Phenotypes of Congenital Hyperinsulinism

Description

Congenital Hyperinsulinism is the most common cause of lowblood sugar (hypoglycemia) in infants and children.  Infants who are born with this problem havelow blood sugar, which can cause seizures or brain damage. 

We are doing this study to see if the patterns ofabnormalities in controlling insulin in children and adults withhyperinsulinism are related to any underlying genetic cause and to identifypossible new genetic causes.  This willbe done by standard clinical tests of insulin control: a glucose tolerancetest, a protein tolerance test, and a fasting test.

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