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Tests & diagnostics

Hair loss workup

The medical work-up for male hair loss - distinguishing pattern baldness from the conditions that need blood tests and treatment.

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At a glance

  • Preparation

    Bring photographs showing the timeline of loss, a list of medications and supplements, and note any scalp symptoms such as itch or scaling.

  • What happens during the test

    Assessment combines history, examination of the scalp and hair pull test, dermoscopy of the follicles, and blood tests - ferritin, thyroid function, vitamin D - where the pattern is diffuse or atypical.

  • Results timeline

    Bloods return within days; the diagnosis is usually made clinically at the first consultation.

  • Specialist follow-up

    A dermatologist or hair specialist confirms the type of loss and matches treatment to it, from finasteride and minoxidil for pattern loss to specific therapy for inflammatory causes.

What this test is and when it is recommended

Most male hair loss is androgenetic - pattern baldness - which is a diagnosis, not a disease, with well-evidenced treatments for men who want them. The work-up exists to catch the exceptions: diffuse shedding from iron deficiency, thyroid disease or medication effects; patchy loss from alopecia areata; and scarring alopecias, where inflammation permanently destroys follicles and early treatment protects what remains. Sudden, patchy or inflamed hair loss warrants proper assessment rather than an online prescription.

How to access it

A hair loss work-up can be reached through your GP or booked directly with a private dermatologist or dedicated hair clinic. NHS waiting lists for diagnostics are often long, while private appointments are typically available within days to around two weeks. Costs vary by provider.

Frequently asked

Common questions about Hair loss workup.

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

  • What is a hair loss workup?

    A hair loss workup is a set of assessments, usually combining an examination with blood tests, used to identify why someone is losing hair and to distinguish common patterns like male or female pattern hair loss from other treatable causes. It looks at hormones, iron stores, thyroid function and general health markers that can affect hair growth.

  • Why would a doctor order this workup?

    It's used when hair thinning or shedding is noticeable, sudden, patchy, or accompanied by other symptoms, to check for causes such as iron deficiency, thyroid problems, hormonal imbalance (including PCOS in women), certain autoimmune conditions, or nutritional deficiencies. It helps guide whether treatment beyond general hair care is likely to help.

  • Do I need to prepare for this workup?

    Blood tests are often best done fasting, particularly if hormone levels are being checked, so morning appointments are common; your clinic will advise. Let your doctor know about recent illness, weight change, or new medications, as these can all affect hair growth.

  • What happens during the workup?

    Your doctor will examine your scalp and hair pattern, take a detailed history, and arrange blood tests that commonly include full blood count, ferritin, thyroid function, and sometimes hormone levels. Occasionally, a scalp biopsy or dermatology referral is suggested if the pattern is unusual.

  • Does the workup hurt or carry any risks?

    The examination is non-invasive, and blood tests involve just a brief needle prick with minimal risk. A scalp biopsy, if needed, is a minor procedure done under local anaesthetic.

  • How long do results take?

    Most blood test results are available within a few days, though some hormone tests can take slightly longer. Your doctor will discuss the full picture with you once everything is back.

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

    Findings like low iron stores or an underactive thyroid are common, treatable causes of hair shedding, and addressing them often improves hair growth over several months. If blood tests are normal, the pattern may reflect genetic hair loss, for which your doctor can discuss evidence-based treatment options, or it may be worth pursuing a dermatology opinion.

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

    Basic blood tests are available on the NHS via your GP, though hair loss itself is not always prioritised for extensive NHS investigation unless there's an underlying medical concern. Private workups are typically available within days, with results reviewed by a specialist; cost varies by provider.

  • Is a hair loss workup accurate and reliable?

    Blood tests reliably identify common contributing factors like iron deficiency and thyroid disease, giving a clear, evidence-based starting point. Genetic pattern hair loss itself is usually a clinical diagnosis based on the pattern of thinning rather than a specific test.

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

    You can book a private GP or dermatology consultation directly, with blood tests often arranged the same day.