Laboratory Tests

Laboratory Tests — Understanding the Role of Blood Work in Hair Loss Diagnosis

Blood tests are sometimes necessary when diagnosing hair loss, especially when the cause is not immediately clear from clinical examination alone. Because the hair follicle is influenced by hormones, nutrition, immune function and metabolic health, identifying internal imbalances helps the doctor pinpoint why shedding or thinning is occurring. In certain cases, such as before a hair transplant, specific tests are also required to ensure patient safety and rule out infectious diseases.

When hair loss does not follow a typical genetic pattern, when symptoms appear suddenly or when treatment response is poor, laboratory investigations provide essential information that guides accurate diagnosis and tailored treatment planning.

Why Blood Tests Are Required

Blood tests may be recommended for several important reasons:

  • To identify underlying medical conditions — hormonal disorders (thyroid imbalance), autoimmune conditions, iron deficiency, vitamin deficiencies or chronic inflammatory states can contribute to hair thinning. Blood tests help detect these issues early so they can be corrected.
  • To assess nutritional status — low levels of iron, ferritin, vitamin B12, folate, zinc or vitamin D can weaken the hair growth cycle. Testing ensures deficiencies are not missed.
  • To rule out metabolic or systemic disorders — conditions such as anaemia, uncontrolled diabetes or immune-related illnesses can affect the hair follicle. Blood tests help distinguish these from genetic hair loss.
  • To ensure treatment safety — before procedures like FUE hair transplantation, screening for infectious diseases such as HIV or hepatitis is essential for the safety of both the patient and the medical team.
  • To refine the diagnosis when clinical findings are unclear — in cases where symptoms do not fit a typical pattern, or when shedding is rapid and diffuse, blood tests help differentiate telogen effluvium, autoimmune alopecia, hormonal imbalance or nutritional hair loss.

Scroll to see different causes
of Laboratory Tests

486805-200

FAQs

The hair follicle is an incredibly complicated organ. Multiple medical conditions and nutritional or metabolic abnormalities can cause hair loss. Apart from thorough clinical history taking and examination, sometimes, blood tests are prescribed to rule out other hair loss causes.

This is usually the case when there is no clear genetic history, no obvious dietary disturbances or when conventional medical treatment has failed to give rise to a sufficient effect.

  • Full blood count
  • Erythrocyte sedimentary rate (ESR)
  • Ferritin
  • Zinc / Copper ratio
  • Anti-nuclear antibodies (ANA)
  • Rheumatoid factor (RhF)
  • Thyroid function tests
  • Vitamin D assay
  • Vitamins B12 and folate

There has been no correlation found between blood levels of DHT and cortisol and hair loss. In fact, the levels of these 2 hormones vary across the day e.g. cortisol levels are highest in the early morning and get lower throughout the day.

Circulating DHT will also not affect hair follicles that are not genetically ‘programmed’ to be DHT susceptible, for example those at the back of the head (the donor area). Hence, in such scenarios, a clinical examination would be a sufficient test to diagnose male or female pattern hair loss / androgenetic alopecia.

Male hormone Testing – DHEAS, Testosterone, Sex hormone binding globulin

Female hormone Testing – Estradiol, Prolactin, Progrestrone, FSH, LH

If you are planned for a hair transplant procedure, additional tests may include:

  • Hepatitis B and C
  • HIV

This is to establish any blood borne transmissible illness for additional surgical precautions.