The NIDDK warns that blood samples taken at home or analyzed in a healthcare provider’s office should not be used for diagnosis. Doctors should be aware of laboratories that use an NGSP-certified method of testing for A1C levels. Strict quality controls and advancements in testing have made the A1C test more precise than in the past, according to the NIDDK. Testing environments, such as temperature in the lab, equipment used, and handling of samples, can affect the results however, this is more common in the fasting plasma glucose and the OGTT than in the A1C. Sometimes, however, in the early stages of diabetes, blood sugar levels are not high enough to show up as problematic. How accurate are A1C tests?Ī1C levels rise well before the clinical onset of diabetes, making early diagnosis possible according to the 2017 Standards of Medical Care in Diabetes by the American Diabetes Association (ADA). If the results are borderline or if the results of the different tests do not match, a doctor might suggest repeating the test in several weeks or months. Another test, the random plasma glucose test, which does not require fasting, can also be used. If A1C test results indicate a person has or might have diabetes, a healthcare provider might suggest one of these tests to confirm the results. Unlike the fasting plasma glucose (FPG) and the OGTT tests, there is no need to fast before having the A1C test. Do you have to fast for an A1C blood test? The A1C blood test is not for diagnosing Type 1 diabetes, gestational diabetes, or cystic fibrosis-related diabetes, according to the National Institute of Diabetes and Digestive and Kidney Diseases ( NIDDK ).
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