How is a diagnosis made?

Glucose levels are measured in blood samples. This is done using the following tests:

• random glucose test: glucose levels are taken at a random time on two occasions. Any figure above 11.1mmol/l is a diagnosis of diabetes
• fasting glucose test: the glucose level is measured after an overnight fast and on two different days. Above 7.0mmol/l is a diagnosis of diabetes.

You may only need to give one blood sample if you have other symptoms of diabetes.