What Blood Tests Should I Get for Hair Loss?

The most important blood tests for hair loss are TSH, thyroid antibodies, ferritin, CBC, vitamin D, testosterone, and DHEA-S. Low ferritin is the leading reversible cause in women, and thyroid dysfunction is a close second. These tests identify the most treatable causes of hair thinning.

Possible Causes

HypothyroidismHashimoto's ThyroiditisIron DeficiencyPCOS (Polycystic Ovary Syndrome)Anemia

Recommended Tests

Recommended panel9 tests · 26 biomarkers
Hair Loss Panel

$116 + $18 order fee · $134 all-in

The 9 tests ordered separately: $124 (save $8)

Add Panel to Cart

Includes 7 of the 8 recommended tests below (not included: TPO Ab), plus 2 more.

TSH

$9

Measures thyroid-stimulating hormone to evaluate thyroid function. TSH is the most sensitive marker for detecting thyroi...

Order Test

Free T4

$9

Measures the unbound, active form of the thyroid hormone T4. Helps assess thyroid function and diagnose thyroid conditio...

Order Test

TPO Ab

$13.50

Detects antibodies against thyroid peroxidase enzyme. Elevated levels suggest autoimmune thyroid disease like Hashimoto'...

Order Test

Ferritin

$10

Measures iron storage protein. Best indicator of total body iron stores.

Order Test

Vitamin D

$25

Measures vitamin D status. Deficiency is common and linked to bone health, immune function, and mood.

Order Test

CBC w/ Diff

$6

Comprehensive blood cell analysis including red cells, white cells, platelets, and white cell differential.

Order Test

Testosterone

$34

Comprehensive testosterone panel measuring both free and total testosterone levels.

Order Test

DHEA-S

$14

Measures DHEA-S, a precursor hormone from the adrenal glands. Declines with age.

Order Test

All 8 recommended tests

$120.50 + one $18 order fee = $138.50 all-in

Add All 8 to Cart

When to See a Doctor

If your hair loss is severe, rapidly worsening, or accompanied by alarming symptoms (chest pain, shortness of breath, high fever), seek immediate medical attention. Blood tests are a valuable first step, but they don't replace evaluation by a healthcare professional.

Frequently Asked Questions

Related Symptoms

FatigueDry SkinBrittle NailsCold Intolerance

Related Articles

The Hashimoto's Lab Panel: What to Order and Why

Which thyroid tests you actually need to monitor Hashimoto's and track antibody levels.

What Does Thyroid Show on a Blood Test?

A breakdown of every thyroid marker and what each one tells you about your health.

Iron Binding Capacity Blood Test Explained

How TIBC and transferrin saturation help diagnose iron deficiency and overload.

Content reviewed for accuracy by the JustLabs editorial team.