My glucose tolerance test results are: fasting: 100 mg/dl, 1hr: 148mg/dl, 2hr: 128 mg/dl. My hbc1a : 5.7. I am concerned....Am I prediabetes?

Probably not. The fasting glucose of 100 and hba1c of 5.7 are borderline high, the other tests are normal. Diabetes is defined by fasting glucose above 125 or post prandial glucose above 200, or hba1c above 6.5%. People with prediabetes will typically also have triglycerides above 150, HDL cholesterol under 50 in a female, hypertension, and obesity.