A blood glucose test measures the amount of a sugar, called glucose, in a sample of your blood.
Glucose is a major source of energy for most cells of the body, including those in the brain. The carbohydrates you eat eventually end up as glucose in the blood.
See also:
Alternative NamesRandom blood sugar; Blood sugar level; Fasting blood sugar
How the test is performedBlood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.
Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm.
Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.
In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding.
How to prepare for the testThe test may be done while you are fasting or at random.
If you are having a fasting glucose blood test, you should NOT eat or drink for 8 hours before the test.
A random glucose test can be done at any time of the day, but results depend on what you drink or eat before the test, as well as your activity.
How the test will feelWhen the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performedYour doctor may order this test if you have signs of Diabetes. However, other tests (glucose tolerance test and fasting blood glucose test) must be used to diagnose diabetes.
The blood glucose test is also used to monitor patients who have the diabetes. It may also be done if you have:
Levels vary according to the laboratory, but in general up to 100 milligrams per deciliter (mg/dL) are considered normal for a fasting blood glucose test.
Persons with levels between 100 and 125 mg/dL have impaired fasting glucose, or prediabetes. These levels are considered to be risk factors for type 2 diabetes and its complications.
Diabetes is diagnosed in persons with fasting blood glucose levels that are 126 mg/dL or higher.
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What abnormal results meanGreater-than-normal blood glucose levels (hyperglycemia) may be a sign of diabetes. In someone with diabetes, it may mean the diabetes is not well controlled.
Increased levels may also be due to:
Lower-than-normal levels (hypoglycemia) may indicate:
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
Many forms of severe stress (for example, trauma, stroke, heart attack, and surgery) can temporarily increase blood glucose levels.
Drugs that can increase glucose measurements include the following:
Drugs that can decrease glucose measurements include the following:
American Diabetes Association. Standards of medical care in diabetes -- 2009. Diabetes Care. 2009;32:S13-S61.
Inzucchi SE, Sherwin RS. Type 2 diabetes mellitus. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 248.
A blood glucose test measures the amount of a sugar called glucose in a sample of your blood.
Glucose is a major source of energy for most cells of the body, including those in the brain. Carbohydrates (or carbs) are found in fruit, cereal, bread, pasta, and rice. They are quickly turned into glucose in your body. This raises your blood glucose level.
See also:
Alternative NamesRandom blood sugar; Blood sugar level; Fasting blood sugar
How the test is performedA blood sample is needed. For information on how this is done, see: Venipuncture.
How to prepare for the testThe test may be done while you are fasting or at random.
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performedYour doctor may order this test if you have signs of diabetes. However, other tests (glucose tolerance test and fasting blood glucose test) are better for diagnosing diabetes.
The blood glucose test is also used to monitor patients who have the diabetes. It may also be done if you have:
Up to 100 milligrams per deciliter (mg/dL) is considered normal for a fasting blood glucose test.
Persons with levels between 100 and 125 mg/dL have impaired fasting glucose, a type of prediabetes. These levels are considered risk factors for type 2 diabetes and its complications.
Diabetes is diagnosed in persons with fasting blood glucose levels that are 126 mg/dL or higher.
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.
What abnormal results meanHigher-than-normal blood glucose levels (hyperglycemia) may be a sign of diabetes. In someone with diabetes, it may mean the diabetes is not well controlled.
Increased levels may also be due to:
Lower-than-normal levels (hypoglycemia) may be due to:
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
Many forms of severe stress (for example, trauma, stroke, heart attack, and surgery) can temporarily raise blood glucose levels.
Drugs that can increase glucose measurements include the following:
Drugs that can decrease glucose measurements include the following:
American Diabetes Association. Standards of medical care in diabetes -- 2011. Diabetes Care. 2011;32:S11-S61.
Inzucchi SE, Sherwin RS. Type 2 diabetes mellitus. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 248.
Reviewed ByReview Date: 05/22/2011
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The type of blood test that tests for levels of glucose in the blood
If you must test for cholesterol or glucose, you will. Otherwise, no.
A doctor will test your blood glucose (sugar) level by either extracting blood through a needle, or pricking your finger and placing blood on a test strip. The blood is then tested (read by a meter) to determine your sugar level. The test can often be read the same day. To achieve the best results, or the most accurate reading, it is recommended that you fast for 24 hours before a test is to be taken.
clinicik test
Glucose Bilirubin Ketones Specific Gravity Blood pH Protein Urobilinogen Nitrites Leukoytes
To test for the amount of sugars (glucose) in the blood.
bedside blood glucose test
Companies that manufacture blood glucose test strips are companies that specialize in manufacturing equipment for diabetes management. One touch manufactures blood glucose test strips.
The type of blood test that tests for levels of glucose in the blood
during the third triamester
Diabetes
A common test to diagnose hypoglycemia is the extended oral glucose tolerance test.
The two best diagnostic tools for discovering diabetes are blood glucose test and urinalysis. The blood glucose test measures the amount of glucose in the blood stream; the urinalysis measures ketones, a by-product of elevated glucose levels secreted from the kidneys.
Blood glucose tests require either whole blood, serum, or plasma collected by vein puncture or finger puncture. No special preparation is required for a casual blood glucose test.
The glucose tolerance test (GTT) measures the amount of blood sugar levels after the administration of glucose.
should I use blood glucose test daily if I have produce too much insulin
hematocrit or hemoglobin test