Health guide
Hair fall: why a blood test often reveals the real cause
Hair fall that goes beyond normal daily shedding is frequently driven by an underlying imbalance rather than genetics alone. Thyroid dysfunction, iron deficiency, low vitamin D, and vitamin B12 deficiency are among the most common and most overlooked causes. Each is detectable with a simple blood test and, once identified, is treatable. Understanding the cause is the first step toward stopping the loss.
Reviewed by Dr. Vishal Singh, Lab Director
When hair fall is worth testing
- Sudden or excessive shedding beyond normal daily hair loss
- Visible thinning at the crown, temples, or along the parting
- Hair fall accompanied by fatigue, brain fog, or feeling cold
- Brittle nails or dry skin appearing alongside hair loss
- Hair loss following a recent illness, surgery, or diet change
- Family history of thyroid disease or a known iron-poor diet
What each test is looking for
A TSH test checks thyroid function, since both an underactive and overactive thyroid can trigger diffuse shedding across the scalp. Iron studies measure your stored and circulating iron, as low ferritin is one of the most common reversible causes of hair thinning in women. Vitamin D and vitamin B12 matter because deficiencies in both are very common in northern India and are linked to disrupted hair-growth cycles. A complete blood count adds a broad picture of nutritional status and can flag anaemia that may be amplifying the loss.
When to test and what to expect
Testing is worthwhile if hair fall has persisted more than four to six weeks, is visibly progressing, or comes with any systemic symptom such as fatigue or weight change. All five tests need only a single blood draw, with no fasting unless your doctor advises otherwise. LabONE offers free home sample collection across Dehradun, so there is no need to visit a centre. Results are typically available within 24 hours, with a digital report you can share with your physician for next steps.
This guide is for general information and is not a diagnosis. Always discuss your symptoms and results with a doctor. LabONE includes a free doctor consultation with every report.
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Frequently asked questions
Can a blood test really explain why my hair is falling?
Yes, in many cases. Thyroid disorders, iron deficiency, and vitamin D or B12 deficiency are among the most frequent internal causes of hair fall and each shows up clearly in routine blood work. A normal result is also valuable, as it narrows the cause to factors your dermatologist can then assess.
Is hair fall from nutritional deficiency common in the hills region?
More common than most people realise. Diets low in red meat or dairy, limited winter sun, and changing food habits have made iron, vitamin D, and B12 deficiencies widespread in Uttarakhand. Testing first is the most reliable way to know whether supplementation is appropriate for you.
Not sure where to start?
Message LabONE on WhatsApp. We will help you pick the right test, book home collection in Dehradun, and your Green Card is free with any ₹999 booking.
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