Iodine
Iodine is an essential trace element required for synthesizing thyroid hormones T3 and T4. Deficiency causes hypothyroidism, goiter, and, in pregnancy, impaired fetal brain development, and is still common globally. Excess iodine from supplements or medications such as amiodarone can trigger either hypothyroidism or hyperthyroidism and, in some people, autoimmune thyroiditis.
1 providers include this
Thyroid Function
52-109 μg/L, WHO optimal:100-199 μg/L
What is Iodine?
Iodine is an essential trace element required for synthesizing thyroid hormones T3 and T4. Deficiency causes hypothyroidism, goiter, and, in pregnancy, impaired fetal brain development, and is still common globally. Excess iodine from supplements or medications such as amiodarone can trigger either hypothyroidism or hyperthyroidism and, in some people, autoimmune thyroiditis.
Why It Matters
Required for thyroid hormone synthesis. Deficiency causes hypothyroidism and goiter. Excess can trigger autoimmune thyroid disease.
Which Providers Test Iodine?
Full Provider Comparison
| Provider | Includes | Annual Cost | Biomarkers |
|---|---|---|---|
 Superpower | — | $199 | 100+ (150 with ratios) |
 WHOOP Advanced Labs | — | $349 | 65 |
 Labcorp OnDemand | — | $398 | 40+ |
| — | $486 | 40+ | |
| — | $449 | 288 | |
| — | $349 | 100+ | |
| — | $829 | 54 | |
 Function Health | ✓ | $365 | 160+ |
| — | $250 | 65 | |
| — | $495 | 80+ | |
| — | $895 | 100+ | |
| — | $1950 | 130+ | |
| — | $375 | 95+ | |
| — | $Varies | 75+ | |
| — | $190 | 100+ | |
| — | $99 | 50 | |
| — | $124 | 60 | |
| — | $349 | 130+ | |
| — | $349 | 80+ | |
| — | $375 | 85 | |
| — | $700 | 128 | |
| — | $99 | 100+ |
Frequently Asked Questions
What is Iodine?
Iodine is an essential trace element required for synthesizing thyroid hormones T3 and T4. Deficiency causes hypothyroidism, goiter, and, in pregnancy, impaired fetal brain development, and is still common globally. Excess iodine from supplements or medications such as amiodarone can trigger either hypothyroidism or hyperthyroidism and, in some people, autoimmune thyroiditis.
What is the optimal range for Iodine?
The standard reference range for Iodine is 52-109 μg/L, WHO optimal:100-199 μg/L. Optimal ranges may differ based on individual health goals and expert recommendations.
Which blood test providers include Iodine?
1 out of 22 blood testing providers include Iodine in their panels. This biomarker has limited availability.
What category does Iodine fall under?
Iodine is categorized under Thyroid Function. This category includes biomarkers that help assess related aspects of health and wellness.
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Medical Disclaimer
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs.
Last reviewed:2026-04-12