Synnovis HbA1C results - Positive bias

[Sugarcube2021]

I recently received my h1ac results via the NHS app, however there is a message saying that there is a positive bias by an average of 2 mmol/mol higher than previous results.

Does this mean that when comparing my results to previous tests, i should reduce the result by 2mmol to compare like for like?

Does anyone have more information on this issue?

NOTE, recent HbA1c reagent change may cause a positive bias to results

which are an average of 2 mmol/mol higher than previous. Recommend use

glucose for diagnosis of diabetes - refer to related Synnovis comms

sent on 6/10/25.