Partial thyroxine-binding globulin (TBG) deficiency, with a median TBG
of 2.3 mg/l, was found in 25 mature babies with hypothyroxinaemia (3
girls and 22 boys) from our screening programme for congenital hypothy
roidism during 1988-1990. Analysis of the HLA system revealed the poss
ibility that antigen DR6 may be considered as a risk factor for TBG de
ficiency (44.0 vs. 19.2%) and DR2 as a protective factor (16.0 vs. 37.
5%). Similar laboratory findings were also present in 16 mothers and 1
father.