how long after having dinner is the best time to check your sugar

Hi Carmine,

The food will start to raise your blood sugar around 15 minutes after you eat. If you're trying to ensure that you took enough insulin and prevent a high blood sugar, try checking again between 30 to 45 minutes and again after about an hour and a half from when you ate.

Here's a link, too, to how to determine your insulin-to-carbohydrate ratio for meals.

-Ginger

It depends on the insulin that you are taking, and the time it takes for that insulin to "peak."

If I'm not worried about being very high, I wait the full two hours to test.  My doctor has always told me that Humalog takes two hours to fully peak.  If I wait, I can be sure that my blood sugar is probably relatively stable, so I won't take too much insulin as a correction.

If I really feel like I spiked, I will test earlier, about an hour or and hour and a half after.  Usually I can tell if I will need extra insulin. 

And of course, if I feel low, I always test right away and have a snack. :)