Table 1.

Concurrent labs were collected during a supervised fast

	Reference range (for hypoglycaemia)	Patient test results
Glucose (mmol/L)	<3.1	2.9
Insulin (uIU/mL)	<3	1
c-peptide (nmol/L)	<0.27	0.17
Proinsulin (pmol/L)	≤8	<1.6
BOHB (mmol/L)	>2.8	0.47
FFA (mmol/L)	>0.78	1.19
IGF-I (ng/mL)	27–228	79
IGF-II (ng/mL)	180–580	244
Anti-insulin receptor Ab	Negative	Negative
Carnitine (μmol/L)	26–66	24.6
8AM cortisol (nmol/L)	>348	627

Normal values quoted are what is expected during fasting, except for IGF-I, IGF-II, anti-insulin Ab, carnitine and 8AM cortisol level, for which reference range is not defined based on glucose level.

BOHB, Beta-hydroxybutyrate; FFA, free fatty acid; IGF, insulin-like growth factor.