Table 1. Insulin and C peptide levels during arterial stimulation and venous sampling (ASVS) in an adult patient with insulin autoimmune syndrome (insulin results were only available after 1/50 dilution of the serum).

	Basal		30 seconds		60 seconds		120 seconds
Arteries	Insulin	C peptide	Insulin	C peptide	Insulin	C peptide	Insulin	C peptide
Hepatic	5795	4.3	7605	4.3	6395	4.5	7185	4.0
Distal splenic	3955	3.2	4005	3.6	4590	3.9	4895	3.7
Proximal splenic	5330	3.8	5170	3.6	5520	3.5	5050	3.9
Gastroduodenal	7035	4.3	5785	4.2	7865	4.2	6365	4.2
Superior mesenteric	7740	4.4	5555	4.3	6245	4.5	6090	4.4

Reference values: insulin: 5 – 25 μIU/ml; C peptide: 0.8 – 4.0 ng/ml.