Let’s find out what the result of a blood glucose (sugar) test tells us.

After you’ve done a blood test, your meter will show you a number. The number tells you how much sugar (glucose) is in your blood. The number won’t always be the same. Your doctor or nurse will tell you what numbers you should be aiming for.

For most children it’s:

  • between 4 and 7mmol/l when you wake up and before meals
  • between 5 and 9mmol/l after meals

But your doctor or nurse might give you other numbers to aim for and that’s OK because we are all different.

Why is there sometimes too much sugar in my blood?

There are lots of possible reasons. It could be because:

  • you forgot to take your insulin
  • you didn’t run around and play as much as usual today – perhaps you sat around watching the TV
  • you ate more food than usual
  • you are growing taller – as you do, your body needs more insulin to keep your blood sugar levels just right
  • you were ill
  • you're on a pump and it stops working
  • sometimes it just happens and nobody knows why.

Why is there sometimes not enough sugar in my blood?

Again, there can be lots of reasons. It could be because…

  • you had more insulin than you needed
  • you did lots of running around and didn’t eat any extra snacks
  • you didn’t eat enough at your last meal to match your insulin
  • you forgot your snack
  • sometimes it just happens and nobody knows why.

Why aren’t my levels always just right?

It’s impossible to always have blood sugar levels that are ‘just right’. Don’t worry though – everyone with diabetes has times when they find it tricky to control their levels. Your doctor or nurse can give you and your mum and dad lots of things to try if your blood sugar is higher or lower than it should be a lot of the time.


  • A blood glucose meter counts how much sugar is in your blood and tells you the answer.
  • The answer is given as a number.
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