The following table presents the median urinary iodine concentration +(UIC) that indicates iodine status among different population +groups.
+| Median urinary iodine concentration +(microgram/L) | +Indication of population iodine +intake | +Indication of population iodine +status | +
|---|---|---|
| < 20 | +Insufficient | +Severe iodine deficiency | +
| 20-49 | +Insufficient | +Moderate iodine deficiency | +
| 50-99 | +Insufficient | +Mild iodine deficiency | +
| 100-199 | +Adequate | +Adequate iodine nutrition | +
| 200-299 | +Above requirements | +May pose a slight risk of more than adequate iodine +intake in these populations | +
| ≥ 300 | +Excessive | +Risk of adverse health consequences (iodine-induced +hyperthyroidism, autoimmune thyroid disease) | +
| Median urinary iodine concentration +(microgram/L) | +Indication of population iodine +intake | +Indication of population iodine +status | +
|---|---|---|
| <150 | +Insufficient | ++ |
| 150-249 | +Adequate | ++ |
| 250-499 | +Above requirements | ++ |
| ≥500 | +Excessive | ++ |
Median urinary iodine concentration (microgram/L) | +Indication of population iodine intake | +Indication of population iodine status ≥500 | +Insufficient | ≥100 | Adequate |
+It is important to note that only population-level assessments of +iodine status are possible from the survey methodology of casual, spot +urine sample collection. Iodine status estimates based on the +methodology of casual spot urine sample collection cannot be used to +classify individual status and should not be presented as a prevalence +of deficiency or adequacy. The information provided in the table above +is frequently misinterpreted to reflect the situation of individuals. +The correct interpretation is that populations with a median urinary +iodine <20 microgram/L have “severe” iodine +deficiency, populations with a median urinary iodine 20-49 microgram/L +have “moderate” iodine deficiency, and populations with +a median urinary iodine 50-99 microgram/L have “mild” +iodine deficiency.