Are you absolutely certain that is what your Doctor and diabetes nurse say, BE?Nope, in England it is up to one month according to both my Doctor and diabetes nurse.
It's very strange, because the NHS says differently. See the link below...
https://diabetesmyway.nhs.uk/resources/ ... explained/
Blood glucose levels vary throughout the day and from day to day, but HbA1c gives an average of what the glucose is over a longer 2-3 month period. HbA1c should be measured regularly but not too frequently. You will normally be tested every three to six months