Hair loss tests that reveal the cause and determine the treatment

Are you experiencing noticeable hair loss? Have you started seeing bald patches on your scalp or a sudden decline in hair thickness? You’re not alone.Hair loss is one of the most common complaints among both men and women. But effective treatment always begins with the right diagnosis — and that starts with the proper tests and lab investigations to uncover the real cause behind the problem.In this article from Dalili Medical, we offer a complete guide to the most important hair loss tests that your doctor may recommend, and how these tests can help determine the most appropriate treatment plan for your condition.

✅ When Should You Consider Hair Loss Tests?

Not all hair loss requires lab testing. However, tests are recommended in the following situations:

• Sudden or excessive hair shedding

• Noticeable bald patches or thinning on the scalp

• Hair loss accompanied by symptoms like fatigue or irregular periods

• No improvement despite using oils or supplements

• Family history of genetic baldness or autoimmune diseases

 Key Lab Tests for Hair Loss

1. Iron Studies (Ferritin – Serum Iron – TIBC)

One of the most common causes of hair loss, especially in women.

• Ferritin reflects your body’s iron stores.

• Levels below 30 ng/mL can lead to significant hair shedding.

• Serum Iron and TIBC assess iron absorption and transport.

2. Thyroid Function Tests (TSH – T3 – T4)

Thyroid hormone imbalances affect hair strength and growth.

• Hypothyroidism slows down hair growth and causes dryness.

• Hyperthyroidism weakens the hair shaft and leads to root shedding.

• These tests help detect any hormonal imbalances related to the thyroid gland.

3. Complete Blood Count (CBC – Hemoglobin)

Anemia or low red blood cell levels reduce oxygen supply to hair follicles.

• CBC provides a full picture of blood health.

• Low hemoglobin or iron is a leading cause of chronic hair thinning.

4. Vitamin D Test

Vitamin D plays a critical role in hair follicle stimulation.

• Deficiency is associated with hair weakness and patchy loss.

• Optimal levels should be above 30 ng/mL.

5. Zinc Test (Serum Zinc)

Zinc is essential for healthy hair production and scalp health.

• Zinc deficiency can lead to brittle hair and increased shedding.

• Normal range: 70–120 mcg/dL

6. Vitamin B12 and Folic Acid Tests

These vitamins are crucial for cell regeneration and scalp nourishment.

• B12 supports red blood cell production and nerve health.

• Folic acid helps deliver nutrients to the scalp.

7. Female Hormone Panel (LH – FSH – Estradiol)

Especially useful in women with hair loss and menstrual irregularities.

• May reveal conditions like PCOS or other hormonal imbalances.

• Proper LH/FSH ratio is vital for healthy skin and hair.

8. Male Hormones and Androgens (Testosterone – DHEA – Androstenedione)

Useful in diagnosing androgenic alopecia (male-pattern baldness).

• High androgen levels, especially DHT (a byproduct of testosterone), are linked to frontal hairline recession in both men and women.

9. ANA Test and Autoimmune Screening

In rare cases, autoimmune diseases like alopecia areata or lupus cause hair loss.

• The ANA (antinuclear antibody) test detects immune system activity that might attack hair follicles.

• Recommended if hair loss is sudden, patchy, or resistant to treatment.

 Other Helpful Examinations

 Scalp Examination

• Detects dandruff, inflammation, or blocked follicles.

• Helps rule out seborrheic dermatitis or fungal infections.

 Hair Pull Test

• A gentle pull of 20–30 hairs to assess hair strength and root stability.

• Useful for identifying telogen effluvium or alopecia areata.

 Tips Before Testing

• Some tests (e.g., iron studies) should be done in the morning on an empty stomach.

• Inform your doctor of any supplements or medications you're taking.

• Don’t self-diagnose based on lab results—consult a qualified physician or dermatologist for interpretation.

❓ When Are Hair Loss Tests Absolutely Necessary?

• If hair loss lasts for more than 3 months

• If you have other symptoms: fatigue, dizziness, weight gain, or missed periods

• If hair loss appears in patches or streaks

• If you have a family history of early baldness or autoimmune conditions

✅ Summary

Hair loss blood tests are the first step toward proper treatment. Without identifying the cause—be it iron deficiency, thyroid issues, hormonal imbalance, or autoimmunity—you may end up wasting time and money on temporary solutions.If your hair loss is persistent or worsening, consult a dermatologist or internal medicine doctor and request these tests. They are a valuable investment in both your hair health and self-confidence.