How to Pass a Blood Glucose Screening Test

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A blood glucose test is a diagnostic screening tool for diabetes, pre-diabetes, and hypoglycemia. Certain procedures must be followed to ensure an accurate test result. Most importantly, patients are expected to fast (go without food) for a designated amount of time before having their blood drawn. The results will fall into one of three categories: normal, pre-diabetic, or diabetic.


Discuss the blood glucose test with a physician. Plan on a date and time to have your blood drawn at the lab.

Fast for at least 12 hours before your blood sample collection. Only medication and water are allowed during the fast.

Tell the registration person at the lab about any medications that were taken during the 12-hour fast. Some medications can interfere with the accuracy of test results. They will determine if any of your medications will affect the results.

Allow the lab staff to collect a blood sample. Immediately afterwards, it is fine to begin eating and drinking as normal.

Wait to hear from your doctor about the results of the test. Depending on the facility, it may take up to a week to receive results. Many physicians only contact patients who have abnormal lab results. For patients monitoring chronic illnesses such as diabetes, however, most physicians will follow up to let them know how well they are managing the disease.

If you haven't received your results within two weeks of the test, contact your physician’s office. Discuss any questions or concerns with your physician. Blood glucose test results are interpreted differently depending on the test administered.

Tips & Warnings

  • Most labs accept walk-ins, so the patient can actually fast before their doctor’s appointment in order to get lab work accomplished on the same day.
  • Be sure to drink enough fluids during the 12-hour fast, so that the lab technicians will have an easier time finding a suitable vein from which to collected the specimen.
  • According to the American Diabetes Association (ADA), fasting plasma glucose (FPG) test results below 100 mg/dl are normal. Pre-diabetes is diagnosed at levels between 100 mg/dl and 125 mg/dl, and diabetes is diagnosed if the result is 126 mg/dl or greater.
  • According to the ADA, oral glucose tolerance test (OGTT) results below 140 mg/dl are normal. Pre-diabetes is diagnosed at levels between 140 mg/dl and 199 mg/dl, while diabetes is diagnosed if the result is 200 mg/dl or greater.
  • Consuming food within 12 hours of blood sample collection can lead to inaccurately high test results. Therefore, it is important to follow all procedures as outlined by the physician or lab.

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