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Doctor insights on: Fasting Before Glucose Test

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How much water is okay to drink before fasting glucose test ?

How much water is okay to drink before fasting glucose test ?

Not a big deal: The amount of water is not terribly important - 12-16 oz should be fine. Be sure you are fasting (not eating) for the required number of hours. ...Read more

Blood Sugar (Definition)

The blood sugar concentration or blood glucose level is the amount of glucose (sugar) present in the blood of a human or animal. The body naturally tightly regulates blood glucose levels as a part of metabolic homeostasis. Glucose is the primary source of energy for the body's cells, and blood lipids (in the form of fats and oils) are primarily ...Read more


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3 hour glucose test results: fasting was 89, thirty minutes was 180, one hour was 198, two hour was 64.... what does this tell me?

Normal: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, your results are within the normal limit. The one hour level is at the borderline. See this site for more info. http://www.nlm.nih.gov/medlineplus/ency/article/003466.htm ...Read more

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How do fasting insulin test and glucose test differ?

How do fasting insulin test and glucose test differ?

Different tests: Insulin & glucose are 2 different ways to measure diabetes. Insulin is produced by pancreas to keep sugars under control. We measure glucose to see how well sugars are controlled. We can measure Insulin to determine how much effort pancreas is making to control sugars. Think of glucose as speedometer & Insulin as tachometer (hgba1c is avg trip speed - ask a car nut if this doesn't make sense). ...Read more

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How long do you have to fast for an elevated fasting glucose test?

How long do you have to fast for an elevated fasting glucose test?

8-10 Hrs: I ask my patients to fast 8-10 hours, minimum. Please take your meds on schedule (except dm meds - ask your dr), and get plenty of water, so your veins are full.. ...Read more

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Can a fasting blood glucose test alone tell you if you have diabetes?

Can a fasting blood glucose test alone tell you if you have diabetes?

Yes, absolutely: Hi. Yes, a fasting serum glucose is easily diagnostic of diabetes. There are 4 means of diagnosing diabetes: fasting serum glucose, random serum glucose, 2-hr glucose tolerance test, and A1c. Fasting glucose is an easy test, and if positive, should be repeated for confirmation. Eat healthily and exercise regularly. Keep your diabetes, blood pressure, and lipids well controlled. DON'T SMOKE! ...Read more

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Can a fasting blood glucose test alone tell you that you have diabetes?

Can a fasting blood glucose test alone tell you that you have diabetes?

Needs confirmation: A single fasting blood sugar over 125 needs confirmatory tests to diagnose diabetes. this can be a second fasting blood sugar over 125, or a Hemoglobin A1c test over 6.5%. However any sugar over 300, or any sugar over 200 associated with vision change, excessive thirst or urination, or weight loss while eating more than usual is diagnostic for diabetes without a need for confirmatory testing. ...Read more

Dr. Cayce Jehaimi
2,570 doctors shared insights

Glucose (Definition)

Glucose is the basic sugar molecule and the source of energy throughout the living kingdom. We are programmed to easily detect it by taste in our foods as it is desirable but can be overdone with the modern diet. It gets out of control ...Read more


Dr. Adam Lewis
129 doctors shared insights

Blood Sugar Monitoring (Definition)

Blood glucose monitoring refers to the ongoing measurement of blood sugar (glucose). Monitoring can be done at any time using a portable ...Read more