Gestational diabetes classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Classification

There are 2 types of gestational diabetes (diabetes which began during pregnancy):

• Type A1: diet modification is sufficient to control glucose levels
• Type A2: insulin or other medications are required

Additionally, it is useful to classify different forms of diabetes during pregnancy which existed prior to pregnancy:

• Type B: onset at age 20 or older or with duration of less than 10 years
• Type C: onset at age 10-19 or duration of 1-19 years
• Type D: onset before age 10 or duration greater than 20 years
• Type F: diabetic nephropathy
• Type R: diabetic retinopathy
• Type H: diabetes with ischemic heart disease
• Type T: diabetes requiring kidney transplant