What Blood Tests Should I Get for Muscle Weakness?
The key blood tests for muscle weakness are a comprehensive metabolic panel, TSH, vitamin D, magnesium, and a CBC. Electrolyte imbalances (low potassium, calcium) and thyroid dysfunction are leading treatable causes. Vitamin D and magnesium deficiencies also commonly contribute to muscle weakness.
Possible Causes
Recommended Tests
$72 + $18 order fee · $90 all-in
The 7 tests ordered separately: $76.50 (save $4.50)
Includes 4 of the 6 recommended tests below (not included: RBC Magnesium, Total Cortisol), plus 3 more.
All 6 recommended tests
$79 + one $18 order fee = $97 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
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Content reviewed for accuracy by the JustLabs editorial team.