Neonatal thyroid screening as a monitoring tool for the control of iodine deficiency

Area of Science:

• Endocrinology
• Public Health
• Neonatal Medicine

Background:

• Iodine deficiency is a global health concern impacting brain development.
• Elevated neonatal thyroid-stimulating hormone (TSH) is a primary indicator of insufficient thyroid hormone supply.
• Brain damage is the most significant complication of iodine deficiency in newborns.

Purpose of the Study:

• To review studies on neonatal thyroid function in iodine deficiency.
• To confirm the utility of neonatal TSH screening for assessing iodine status.
• To establish TSH frequency thresholds for classifying iodine deficiency severity.

Main Methods:

• Review of existing scientific literature on neonatal thyroid function and iodine deficiency.
• Analysis of neonatal thyroid-stimulating hormone (TSH) levels in various iodine supply conditions.
• Comparison of TSH frequency distributions against established WHO/UNICEF/ICCIDD criteria.

Main Results:

• A TSH frequency above 5 mU/L blood below 3% signifies adequate iodine supply.
• Frequencies of 3-19.9%, 20-39.9%, and over 40% indicate mild, moderate, and severe iodine deficiency, respectively.
• Neonatal thyroid screening is a sensitive tool for population-level iodine status monitoring.

Conclusions:

• Neonatal TSH levels are a reliable indicator of iodine deficiency and potential neurodevelopmental risks.
• Population-level TSH screening provides crucial data for public health interventions.
• Maintaining adequate iodine supply is critical for preventing neonatal brain damage.