Discuss the use of glycated haemoglobin (HbA1c) in the diagnosis of diabetes mellitus

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Please include:
World Health Organisation criteria for diagnosis of diabetes mellitus, including the gold standard and WHO glucose criteria.
What is glycated haemoglobin?
How do we test for it/measure it?
What are the WHO criteria for the diagnosis of diabetes mellitus using HbA1c and how are these used in guiding treatment?
What are the limitations of using HbA1c for the diagnosis of diabetes mellitus?
When might it not be appropriate to use HbA1c for the diagnosis of diabetes mellitus?