Blood draw to fasting? What is the effect of taking blood after eating

May 12, 2023

Now many hospitals have clear rules, the first thing after entering the hospital is to check the routine items, it is required to draw blood, then this blood draw are required to fasting? Will having blood drawn after eating affect the test results?

Do you need to fast for a blood test?

It is not necessary to fast for a blood test. For example, in the routine blood test in the hospital, the test items are mainly related to the count of various cells and immunoproteins, and it does not matter whether you eat or not if you do not check your blood lipids and blood sugar.

It is better to have a blood draw on an empty stomach or a blood draw with a meal

It is good to have a blood draw on an empty stomach. For the accuracy of the examination, it is best to draw blood on an empty stomach, because the standards of many examination items are set by the amount of blood drawn on an empty stomach, after eating blood sugar and lipids in the blood is higher, the blood test results may affect the accuracy of the examination items.

What tests require fasting blood

In medicine fasting blood glucose, blood lipids, kidney function (mainly blood urea and blood uric acid), liver function (mainly bilirubin, transaminases), blood viscosity, need to fasting examination and other such functional tests of blood tests must be strictly fasting, while coagulation function, glycosylated hemoglobin, blood routine, blood sedimentation, immune all laboratory items such as hepatitis B three series, hepatitis full set, all kinds of hormones, myocardial markers, thyroid function, Tumor markers, auto-antibodies, wind-like off and other tests require patients not to eat high-fat food is good, not a clear requirement to fasting.

What tests should be done after meals

There are blood tests before meals, and there are also some tests that require meals to come, such as half, 1, 2 and 3 hours after meals blood glucose, C-peptide, insulin, etc. These to check blood glucose or specific enzyme functions require blood to be drawn after meals to find out the specific situation.

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