Low Iodine (urinary): what it means
A Iodine (urinary) result below the normal range is considered low. Here is what a reduced Iodine (urinary) can point to, and when it is worth discussing with a doctor.
Reference range: urinary iodine ~100–299 µg/L indicates adequate intake at population level; iodine reflects recent intake and is best interpreted for groups, not single individuals
Understand your full resultWhat a low Iodine (urinary) can mean
- Dietary iodine deficiency — low intake of iodised salt, dairy or seafood; the leading preventable cause of goitre and hypothyroidism worldwide.
- Pregnancy and breastfeeding — higher needs make deficiency more likely and more consequential for the baby.
- Restrictive diets — avoiding dairy, iodised salt and seafood (e.g. some plant-based diets).
- Living in an iodine-poor region — low-soil-iodine areas.
When to discuss with a doctor
Iodine status is judged mainly from a urine iodine level, and because it varies with recent intake it is best interpreted for groups rather than as a single diagnostic value in one person — so it is usually read alongside thyroid tests and the clinical picture. The situation where iodine matters most is pregnancy and planning pregnancy, when adequate iodine is important for the baby's brain and many guidelines recommend a supplement; and in someone with a goitre or an underactive thyroid, iodine intake is part of the assessment. Both too little and too much iodine can upset the thyroid. Mediora.AI can show a urinary iodine result alongside thyroid function (TSH, free T4) and thyroglobulin so the pattern is read together; interpreting iodine status and deciding on supplements, especially in pregnancy, belongs with your doctor.
Conditions this can relate to
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Upload your test - freeMediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.