By jhollingsworth Latest Reply 2009-05-12 10:22:31 -0500
Started 2009-05-07 11:56:55 -0500

How long should I wait to take a blood sugar reading after I eat?

10 replies

vfletcher 2009-05-12 10:11:05 -0500 Report

after 2 hrs your blood sugar should be in the fasting range. It will peak at between 45 min and 1.5 hrs. It is useful to know what your peak is, when it is, and how long it takes you to recover back to fasting levels if you want to closely manage your diabetes and have the best chance of avoiding the nasty complications.

kdroberts 2009-05-07 13:08:47 -0500 Report

2 hours gets banded about a lot and is technically the official target but I don't go along with it for a few reasons. I say it's something you'll have to figure out and it may depend on what you eat and when you eat it.

The most useful information you can get from a post meal test is roughly how high you peak so the goal is to find out when that is, it may be 1 hour, it maybe 2 hours, it maybe any where in between, higher or lower. Testing at 2 hours may be right but it could potentially do more harm than good. For instance if you test 2 hours after eating and are getting results around 120 you might think you're doing fine but what you didn't see was that after 1 hour your blood sugar was 200. Take a few weeks and test every 30 minutes after each meal (doesn't have to be all on the same day) and then figure out roughly when the high point of your spike is. Once you have that you can test at that time after each meal. It happens that for me 2 hours is about right (2.5-3 with high fat meals, that keeps tripping me up because I forget!) but I know people who test as quickly as 45 minutes or as long as 2.5 hours.

firefightermom 2009-05-07 12:43:31 -0500 Report

hey, we usually wait two hours also if you check it in 30 minutes after you eat it will be on the rise so then 45 minutes it will be higher and so on… but two hours is time enough for the food to reach it's peak and to see if we matched carbs to insulin correctly. hope that helps. i just realized this was type 2 question but i think it's the same 2 hours. my daughter is type one and we count carbohydrates abd match insulin to carbs on a sliding scale, like 1 unit insulin (novolog) to every 20 carbs eaten. do you count carbs?

jhollingsworth 2009-05-12 06:24:38 -0500 Report

I do count my carbs and try to keep them under 70/day…sometimes I'm a lot lower. For example, my carb intake yesterday was only 46…