Table 4 Distinguishing features of type 1 and type 2 diabetes mellitus

Start

Abrupt and symptomatic

Slow consolidation, with few symptoms

Family history

5% T1D

75-100% T2D

Insulin resistance

uncommon

common

Obesity

Obese, normal or thin

Typically present

Polidypsia, poliuria

symptomatic

Usually absent or mild

Ketoacidosis

30-40% at diagnosis

5-25 % at diagnosis

Hypertension and hyperlipemia

-

+

Sleep apnea

-

+

Acanthosis nigricans

-

+

Polycystic ovary

-

+

C-peptide levels

Low

Normal or elevated

Anti-pancreatic antibodies

+ (70-90%)

Absent

Acanthosis nigricans

-

+