Type 1 diabetes symptoms often appear very suddenly and are a sufficient reason for a medical checkup. Symptoms of other diabetes or prediabetes may appear gradually or not be so evident, therefor some medical checkups are advised for specific risk groups which are:
People with BMI of 25 and higher
Anyone older than 45 years of age
Anyone who has been diagnosed in prediabetes
Any woman who has had gestational diabetes
Tests for diabetes are mostly done by measuring blood sugar and do not require any special preparation such as fasting.