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Living with Hypothyroidism due to iodide transport defect

An underactive thyroid in which the thyroid has trouble taking in iodide, linked to changes in the SLC5A5 gene.

Understanding Hypothyroidism due to iodide transport defect

Hypothyroidism due to iodide transport defect is a condition in which the thyroid gland has reduced ability to take in iodide.

Iodide is needed to make thyroid hormone. The thyroid's follicular cells do not bring in enough of it. GARD says inactivating changes in the SLC5A5 gene, which makes the sodium-iodide symporter, are responsible.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet.

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
How is thyroid hormone replaced and monitored?
Does iodine intake matter for my case?
Would genetic testing for SLC5A5 help our family?

Quick facts

Inactivating changes in the SLC5A5 gene, which makes the sodium-iodide symporter, are responsible for this condition.

Also known as: gdth i; genetic defect in thyroid hormonogenesis i; hypothyroidism due to iodide concentration defect; iodide transport defect; iodide transport failure; iodine accumulation defect

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Hypothyroidism due to iodide transport defectGARD ID 2938 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Hypothyroidism due to iodide transport defect.

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