TABLE 1.

Laboratory test results

Hemoglobin A1c	7.0	%	(4.6–6.1)
Glucose	501	mg/dL
Urinary ketone	(4+)
pH	7.177		(7.35–7.45)
pCO2	10.1	mmHg	(32–48)
pO2	139	mmHg	(83–108)
${\text{HCO}}_3^{‐}$	3.6	mmol/L	(21–28)
Anion gap	10.1	mmol/L	(7.0–16.0)
Amylase	147	U/L	(44–132)
Lipase	208	IU/L	(6–48)
Acetoacetic acid	2190	μmol/L	(<55)
3‐OHBA	5060	μmol/L	(<85)
Serum C‐peptide	0.35	ng/mL	(0.8–2.3)
Urinary C‐peptide	11.6	μg/day	(29.2–167)
GAD antibody	Negative
IA‐2 antibody	Negative
ZnT8 antibody	Negative
Insulin autoantibodies	Negative
Glucagon stimulation test
C‐peptide (0 min)	0.55	ng/mL
C‐peptide (6 min)	1.03	ng/mL
HLA haplotype
DRB1	04:05	08:03
DQB1	04:01	06:01

The ranges of the reference values are indicated in parentheses. Abbreviations: ${\text{HCO}}_3^{‐}$, bicarbonate ion; 3‐OHBA, 3‐hydroxybutyric acid; GAD, glutamic acid decarboxylase; IA‐2, insulinoma‐associated antigen‐2; ZnT8, zinc transporter 8