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ED treatment option

Testosterone Evaluation and TRT for Erectile Dysfunction

Diagnostic workup and bioidentical hormone replacement when low testosterone is confirmed as a contributing cause. Reviewed and prescribed at Hisential Clinics by an MMC-registered medical team, with structured ongoing monitoring.

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Warm amber sunrise light breaking diagonally across dark textured stone - morning testing window for testosterone evaluation.

Quick answer

Testosterone evaluation is appropriate when ED is accompanied by reduced libido, fatigue, mood changes or loss of muscle mass. The standard workup is two morning total-testosterone samples (testosterone peaks in the morning), supplemented by free testosterone, SHBG, LH and prolactin where indicated. Clinical hypogonadism is generally diagnosed when total testosterone is below 12 nmol/L on two confirmatory tests with matching symptoms. Where confirmed, testosterone replacement therapy (TRT) - topical gel, intramuscular injection or implant - is offered with structured ongoing monitoring.

Medically reviewed by Dr. Azzim Emir, MBChB, Cert. Andrology (SMHS)

Last reviewed 1 May 2026 · Next review 1 November 2026

When to consider a testosterone workup

Testosterone testing is not a routine first-line investigation for isolated ED. It is a high-yield investigation when the clinical picture suggests hormonal involvement: reduced libido, persistent fatigue, mood change, loss of morning erections, reduced muscle mass and central weight gain - especially in men over 40.

Conditions that predispose to hypogonadism include type 2 diabetes, obesity, obstructive sleep apnoea, chronic opioid use, prior chemotherapy and pituitary disorders. These are screened for as part of the consultation.

How the diagnostic workup is done

Total testosterone is measured on two separate morning blood samples, ideally between 7:00 and 11:00, because levels peak early and fall through the day. Where total testosterone is borderline, free testosterone (calculated from SHBG), LH and prolactin are added to distinguish primary testicular failure, secondary (pituitary/hypothalamic) failure and conditions like hyperprolactinaemia.

Clinical hypogonadism is generally diagnosed when total testosterone is below 12 nmol/L on two confirmatory tests, accompanied by consistent symptoms.

Treatment options when hypogonadism is confirmed

Where hypogonadism is confirmed, options include:

  • Topical testosterone gel - daily application, steady levels, easy to titrate.
  • Intramuscular injection - typically every 10-14 weeks (long-acting undecanoate) or shorter-acting esters.
  • Subcutaneous testosterone implants - longer dosing intervals, requires a minor in-clinic procedure.

Choice depends on patient preference, medical history, fertility plans and convenience. Your personal health concierge coordinates the regimen and follow-up.

Monitoring and safety

TRT requires structured ongoing monitoring - it is not a fit-and-forget prescription. Testosterone levels, haematocrit (red cell concentration), PSA, lipids and clinical response are reviewed at 3 months, 6 months and then annually.

TRT is contraindicated in untreated prostate or breast cancer and in men actively trying to conceive (it suppresses spermatogenesis). It is used with caution in severe cardiovascular disease, untreated sleep apnoea, and erythrocytosis.

Frequently asked questions

FAQ

Frequently asked questions

Clear answers, written by our clinical team. Tap any question for its direct permalink, or reach out to your Personal Concierge for anything else.

  1. Will TRT cure my ED?

    TRT improves ED only when low testosterone is genuinely a contributing cause. In men with confirmed hypogonadism, TRT can restore libido and improve erectile response, often in combination with PDE5 inhibitors. In men with normal testosterone, TRT will not improve ED.

  2. How long until TRT works?

    Effects on libido and mood typically emerge over 4-6 weeks. Effects on erectile function, body composition and muscle mass develop over 12 weeks to 6 months.

  3. Does TRT affect fertility?

    Yes. Exogenous testosterone suppresses the body's own production of sperm. Men actively trying to conceive should defer TRT or discuss alternatives with the treating clinician.

  4. Is TRT lifelong?

    When hypogonadism is structural (e.g. primary testicular failure), TRT is usually long-term. When it is secondary to a reversible cause (e.g. opioid use, severe obesity, sleep apnoea), correcting the underlying cause sometimes allows TRT to be withdrawn.

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