Se. Noble et al., School based screening for hypothyroidism in Down's syndrome by dried blood spot TSH measurement, ARCH DIS CH, 82(1), 2000, pp. 27-31
Objective-To determine the feasibility of annual hypothyroid screening of c
hildren with Down's syndrome by measuring thyroid stimulating hormone (TSH)
on dried blood spots at school, and to describe the outcome in positive ch
ildren.
Design-Establishment of a register of school children with Down's syndrome,
and procedures for obtaining permission from parents, annual capillary blo
od samples, TSH measurement, and clinical assessment of children with TSH v
alues > 10 mU/litre.
Subjects-All school age children with Down's syndrome within Lanarkshire an
d Glasgow Health Boards during 1996-7 and 1997-8.
Results-200 of 214 school children with Down's syndrome were screened. Four
of the unscreened children were receiving thyroxine treatment, and only 5
remained unscreened by default. 15 of the 200 children had capillary TSH >
10 mU/litre, and all but 1 had evidence of Hashimoto's thyroiditis. Seven o
f the 15 children started thyroxine treatment immediately, 6 with a pronoun
ced rise in venous TSH and subnormal free thyroxine (fT4), and one with mil
dly raised TSH and normal fT4 but symptoms suggesting hypothyroidism. Fight
children with mildly raised venous TSH and normal fT4 were left untreated;
1 year after testing positive, fT4 remained > 9 pmol/litre in all cases, b
ut 4 children were started on thyroxine because of a rise in TSH. TSH fell
in 3 of the 4 remaining children and there was a marginal rise in 1; all re
main untreated. The prevalence of thyroid disease in this population is gre
ater than or equal to 8.9%.
Conclusion-Dried blood spot TSH measurement is effective for detecting hypo
thyroidism in Down's syndrome and capillary sampling is easily performed at
school. The existing programme could be extended to the whole of Scotland
within a few years.