Insulin Autoimmune Syndrome: A Systematic Review

Table 5

The key points of IAS differential diagnosis.

Differentiation point/disease	IAS	Insulinoma	Type B insulin resistance
High-risk population	East Asian people (especially Japanese)	Unknown	Black women
Insulin	>1000 mU/L	<1000 mU/L	Elevated
Insulin/C-peptide molar ratio	>1	<1	<1
IAA	Positive	Negative	Negative
Insulin recovery following precipitation with PEG	Low (5–10%)	Normal (>70%)	Normal (>70%)
Abdominal CT	Generally negative	Space occupying lesion	Generally negative