Why test for hair loss?
Hair loss (alopecia) can be triggered by iron deficiency, thyroid disorders, hormonal changes, vitamin deficiencies, and stress. In many cases, identifying and treating the underlying cause can slow or reverse hair loss. Blood tests are typically the first step in investigating unexplained hair thinning.
Recommended tests
Iron profile
Compare pricesFerritin levels below 70 µg/L are associated with hair shedding even without full anaemia
Thyroid function
Compare pricesBoth overactive and underactive thyroid can cause diffuse hair thinning
Hormone profile
Compare pricesElevated androgens or hormonal shifts (e.g. PCOS, menopause) are common causes
Vitamin D test
Compare pricesVitamin D deficiency is linked to hair thinning and slow regrowth
Vitamin B12 test
Compare pricesB12 deficiency independently contributes to hair shedding and fatigue
When to see your GP
If you notice sudden patchy hair loss, complete loss of eyebrows/eyelashes, or scarring on the scalp, see your GP for specialist referral.
Why test for hair loss?
Symptom-led matching
See the tests commonly used to investigate this symptom
UKAS accredited labs
Every listed provider uses UKAS-accredited UK laboratories
Clear turnaround
Typical result times shown alongside price and biomarker coverage
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