GP reported fears last year that changing the reporting method could cause confusion (GP, 24 October 2008).
Measurements will switch to being reported in mmol/mol rather than percentages, giving a greater numerical value.
The changes are now due to take place on 1 June, Diabetes UK has said Implementation had been planned for 1 April.
Laboratories will initially give results in both units, said Diabetes UK care adviser Pav Kalsi: 'Change may cause confusion, so to help make the transition as easy as possible, all HbA1c results in the UK will be given in both percentage and mmol/mol until 31 May 2011.'
Three packs explaining the changes are available from the charity's website.
Mrs Kalsi said the move would standardise HbA1c measures worldwide.
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