Plasma glucose

If it is a hba1c blood test and the result is the average of 6.5.
That means you are on the cusp of prediabetes, just above normal levels.
A few lifestyle changes cutting down on carbs and sugars, should help get it back down within normal levels.

I will have to say this dietary choice is if you are not taking meds for any other conditions.

maybe a little more information from you, and we could suggest ideas for you.

Best wishes.