Table 3.

Features distinguishing gestational transient thyrotoxicosis from Graves’ disease in patients presenting with thyrotoxicosis in the first trimester of pregnancy.

Feature	GTT	Graves’ disease
Symptoms of thyrotoxicosis BEFORE pregnancy	No	Often
Symptoms of hyperemesis gravidarum (nausea/vomiting)	Often	Usually not present
Personal of family history of thyroid disease	Usually absent	Often present
Presence of goitre	No/small	Diffuse goitre may be present
Signs of thyroid eye disease	No	May be present
fT3 concentration	Usually normal or mildly raised	Raised
TRAb concentration	Normal	Raised