When assessing a person who has diabetes with an unexplained high blood glucose level, it is essential to ensure that they are taking the insulin as advised.

Missing doses regularly can adversely affect diabetes control and contribute to hyperglycaemia (see Carlos case study for an example of hypoglycaemia). Some people find times when diabetes does lower their mood, which can be when they may omit treatment with insulin.

They may also reduce their physical activity, eat meals or snacks high in carbohydrate content which can contribute to high glucose levels.