Which blood tests require fasting?

When some people go to the hospital for a blood test, the doctor will tell you to fast and not eat any food or drink any water. In fact, blood tests are very important, but blood tests also contain a lot of content. Why do you have to fast for blood tests? In fact, you must pay attention to some examination items during the fasting examination. For example, you must know the many fasting examination items mentioned below. Let's take a simple look at which blood tests require fasting.

The items that generally require fasting blood tests in the morning include:

1. Various blood chemistry tests. Blood glucose, total blood lipids, cholesterol, triglycerides, β-lipoprotein, serum protein electrophoresis, carbon dioxide binding capacity, various serum enzymes, alpha-fetoprotein, serum immunoglobulin, mucin, etc.

2. Blood liver function test.

3. Blood renal function test.

4. Glucose tolerance test.

5. Serological and immunological examinations. Such as total complement, C3, rose petal test, antinuclear antibody, hepatitis B surface antigen, Widal reaction, antistreptolysin "O" assay, rheumatoid factor test, etc.

6. Various blood rheology tests. Such as whole blood viscosity, plasma viscosity, serum viscosity, platelet viscosity, etc.

Some blood tests can be checked at any time, such as red blood cells, white blood cells, platelets, etc. Some blood tests require blood draw in the early morning on an empty stomach (without breakfast), such as kidney function, liver function, erythrocyte sedimentation rate, blood sugar, etc. This is because:

1. Avoid the influence of factors such as diet on certain components in the blood. Because food is absorbed into the blood through the gastrointestinal tract and then transported throughout the body by the blood, the concentration of certain components in the blood will increase, affecting the accuracy of the test results.

2. After eating, various digested food chylomicrons are quickly absorbed into the blood, making the blood appear turbid, usually called "fatty blood", which makes it difficult for the examiner to observe clearly.

3. Emotions are relatively stable in the early morning and the body is in a basal metabolic state. The results obtained can more truly reflect the actual situation.

The so-called fasting means not eating after dinner and not having breakfast the next morning. In this case, blood test is most effective.

When patients go to the hospital for examination, which blood tests require fasting? The above items require fasting for examination. In fact, fasting blood test can correctly perform the examination, and can also better check the results, and can also judge the accuracy of the test results. It is necessary to fast for blood test, which can increase the accuracy of the test results.