As there is no clear-cut guidelines for when to screen for diabetes, experts from the American Diabetes Association (ADA) always recommend all adults should have routine diabetes screening starting at age 45, or younger if at high risk. It is important that diabetes is diagnosed as early as possible so that the treatment can be started as fast as possible.
Blood samples drawing and glucose level within the blood measuring are the most common tests for diabetes. Testing may be done when the symptoms suggest the presence of diabetes or as a screening exam to detect unrecognized diabetes. The followings are tests available for diagnosing Type 2 Diabetes:
Random Blood Glucose
The Random Blood Glucose Test can be done at any time to measure the blood sugar levels. It is not accurate enough to diagnose diabetes, but it is indicative of diabetes if the blood sugar level of the patient is at least 200mg/dL associated with typical symptoms of diabetes. These symptoms can be “Excessive thirst”, “Frequent Urination”, “Weight loss or gain” and “Increased fatigue”.
A repeat test should be taken to confirm the results since there is a 40% risk of developing diabetes within 5 years in those people whose results indicate pre-diabetes if they do not improve their lifestyle and health.
Fasting Plasma Glucose Test
The fasting Plasma Glucose (FPG) test is the standard test for diabetes. A blood sample is obtained after eight hours of fasting. The blood is usually drawn in the morning before breakfast. The test can help diagnose diabetes and pre-diabetes which is a situation in which your glucose levels are high but not at a diagnostic level. According to the ADA, FPG levels are considered as normal up to 100mg/dL. Diabetes is diagnosed when the blood sugar is 126mg/dL or higher. Levels between 100mg/dL and 125mg/dL are referred to as impaired fasting glucose or pre-diabetes. These levels are considered to be risk factors for Type 2 Diabetes.
The fasting Plasma Glucose (FPG) test is the standard test for diabetes. A blood sample is obtained after eight hours of fasting. The blood is usually drawn in the morning before breakfast. The test can help diagnose diabetes and pre-diabetes which is a situation in which your glucose levels are high but not at a diagnostic level. According to the ADA, FPG levels are considered as normal up to 100mg/dL. Diabetes is diagnosed when the blood sugar is 126mg/dL or higher. Levels between 100mg/dL and 125mg/dL are referred to as impaired fasting glucose or pre-diabetes. These levels are considered to be risk factors for Type 2 Diabetes.
Although FPG test is the most common test used to diagnose diabetes, it is not always reliable. Therefore, a repeat test is recommended if there is presence of diabetes suggested in the initial test. People with FPG levels in high end of the normal range have a greater risk to develop Type 2 Diabetes.
Oral Glucose Tolerance Test
The Oral Glucose Tolerance Test (OGTT) is more complex than the FPG and may over-diagnose diabetes in people who do not have it. It is suggested that to take this test as a follow-up after FPG when the patients have symptoms or risk factors of diabetes with a normal result in the FPG test or other tests. A blood sample will be taken every 30 minutes for the next two hours after drinking a sweet sugary beverage containing 75mg of glucose. It is considered as normal when the OGTT level is below 140mg/dL. Diabetes is diagnosed when the OGTT levels are over 200mg/dL or higher. OGTT levels between 140mg/dL and 199mg/dL are indicated impaired glucose tolerance or pre-diabetes.
The Oral Glucose Tolerance Test (OGTT) is more complex than the FPG and may over-diagnose diabetes in people who do not have it. It is suggested that to take this test as a follow-up after FPG when the patients have symptoms or risk factors of diabetes with a normal result in the FPG test or other tests. A blood sample will be taken every 30 minutes for the next two hours after drinking a sweet sugary beverage containing 75mg of glucose. It is considered as normal when the OGTT level is below 140mg/dL. Diabetes is diagnosed when the OGTT levels are over 200mg/dL or higher. OGTT levels between 140mg/dL and 199mg/dL are indicated impaired glucose tolerance or pre-diabetes.
The A1C Test
A1C test is another test of blood glucose test used to diagnose Type 2 Diabetes. This test is used to test for blood levels of glycosylated hemoglobin. It is not used for initial diagnosis but it is useful for determining the severity of diabetes. Some experts stated that A1C is a good indicator of the blood glucose levels and it can help predict complications in people who have FPG levels of 110mg/dL to 139mg/dL. It is recommended that people with diabetes should take the A1C test at least twice a year because it is the best measure of blood glucose control.
A1C test is another test of blood glucose test used to diagnose Type 2 Diabetes. This test is used to test for blood levels of glycosylated hemoglobin. It is not used for initial diagnosis but it is useful for determining the severity of diabetes. Some experts stated that A1C is a good indicator of the blood glucose levels and it can help predict complications in people who have FPG levels of 110mg/dL to 139mg/dL. It is recommended that people with diabetes should take the A1C test at least twice a year because it is the best measure of blood glucose control.