What Blood Tests Should I Get for Brain Fog?
The top blood tests for brain fog are TSH, vitamin B12, ferritin, fasting glucose, and a comprehensive metabolic panel. Thyroid dysfunction is a leading cause of mental cloudiness. These tests also identify B12 deficiency, iron deficiency, and blood sugar issues that impair cognition.
Possible Causes
Recommended Tests
$72 + $18 order fee · $90 all-in
The 7 tests ordered separately: $76.50 (save $4.50)
Includes 6 of the 7 recommended tests below (not included: Fasting Glucose), plus 1 more.
B12
$8
Measures B12 levels essential for nerve function, DNA synthesis, and red blood cell formation.
All 7 recommended tests
$76.50 + one $18 order fee = $94.50 all-in
When to See a Doctor
Seek immediate medical attention if your symptoms are severe, rapidly worsening, or accompanied by warning signs (chest pain, shortness of breath, high fever). Blood tests are a valuable first step, but they don't replace evaluation by a healthcare professional.
Frequently Asked Questions
Related Symptoms
Related Articles
Which thyroid tests you actually need to monitor Hashimoto's and track antibody levels.
How to get TSH, Free T4, and Free T3 tested affordably without insurance coverage.
The essential blood tests to identify thyroid, iron, and vitamin causes of tiredness.
Content reviewed for accuracy by the JustLabs editorial team.