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If you are doing a standard blood glucose test, 30 minutes to an hour after a meal usually gives the best indication. The problem with the accuracy lies in the glycemic index of the foods consumed during the meal. The glycemic index is important as high index foods break down in the digestive system and spread out the nutrients, sugars and fats quickly and low index foods take longer to break down.
Another problem is that not all high and low glycemic index foods mean bad and good respectively, they vary. Sweets like jelly beans are extremely high in glucose, but are a very high index food, so it breaks down in the system quickly and the sugar levels drop not long after. Doesn't mean they are better for you, it just means they give a hard sugar fix quickly and that is not really a good thing. At the same time, you don't want to be eating a sweet food that is a low index as the sugar levels stay high for too long and make levels difficult to control.
If you a doing a specific glucose stress test, like one ordered by a doctor or one done at a pathology clinic, then 2 hours after you eat, but this test is usually designed to give you plenty of glucose to see how well your system can break it down.
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Do you have to fast before a coumadin blood work?
No, you do not have to fast.
Fasting before blood draw?
You only need to fast before blood work if you are having a fasting blood glucose blood test. Not each blood drawing will require you to fast. If you are required to fast, you may still drink water before your blood work.
How long do you fast for a fasting blood test for metabolic functions?
that depends how fast you can fast when fasting for a fasting blood test for metabolic functions.
Does drinking herbal tea affect a fast before blood work?
As long as you don't put sugar or honey in it it'll be ok
How do blood capillaries work?
it works better and move fast trough your blood vessels.
Will a 12hr fast instead of an 8hr fast work ok before a blood test?
yes
How long do you fast before having blood drawn?
It rather depends on why blood is being drawn?
Can you fast to long prior to blood draw?
Yes,Body will be to weak.
Do You need to fast for Intact PTH blood work?
Yes, you need to fast. You should fast from food for approximately 12 hours, and fast from fluids for approximately 8 hours.
Can you have skim milk before a blood test?
If you are having blood work done and are told to fast, then you can drink nothing but water. If it is non-fasting, then you can have coffee, but be sure to tell the person doing the blood work.
How long do you fast before a lipids blood test?
Twelve hours, according to my cardiologist.
How long should I fast for a tsh blood test?
No. Fasting is only required for lab tests which examine lipids, sugars (blood glucose, glycohemoglobin, etc.) and amino acids.
