GDM is defined as glucose intolerance which isfirst detected or
diagnosed during pregnancy, particular after 24 weeks of gestation
(ADA, 2012). Its manifestations include elevated postprandial and
fasting blood glucose. According to White's obstetric classification,
GDM is classified into two classes: class A1 and class A2. GDM class A1
is diagnosed when fasting plasma glucose is less than 105 mg/dL and
2-h postprandial blood glucose less than 120 mg/dL and can be
controlled with medical nutrition therapy alone. GDM class A2 is
defined when fasting plasma glucose is more than 105 mg/dL and 2-h