美国和中国不同，多了一个糖尿病前期的阶段。。

A1C

The A1C test measures your average blood sugar for the past two to three months. The advantages of being diagnosed this way are that you don't have to fast or drink anything.

• Diabetes is diagnosed at an A1C of greater than or equal to 6.5%
   

Result	A1C
Normal	less than 5.7%
Prediabetes	5.7% to 6.4%
Diabetes	6.5% or higher