Abstract
This study investigated thyroid dysfunction in 160 adults with Down syndrome; mean age 43.4 years, 57.5% over the age of 40 years. Thirty-five percent had evidence of thyroid dysfunction with subclinical hypothyroidism (11.9%) and definite hypothyroidism (8.1%) being the commonest abnormalities. An association between thyroid dysfunction and thyroid autoimmunity was found (P= 0.01). Monitoring of thyroid status in subjects on thyroxine replacement was found to be poor. Recommendations are discussed.

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