HbA1C (A1C or glycosylated hemoglobin test)
1 One hour later, you'll have a blood test to measure your blood sugar level. 2  A blood sugar level below 140 mg/dL (7.2 to 7.8 mmol/L) is usually considered normal on a glucose challenge test, although this may vary at specific clinics or labs. 1 Random blood sugar test. 2  A blood sample will be taken at a random time. 3  Regardless of when you last ate, a random blood sugar level of 200 milligrams per deciliter (mg/dL) — 11.1 millimoles per liter (mmol/L) — or higher suggests diabetes. This test checks your fasting blood glucose levels. Fasting means after not having anything to eat or drink (except water) for at least 8 hours before the test. This test is usually done first thing in the morning, before breakfast. 1  Diabetes is diagnosed at fasting blood glucose of greater than or equal to 126 mg/dl. Testing should be carried out in a health care setting (such as your doctor’s office or a lab). If your doctor determines that your blood glucose level is very high, or if you have classic symptoms of high blood glucose in addition to one positive test, your doctor may not require a second test to diagnose diabetes. 1 A fasting blood sugar level less than 100 mg/dL (5.6 mmol/L) is normal. 2  A fasting blood sugar level from 100 to 125 mg/dL (5.6 to 6.9 mmol/L) is considered prediabetes. 3  If it's 126 mg/dL (7 mmol/L) or higher on two separate tests, you have diabetes. 4  Oral glucose tolerance test. 1 Random blood sugar test. 2  A blood sample will be taken at a random time. 3  Regardless of when you last ate, a random blood sugar level of 200 milligrams per deciliter (mg/dL) — 11.1 millimoles per liter (mmol/L) — or higher suggests diabetes. The OGTT is a two-hour test that checks your blood glucose levels before and 2 hours after you drink a special sweet drink. It tells the doctor how your body processes glucose. 1  Diabetes is diagnosed at 2 hour blood glucose of greater than or equal to 200 mg/dl. Testing should be carried out in a health care setting (such as your doctor’s office or a lab). If your doctor determines that your blood glucose level is very high, or if you have classic symptoms of high blood glucose in addition to one positive test, your doctor may not require a second test to diagnose diabetes. 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. If the A1C test isn't available, or if you have certain conditions that can make the A1C test inaccurate — such as if you're pregnant or have an uncommon form of hemoglobin (known as a hemoglobin variant) — your doctor may use the following tests to diagnose diabetes: 1  Random blood sugar test. 2  Fasting If you receive a diagnosis of diabetes, your doctor will also run blood tests to check for autoantibodies that are common in type 1 diabetes. These tests help your doctor distinguish between type 1 and type 2 diabetes. If the A1C test isn't available, or if you have certain conditions that can make the A1C test inaccurate — such as if you're pregnant or have an uncommon form of hemoglobin (known as a hemoglobin variant) — your doctor may use the following tests to diagnose diabetes: 1  Random blood sugar test. 2  Fasting Tests for type 1 and type 2 diabetes and prediabetes. 1  Glycated hemoglobin (A1C) test. 2  This blood test indicates your average blood sugar level for the past two to three months. 3  It measures the percentage of blood sugar attached to hemoglobin, the oxygen-carrying protein in red blood cells. 1 Random blood sugar test. 2  A blood sample will be taken at a random time. 3  Regardless of when you last ate, a random blood sugar level of 200 milligrams per deciliter (mg/dL) — 11.1 millimoles per liter (mmol/L) — or higher suggests diabetes. HbA1C (A1C or glycosylated hemoglobin test) If diagnosed with type 2 diabetes, your health care provider will regularly run a test called HbA1c (A1C or glycosylated hemoglobin test). An A1C test provides a picture of your average blood sugar control for the past two to three months. If your blood glucose levels are in normal range, testing should be done about every three years. If you have prediabetes, you should be checked for diabetes every one to two years after diagnosis. Tests for Diagnosing Prediabetes and Diabetes. HbA1C (A1C or glycosylated hemoglobin test) The A1C can be used for the diagnosis of both prediabetes and diabetes. The A1C test measures your average blood glucose control for the past 2 to 3 months. This test is more convenient because no fasting is required. An A1C of 5.7% to 6.4% means that you are at high risk for the development of diabetes and you have prediabetes. If your blood glucose levels are in normal range, testing should be done about every three years. If you have prediabetes, you should be checked for diabetes every one to two years after diagnosis. Tests for Diagnosing Prediabetes and Diabetes.
http://www.mayoclinic.org/diseases-conditions/diabetes/basics/tests-diagnosis/CON-20033091 http://www.diabetes.org/diabetes-basics/diagnosis/ http://www.mayoclinic.org/diseases-conditions/diabetes/basics/tests-diagnosis/CON-20033091 http://www.diabetes.org/diabetes-basics/diagnosis/ http://www.mayoclinic.org/diseases-conditions/type-1-diabetes/basics/tests-diagnosis/CON-20019573 http://www.mayoclinic.org/diseases-conditions/type-1-diabetes/basics/tests-diagnosis/CON-20019573 http://www.mayoclinic.org/diseases-conditions/diabetes/basics/tests-diagnosis/CON-20033091 http://www.heart.org/HEARTORG/Conditions/Diabetes/SymptomsDiagnosisMonitoringofDiabetes/Symptoms-Diagnosis-Monitoring-of-Diabetes_UCM_002035_Article.jsp http://www.heart.org/HEARTORG/Conditions/Diabetes/SymptomsDiagnosisMonitoringofDiabetes/Symptoms-Diagnosis-Monitoring-of-Diabetes_UCM_002035_Article.jsp
what blood test is done to check for diabetes