My glucose fasting level is 6.2. what does this level mean exactly?

A1c lab cutoffs: Hemoglobin A1c is a measure of sugar on red blood cells. Since red blood cells last 3 months, it is a 3 month moving average of blood sugar.

Av Glucose 143 mg/dL: according to this research: http://care.diabetesjournals.org/content/26/3/881.short. or http://www.medscape.com/viewarticle/427799. In human trials, an optimal HbA1c [for lowest rates of cardiovascular events (heart attacks, etc.) for middle age "normal/asymptomatic" people with zero history of health problems] within 5 years is 5.0%, corresponding to an average blood glucose of 100 mg/dL.