Hi. The HBa1c test looks at your haemoglobin and from that can detect the average blood sugar you have had over the last 3 months. It is weighted towards the last month or so due to the normal death of red blood cells. The normal value is around 5.5 to 6.5% using old money (the measure previous to last year). Above this value hints at diabetes. The readings you have seen may be in new money so go to this link to convert from one to the other: