what blood test detects diabetes
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How Is Diabetes Diagnosed? Fasting Plasma Glucose –This blood test is taken in the morning, on an empty stomach. A level of 126 mg/dl or above, on more than one occasion, indicates diabetes. Casual or Random Glucose - This blood test can be taken anytime during the day, without fasting. A glucose level of 200 mg/dl and above may suggest diabetes. If any of these test results occurs, testing should be repeated on a different day to confirm the diagnosis. If a casual plasma glucose equal to 200 mg/dl or above is detected, the confirming test used should be a fasting plasma glucose or an oral glucose tolerance test.
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Diagnosis 1 If it's 126 mg/dL (7 mmol/L) or higher on two separate tests, you have diabetes.  Oral glucose tolerance test. For this test, you fast overnight, and the fasting blood sugar level is measured. Then you drink a sugary liquid, and blood sugar levels are tested periodically for the next two hours. A blood sugar level less than 140 mg/dL (7.8 mmol/L) is normal. A reading of more than 200 mg/dL (11.1 mmol/L) after two hours indicates diabetes.
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- Laboratory Tests. In addition to diabetes tests listed above, used for screening, diagnosing and monitoring, a few other tests may be used in the evaluation of type 1 diabetes: Diabetes autoantibodies – this test may help distinguish between type 1 and type 2 diabetes if the diagnosis is unclear.
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Hemoglobin A1c The hemoglobin A1c test may be used to screen for and diagnose diabetes and prediabetes in adults. Hemoglobin A1c, also glycated hemoglobin or A1c, is formed in the blood when glucose attaches to hemoglobin.
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Diabetes (Type 1 and Type 2) If the result is abnormal, it is typically followed up with a fasting blood glucose test or a GTT. Glucose blood tests are also used to screen pregnant women for gestational diabetes between their 24th and 28th week of pregnancy. Fasting glucose (fasting blood glucose, FBG) – this test measures the level of glucose in the blood after fasting for at least 8 hours. 2  2-hour glucose tolerance test (GTT) – for this test, the person has a fasting glucose test done (see above), then drinks a 75-gram glucose drink.
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Understanding Diabetes -- Diagnosis and Treatment Getting diagnosed begins with one of three tests. in most cases, your doctor will want to repeat a test that is high in order to confirm the diagnosis: 1  A fasting glucose test is a test of your blood sugar levels taken in the morning before you have eaten. A level of 126 mg/dL or higher may mean that you have diabetes.
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- In this Article. 2 Tests to Measure Blood Sugar Control. To control your diabetes, you must know your blood sugar numbers. Testing your blood sugar is the only way to know whether your blood sugar is too high, too low, or just right. 1. The hemoglobin A1c test (pronounced he-me-glo-bin.
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Diagnosis of Diabetes Positive test results should be confirmed by repeating the fasting plasma glucose test or the oral glucose tolerance test on a different day. When first diagnosed with diabetes, your doctor may suggest a zinc transporter 8 autoantibody (ZnT8Ab) test. This blood test -- along with other information and test results -- can help determine if a person has type 1 diabetes and not another type.
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Diagnosis To diagnose type 1 diabetes, your doctor will ask for a: 1  Glycated hemoglobin (A1C) test. 2  This blood test indicates your average blood sugar level for the past two to three months. 3  It works by measuring the percentage of blood sugar attached to hemoglobin, the oxygen-carrying protein in red blood cells.
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Tests for Blood Sugar (Glucose) and HbA1c A blood sample is taken two hours later. Normally, your body should be able to deal with the glucose and your blood level should not go too high. A glucose level of 11.1 mmol/L or more in the blood sample taken after two hours indicates that you have diabetes. See separate leaflet called Glucose Tolerance Test for more details. The HbA1c blood test. If you have diabetes, your HbA1c level may be done every 2-6 months by your doctor or nurse.
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- Doctors use these tests to find out if you have diabetes: 1  Fasting plasma glucose test. 2  The doctor tests your blood sugar level after fasting for 8 hours and it’s higher than 126 mg/dL. 3  Oral glucose tolerance test. 4  After fasting for 8 hours, you get a special sugary drink.
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Diabetes: Checking Your Blood Sugar Diabetes: Checking Your Blood Sugar. Because you have diabetes, you need to know when your blood sugar level is outside the target range for your body. Fortunately, you can see what your blood sugar level is anywhere and anytime by using a home blood sugar meter (blood glucose meter).
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- Diabetes. Checking your insulin levels after a meal is a way to detect diabetes. Photo Credit Stockbyte/Stockbyte/Getty Images. Diabetes is a health condition that affects your body's production of insulin, which is needed to control your blood sugar levels.
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Diabetes Test Diabetes Test. Diabetes tests are the best way to determine whether you are at risk of developing type 2 diabetes or type 1 diabetes. There are several types of tests for diabetes including diabetes screening tests, C-peptide tests, oral glucose tolerance test, GAD antibody test and type 2 risk indicator tests.
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Diagnosis of Diabetes The following tests are used for the diagnosis of diabetes: A fasting plasma glucose test measures your blood glucose after you have gone at least 8 hours without eating. This test is used to detect diabetes or prediabetes.
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A1C Blood Test OK for Diabetes Diagnosis The test measures the percentage of glycated hemoglobin, or A1C, in the blood and provides an assessment of blood sugar levels over the previous two to three months. Hemoglobin is a protein on red blood cells that carries oxygen in the blood.
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Diabetes: Know Your Blood Sugar Numbers To control your diabetes, you must know your blood sugar numbers. Testing your blood sugar is the only way to know whether your blood sugar is too high, too low, or just right. 1. The hemoglobin A1c test (pronounced he-me-glo-bin.
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High Blood Sugar, Diabetes, and Your Body Doctors use these tests to find out if you have diabetes: 1  Fasting plasma glucose test. 2  The doctor tests your blood sugar level after fasting for 8 hours and it’s higher than 126 mg/dL. 3  Oral glucose tolerance test.
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Diabetes Tests & Diagnosis For diagnosing gestational diabetes, you will need your blood drawn every hour for 2 to 3 hours. High blood glucose levels at any two or more blood test times during the OGTT—fasting, 1 hour, 2 hours, or 3 hours—mean you have gestational diabetes. Your health care team will explain what your OGTT results mean.
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Diabetes Testing To confirm the diagnosis of type 2 diabetes, your doctor will order a fasting plasma glucose test or a casual plasma glucose.
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- Most children with diabetes detected because of symptoms have a blood glucose level of at least 250 mg/dL (14 mmol/L). Blood glucose tests using capillary blood samples, reagent sticks, and blood glucose meters are the usual methods for monitoring day-to-day diabetes control.
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- A glucose tolerance test is a common type of testing for potential gestational diabetes. There are several tests intended to identify gestational diabetes in pregnant women. The first, called the Glucose Challenge Screening, is a preliminary screening test performed between 26-28 weeks.
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Glucose Test If you had a fasting blood glucose test: 1  A level of 100 to 125 mg/dL (5.6 to 6.9 mmol/L) means you have impaired fasting glucose, a type of prediabetes. This increases your risk of developing type 2 diabetes. 2  A level of 126 mg/dL (7 mmol/L) and higher usually means you have diabetes.
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- Diabetes is diagnosed by any one of the following: 1  Two consecutive fasting blood glucose tests that are equal to or greater than 126 mg/dL. 2  Any random blood glucose that is greater than 200 mg/dL. 3  An A1c test that is equal to or greater than 6.5 percent. A1c is an easy blood test that gives a three month average of blood sugars.