When to follow your sick day plan Diabetes Home Sick days When to follow your sick day plan Go to hospital when What are ketones? How do ketones happen? What to do when you have ketones You have ketones. How do you feel? You have ketones. What do you do? Your plan tells you how to look after your diabetes. It is only for days you are sick. Use your plan. It will tell you what to do when You feel sick. or Your blood sugar is too high. Like 15 or more than 15 . or It is high for 6 hours more than 6 hours or Your ketones are too high. Like more than 0.6 . Read more about Ketones. Click here to read more. Back Diabetes Home Next This is general information. Talk to your doctor for information made for you.