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Doctor insights on: What Happens If You Have Diabetes And Eat Before A Blood Test

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Could you tell me what happens if you have diabetes and eat before a blood test?

Could you tell me what happens if you have diabetes and eat before a blood test?

Post-prandial result: Although most blood tests are supposed to be done in the fasting state, the after-meal (or post-prandial) glucose result can be very useful in certain settings. If you have diabetes and do a blood test after eating, the result can help determine whether you are eating too much carbs or need medication adjustments. American diabetes assn recommends a post-prandial glucose target less than 180 mg/dl. ...Read more

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Dr. Quang Nguyen
3,215 doctors shared insights

Diabetes (Definition)

Diabetes is a disease of increased blood glucose levels. Glucose is a type of sugar that comes from the intake of food. Insulin is a type of hormone that removes the glucose from the blood and moves it into the cells to provide them with energy. There are two different types of diabetes: type 1 and type 2. Type 1 diabetes is when the body does not make any insulin. Therefore, glucose stays inside the blood and does not move into the cells. Type 2 diabetes, which is commonly associated with obesity, is when the body is either resistant to the effects of insulin or when the body does not produce enough insulin. Increased levels of glucose in the body causes severe damage to the ...Read more


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It happens that a blood test for diabetes miss it?

It happens that a blood test for diabetes miss it?

It depends>>>: Blood tests do have some error rates, so at times we have to repeat them to confirm the results. But sugar is a simple test and there is little room for mistakes. But the blood sugar does fluctuate depending on eating and from day to day. So it is a good idea to have 2 or 3 readings to be more certain about the real picture. ...Read more

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Can there be a way i can test if I have diabetes besides a blood test?

Urine test?: In untreated diabetes when you are passing glucose in the urine it will show in urine test.But it is a crude test and has to be followed up with blood test for glucose and a1c hemoglobin to design the treatment. ...Read more

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I have all the symptoms of diabetes but blood test comes back negative. Any possible explanation?

I have all the symptoms of diabetes but blood test comes back negative. Any possible explanation?

Depends on symptoms: If you have excessive thirst and excessive urination, it is possible to have 'water' diabetes (diabetes insipidus) rather than 'sugar' diabetes (diabetes mellitus); these require different tests. Some people with diabetes have weight loss, fatigue, blurred vision, extreme hunger -- these can be due to lots of things, but thyroid, blood counts, and iron should be checked. See an eye dr. ...Read more

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I had a blood test a year ago. Everything was fine. I am worried could I have developed diabetes by now?

I had a blood test a year ago. Everything was fine. I am worried could I have developed diabetes by now?

Depends: Are you overweight or otherwise at risk for diabetes? You are unlikely to develop type I diabetes at 20 years old. Things can change in a years time, so talk to your doctor about your risk factors, and if needed another blood test could be done. ...Read more

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How to avoid blood test for checking diabetes?

How to avoid blood test for checking diabetes?

Health Testing: Not sure why or what you are asking from us here. To determine the blood sugar one needs a blood test. ...Read more

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Could diabetes be detected in an HIV blood test?

Could diabetes be detected in an HIV blood test?

No.: Unless you had your blood drawn at the same time for these two very different tests, an HIV test cannot tell if you have diabetes. You don't know what is done with your blood after it is drawn, though, and your blood might also have been tested for sugar, which is high in diabetes mellitus. Good luck! ...Read more