What Blood Tests Should I Get for Cold Intolerance?

The key blood tests for cold intolerance are TSH and Free T4, CBC, ferritin, and a comprehensive metabolic panel. Hypothyroidism is the most common cause of always feeling cold. Anemia and iron deficiency also reduce oxygen delivery and heat production.

Possible Causes

HypothyroidismAnemiaIron Deficiency

Recommended Tests

TSH

$8

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

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Free T4

$8

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

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Free T3

$10

Measures the active thyroid hormone T3. Important for evaluating thyroid function, especially in hyperthyroidism.

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CBC w/ Diff

$5

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

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Ferritin

$9

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

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CMP

$10

Measures 14 substances including glucose, electrolytes, kidney and liver function markers.

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When to See a Doctor

If your cold intolerance 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

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Related Articles

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How to get TSH, Free T4, and Free T3 tested affordably without insurance coverage.

Free T3 Blood Test: What It Measures and How to Order

Why Free T3 matters for thyroid health and when to add it to your panel.

Free T4 Blood Test: What It Measures and How to Order

How Free T4 complements TSH for a complete picture of thyroid hormone production.

Content reviewed for accuracy by the JustLabs editorial team.