Blood Tests and Hair Loss
Hair loss and excessive shedding can sometimes be linked to internal factors that are not visible from the outside.
While not every person with hair loss needs blood tests, they can be helpful when assessing certain types of shedding, thinning, or changes in hair quality. Blood test results may provide useful information about nutritional status, thyroid function, inflammation, hormonal influences, or other health-related factors that may contribute to hair and scalp concerns.
At Carmen Du Preez Trichology, blood test results may be reviewed where relevant as part of a broader trichology assessment.
Can Blood Tests Help Explain Hair Loss?
Blood tests can sometimes help identify contributing factors that may be affecting the hair growth cycle.
Hair shedding and thinning may be influenced by several internal factors, including:
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Low iron stores
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Nutritional deficiencies or insufficiencies
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Thyroid imbalance
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Hormonal changes
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Inflammation
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Recent illness
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Rapid weight loss
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Stress on the body
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Medication changes
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General health changes
However, blood tests are only one part of the picture. Hair loss assessment should also consider your hair loss pattern, scalp health, history, symptoms, lifestyle, medication use, stress, diet, hormonal changes, and hair care practices.
Why “Normal” Blood Test Results May Not Tell the Whole Story
Many people are told that their blood tests are normal, yet they are still experiencing hair shedding or thinning.
This can be frustrating and confusing.
A result may sit within a laboratory reference range, but that does not always mean it is ideal for healthy hair growth. Reference ranges are used to identify general health patterns, but hair follicles can be sensitive to changes in nutrient availability, hormonal shifts, illness, inflammation, stress, or other body changes.
This is why it is important not to look at one result in isolation.
For example, iron stores, vitamin D, B12, thyroid markers, and other results may need to be considered alongside your symptoms, history, and hair loss pattern.
What Blood Tests May Be Relevant for Hair Loss?
The blood tests that may be relevant will depend on your individual history and symptoms.
Common tests that may be considered include:
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Full blood count
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Iron studies
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Ferritin
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Vitamin D
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Vitamin B12
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Folate
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Thyroid function tests
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Zinc
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Liver function
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Kidney function
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Inflammatory markers
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Hormonal testing where appropriate
Not every person will need every test. The most appropriate tests depend on the type of hair loss, the pattern of shedding or thinning, your medical history, symptoms, age, medications, menstrual history where relevant, and any recent triggers such as illness, surgery, weight loss, stress, or hormonal changes.
Ferritin, Iron and Hair Shedding
Ferritin is a marker of stored iron.
Iron plays an important role in many body functions, and low iron stores may contribute to increased hair shedding in some people. However, ferritin should not be interpreted on its own. It is best considered alongside iron studies, full blood count, symptoms, medical history, inflammation markers where relevant, and the overall clinical picture.
A ferritin result may be reported as “normal” on a blood test, but this does not always mean it is optimal for hair growth.
This is one reason why a detailed assessment can be helpful.
Thyroid Function and Hair Loss
Thyroid function can influence the hair growth cycle.
Both underactive and overactive thyroid patterns may be associated with hair shedding or changes in hair quality in some people. If thyroid involvement is suspected, thyroid function testing may be useful and should be discussed with a GP or relevant healthcare provider.
A trichology consultation can help identify whether thyroid-related factors may be worth discussing further with your healthcare provider.
Vitamin D, B12, Folate and Other Nutrients
Certain nutrients are important for general health and may play a role in healthy hair growth.
Low or suboptimal levels of vitamin D, B12, folate, zinc, or other nutrients may contribute to shedding or changes in hair quality in some people. However, supplementation should be based on individual need rather than guesswork.
Taking supplements without understanding whether they are needed may not address the real cause of hair loss.
Blood Tests Are Only One Part of Hair Loss Assessment
Blood tests can provide useful information, but they do not diagnose every type of hair loss.
For example, blood tests may not fully explain:
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Some inflammatory scalp conditions
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Hair breakage from cosmetic or mechanical damage
This is why it is important to assess the scalp, hair loss pattern, hair shaft changes, history, and symptoms alongside any blood results.
At Carmen Du Preez Trichology, trichoscopy may also be used to examine the hair and scalp under magnification. This can provide useful information about hair density, hair shaft variation, scalp condition, inflammation, scaling, and other visible features.
Should I Get Blood Tests Before My Appointment?
You do not always need to have blood tests before your first appointment.
If you already have recent blood test results, you are welcome to bring them to your consultation. If further testing appears relevant based on your history and assessment, this can be discussed, and you may be advised to speak with your GP or healthcare provider.
A trichologist does not replace your GP or dermatologist. Where medical testing, diagnosis, prescription treatment, or specialist assessment is required, referral to an appropriate healthcare professional may be recommended.
Why a Trichology Consultation Can Help
Hair loss is rarely one-dimensional.
You may have normal blood results but still experience shedding because of stress, illness, hormones, genetics, scalp inflammation, medication changes, weight loss, or another trigger. You may also have several contributing factors happening at the same time.
A trichology consultation can help bring the pieces together by considering:
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Your hair loss pattern
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Your shedding history
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Your scalp condition
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Your symptoms
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Your lifestyle and nutrition
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Your medical history
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Your medications
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Hormonal changes
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Recent illness, stress, surgery or weight loss
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Relevant blood test results
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Trichoscopy findings
The aim is to better understand what may be contributing to your concern and guide the most appropriate next steps.
Book a Hair Loss Consultation in Perth
If your hair is shedding, thinning, or changing in quality, and you are unsure whether blood test results may be involved, a trichology consultation can help provide clarity.
Carmen Du Preez Trichology offers hair and scalp consultations in Perth, including assessment of hair shedding, thinning hair, scalp concerns, and review of relevant blood test results where appropriate.
Book an initial trichology consultation to take the next step toward understanding your hair and scalp concerns.