Test Guide
Hair Loss and Thinning: What Biomarker Testing Can Reveal
Hair shedding has many causes. Genetics are the largest single factor, but biomarker patterns can contribute, especially in women experiencing diffuse hair thinning. Biomarker testing can highlight underlying factors that may contribute to how you feel. It is not a diagnostic tool. The information below is educational and does not replace personalised medical advice.
Biomarker patterns often linked with hair changes
Low ferritin: The strongest biomarker association with diffuse hair shedding (telogen effluvium) in women. Many dermatology pathways look at ferritin first.
Thyroid dysfunction: Both underactive and overactive thyroid can cause hair changes, often diffuse rather than patchy.
Low vitamin D: Some studies link low vitamin D with hair shedding, though evidence is mixed.
Hormonal shifts: Postpartum, perimenopause and PCOS can all produce hair changes. SHBG, testosterone and DHEA patterns can help build context.
Low zinc or biotin: Rare on a normal diet but worth noting.
Recent significant illness or surgery: Can cause telogen effluvium 2 to 4 months after the event.
Patterns that need a dermatologist, not a blood test
Patchy hair loss (alopecia areata), scarring patches, sudden hair loss in defined areas, or scalp redness and itching all need clinical assessment. A blood test is not the right starting point.
Male and female pattern hair loss (androgenetic alopecia) is primarily genetic. Treatment options exist and a dermatologist or trichologist is the right port of call.
Chxhealth panels that cover these markers
The panels below cover the biomarkers discussed above. Each comes with a plain English PDF report, lab analysis by Randox (UKAS, ISO 15189), and the phlebotomy fee included in the price.
Tired All The Time
Covers iron, thyroid, B12, vitamin D and inflammation in one panel.
Iron Status
Focused iron panel including ferritin.
Thyroid Health
When thyroid is the suspected contributor.
Hormonal Health
For postpartum, perimenopausal or hormonally driven hair changes.
Related biomarker guides
Read more about the markers discussed in this guide:
FAQs
What blood test should I do first for hair loss?
Ferritin and thyroid markers are usually the highest yield for diffuse shedding. A broader panel adds context.
How long does hair grow back after a deficiency is corrected?
Hair takes time. Visible regrowth typically begins 3 to 6 months after the underlying issue is addressed.
Is hair loss always reversible?
Diffuse shedding from a temporary trigger usually is. Pattern hair loss is largely genetic and not biomarker-driven. A dermatologist can advise on options.
When should I see a dermatologist?
If hair loss is patchy, sudden, accompanied by scalp issues, or if blood tests do not explain it.
About this guide. These tests provide biomarker data only. They do not diagnose any condition. Always discuss your results with a qualified clinician before making decisions about your health, medication or lifestyle. Educational content for general awareness. Chxhealth provides biomarker and genetic data. We do not diagnose, treat or prescribe. For medical advice about your health or results, please speak to a qualified clinician.