Information for the public
Tests for diabetes
If you think that your care does not match what is described in this information, please talk to a member of your healthcare team in the first instance.
If you've had high blood glucose after an acute coronary syndrome but you don't have diagnosed diabetes, you'll be offered tests for diabetes during or soon after your hospital stay. Before you're discharged the doctor or nurse will take a blood sample to measure haemoglobin A1c (HbA1c, also known as glycated haemoglobin). HbA1c indicates the level of your blood glucose over the past 2–3 months and will help to show whether you had diabetes before you were admitted to hospital.
Four or more days after you were taken ill you'll have another blood sample taken to measure your fasting blood glucose levels. You'll be asked to fast (go without food and any drink except water) for 8 hours before the test. The test will usually be in the morning. You may have this second blood test after you leave hospital.
If your HbA1c or fasting blood glucose level is high and your healthcare team is still unsure whether you have diabetes, you may have another test called an oral glucose tolerance test. For this test you'll be asked to fast overnight, have a blood sample taken in the morning and then drink a glucose drink. You'll then have another blood sample taken after 2 hours to see how much the glucose level has risen. If this test suggests you have diabetes, the healthcare team will advise you about treatment, including a healthy lifestyle.