if my BS is over 10, two - three hours or more hours after eating ,I correct it by injecting 1 unit for every 2 mmol over 7.0 so if I read 14.0 I inject 3 units (if it's odd number I always round down) which brings my reading down to roughly 7.0 Please note that This works for me,and other people will require different amounts .I had to find out what worked by adjusting gradually .I also now do this at night as, now I have been doing this for some time I know I am safe, and have not as yet expierienced a hypo at night. Though I wouldn't recomend doing this at night until you know exacly what amount you know is safe for you. I had to set my alarm every couple of hours to test during the night when first starting this regime. I generally only go high when I have to guess the amount of carbs in my food and miscalculate, as I normally inject 1 unit for every 8g of carb, so if its high its because I guessed wrong, I do try to correct my bg ,as I myself do not see the point of testing unless I am going to do something about it if it is too high. but what works for me might not for others so it's up to you whether you decide to try and correct them, if you do just be careful and do it in small amounts until you know the correct amount for you. I only increase my Levimir if high in the morning. if high 2 to 3 hours after eating it is because you did not have enough fast acting insulin at your last meal, but remember these can work up to 5 hours so if only slightly high then leave it.
) at last meal, and are confident about the carbs and dose needed. 