If I remember correctly its a fasted blood test. make sure they clarify this as they didnt tell me so I pitched up having had breakfast in the mess, and not surprisingly, the results came back abnormal... (retested later and results normal)
now what was strange was the look of disbelief on the nurses face when i told her that unless they tell me beforehand that i need to fast, then i will carry on eating meals....is that being unreasonable???