felt. Clinics run on intervals, and a missed or doubled dose weeks earlier is the usual explanation for an odd blood result.

References

• British Society for Sexual Medicine — guidelines on adult testosterone deficiency
• electronic Medicines Compendium (emc) — UK testosterone product information
• BNF — testosterone preparations
• NICE Clinical Knowledge Summaries — erectile dysfunction and hypogonadism