Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Diagnosis of Diabetes and Prediabetes ?
    ### Response:
    Health care providers test for gestational diabetes using the OGTT. Women may be tested during their first visit to the health care provider after becoming pregnant or between 24 to 28 weeks of pregnancy depending on their risk factors and symptoms. Women found to have diabetes at the first visit to the health care provider after becoming pregnant may be diagnosed with type 2 diabetes.
    