Skip to main content

Tests & diagnostics

Gynaecomastia workup

The work-up for male breast enlargement - true gynaecomastia versus fat, the hormone and drug causes, and when tissue needs scanning.

Published Next review

At a glance

  • Preparation

    Bring a complete list of medications, supplements and any anabolic steroid or cannabis use - drug causes are among the most common and most fixable.

  • What happens during the test

    Assessment includes examination to distinguish glandular tissue from fat, morning blood tests - testosterone, LH, oestradiol, prolactin, hCG, liver and kidney function - and ultrasound where the tissue is asymmetric or unusual.

  • Results timeline

    Blood results return within days, and most work-ups conclude within two weeks.

  • Specialist follow-up

    An endocrinologist addresses any hormonal or drug cause found; long-standing stable gynaecomastia that bothers the patient is discussed with a surgeon.

What this test is and when it is recommended

True gynaecomastia is enlargement of glandular breast tissue driven by the balance between oestrogen and testosterone, and it is common - at puberty, with ageing, with weight gain, and as a side effect of numerous drugs from spironolactone to anabolic steroids. The work-up has two jobs: identify the treatable causes, and exclude the rare but important ones, including testicular tumours that secrete hormones and, uncommonly, male breast cancer - which is why a firm, one-sided lump in an older man is always imaged.

How to access it

Assessment can begin with your GP or a directly booked private endocrinology or breast clinic appointment. Where NHS diagnostic waits are frequently lengthy, private slots are usually offered within days to roughly two weeks. Pricing varies by provider.

Frequently asked

Common questions about Gynaecomastia workup.

Quick, plain-English answers to what people ask us most.

  • What is a gynaecomastia workup?

    A gynaecomastia workup is a set of assessments used to investigate enlarged breast tissue in men, aiming to distinguish it from normal fat and to look for an underlying hormonal, medication-related or, rarely, medical cause. It usually combines a clinical examination with blood tests and sometimes imaging.

  • Why would a doctor order this workup?

    It's used when a man notices breast enlargement or tenderness, to check for hormone imbalances (such as raised oestrogen or low testosterone), liver or kidney problems, thyroid issues, or medication side effects that can all contribute. It also helps rule out rarer causes, including testicular or other tumours.

  • Do I need to prepare for this workup?

    Blood tests are often best done in the morning and may require fasting; your doctor will advise on this and on whether to pause any relevant medications or supplements beforehand. Bring a list of current medications, as many common drugs can cause this condition.

  • What happens during the workup?

    Your doctor will examine the breast tissue and testes, take a detailed history, then arrange blood tests covering hormones such as testosterone, oestrogen, LH, prolactin and thyroid function, plus liver and kidney checks. A breast ultrasound or mammogram may be added if the examination suggests it.

  • Does the workup hurt or carry any risks?

    The blood tests involve a brief needle prick, and imaging such as ultrasound is painless; a mammogram involves brief compression but is well tolerated. Overall risk from the assessment itself is very low.

  • How long do results take?

    Routine blood tests are often back within a few days, though some hormone assays can take a little longer. Imaging results are typically available within a similar timeframe, and your doctor will bring everything together at a follow-up.

  • What do abnormal results mean, and what happens next?

    Most gynaecomastia in men relates to normal hormonal changes, weight, or medication effects rather than anything serious, and many cases settle or are managed simply once the cause is identified. Occasionally, further imaging, a specialist endocrinology or urology referral, or treatment adjustment is recommended, which your doctor will discuss with you.

  • How much does a private gynaecomastia workup cost, and is it available on the NHS?

    This assessment is available on the NHS via a GP, though non-urgent referrals can take time. Private workups are typically available within days, with results reviewed by a specialist; cost varies by provider.

  • Is a gynaecomastia workup accurate and reliable?

    Combining examination, hormone blood tests and imaging gives a reliable picture in the great majority of cases and identifies a clear cause or reassuring explanation for most men. Occasionally further specialist review is needed where the picture isn't straightforward.

  • How do I book a gynaecomastia workup privately, and how quickly can I be seen?

    You can book a private GP or endocrinology consultation directly, with blood tests and imaging often arranged within the same week.