Dear Mr. Arindam,
Would like to know a bit details:
Age, height, weight
Family history of diabetes?
Seeing 7.8 hba1c
suggests two possibilities.
1) Instrument error. In that case repeat the Hba1c test from two different standard labs. Along with Fasting and post meal tests.
2) Assuming the test is correct - It shows that your sugars shoot up at sometime during 24 hours (not necessarily during fasting and post breakfast or post lunch times, but say post dinner, pre dinner times. Inshort, some time during 24hrs.)
I'd advise you to investigate yourself with your physician/diabetologist/endocrinologist
and recheck Fasting, Post meal sugars, Hba1c and thyroid
profile from a standard lab.
Hope this helps.