If you are feeling unwell, then it is best to wait until you feel better before you take your test. This is because illnesses such as colds and flu can affect your blood test results and cause short term changes which might lead you to be anxious for no reason. They also don't reflect what is normal for you.
If you are suffering from any illnesses or symptoms which you think might affect your results then please let our doctors know. You will have the opportunity to do this when you log into your portal. This gives our doctors important context when they are providing comments and advice.