What Blood Tests Should I Get for Insomnia?

The top blood tests for insomnia are TSH, cortisol, ferritin, magnesium, and vitamin D. Thyroid dysfunction disrupts sleep cycles, elevated cortisol prevents sleep onset, and low iron causes restless legs. These tests identify the most common medical causes of persistent insomnia.

Possible Causes

HypothyroidismHyperthyroidismAdrenal FatigueIron 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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Total Cortisol

$13

Measures total cortisol levels to assess adrenal function and stress response.

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Ferritin

$9

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

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RBC Magnesium

$15

Measures magnesium inside red blood cells. More accurate than serum magnesium for assessing true status.

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Vitamin D

$22

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

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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 insomnia 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

AnxietyFatigueNight SweatsMood Swings

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Content reviewed for accuracy by the JustLabs editorial team.