Possible prenatal diagnosis of type III glycogenosis.

This paper reports the first prenatal diagnosis in a pregnancy at risk for type III glycogenosis using a reliable test for amylo-1,6-glucosidase in cultured amniotic fluid cells. This test, based upon the different rates of glycogen and phosphorylase limit dextrin hydrolysis, was found to be more reliable in detecting a deficiency of amylo-1,6-glucosidase activity than either phosphorylase limit dextrin hydrolysis alone or [14C]glucose incorporation using leukocytes and cultured cells.