Blood sugar levels which refers an individual as diabetic are as following (although one such reading might not be sufficient and other clinical features might be included in making a diagnosis)-
- Fasting >126mg/dl
- Random >200mg/dl
- HbA1C (glycated hemoglobin) >6.5
- For diagnosis of gestational diabetes your doctor may need another test called glucose tolerance test in which you will be given certain amount of glucose drink and then checking your blood sugar levels after certain intervals.
Cross check the levels from other sources too.