Hereditary hair loss in men is linked to DHT, a powerful form of testosterone. Sensitive hair follicles on your head respond to DHT by gradually making thinner hair. So it isn't about "too much" testosterone, but about how sensitive your follicles are.
I hear that misunderstanding a lot: men think baldness means they have lots of testosterone. It isn't that simple.
How does DHT cause hair loss?
DHT is made from testosterone by an enzyme. With hereditary sensitivity, hair follicles shorten their growth cycle under DHT, so the hair gets finer and eventually stays away. The pattern, often a receding hairline and the crown, is typical of this form.
Can you see hair loss in your blood?
Not directly. Hereditary hair loss is mostly identified by the pattern, not by a number. A blood test can map your testosterone and DHT, and help rule out other causes of hair loss, such as a thyroid problem or a shortage.
Sudden or patchy hair loss doesn't fit the hereditary pattern and is a reason to see your GP.
What can you do with it?
Discuss persistent or rapid hair loss with your GP or a dermatologist. See also gynecomastia and high oestrogen in men, and the pillar male hormonal health.
Getting started
The Testosterone Panel maps your testosterone; the Men's Hormones panel looks more broadly, handy for ruling out other causes.
References
- Dutch Society for Dermatology and Venereology (NVDV). Androgenetic alopecia: background and biology.
- Wu FCW, et al. Identification of late-onset hypogonadism in middle-aged and elderly men. N Engl J Med. 2010;363(2):123-135. doi:10.1056/NEJMoa0911101.
- NHG-Standaard Thyroid disorders (hair loss as a symptom). Dutch College of General Practitioners.
Disclaimer
Caliberhealth works with BIG-registered doctors who assess your blood results. This article gives general information and is not a substitute for medical advice from a GP or specialist. A blood test is a tool, not a diagnosis in itself. For serious symptoms, contact your GP, or in an emergency call 112.
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