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Understand Iodine

Iodine

Mineral & electrolyte markers

What the test generally measures, and what to ask about it.

Longetic keeps every lab and record you’ve had organized and easy to find, so your own Iodine values sit together on one chart and you walk into your next appointment prepared.

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Updated Jul 13, 2026

What is Iodine?

A trace mineral your thyroid needs, and this test measures the amount present in a blood sample.

Your thyroid gland uses iodine to make hormones that help control energy and metabolism. Iodine status is more often checked in urine, but a blood measurement can also be used in certain situations. A level that is low or high can be associated with diet, supplement use, or recent exposure to iodine-containing substances. It is a specialized test rather than a routine one.

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Terms of Use.

References

Official source "Iodine - Health Professional Fact Sheet" NIH Office of Dietary Supplements. ods.od.nih.gov/factsheets/Iodine-HealthProfessional.

About our sources

Clinical / professional

Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.

Peer-reviewed research

Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.

History of updates

Published · Jul 13, 2026
First published, written from official sources (final verification pass pending).

Keep your Iodine results together in one place

Upload a lab, and Longetic reads it, explains it, and reminds you when it's time to re-check — so nothing slips between visits.