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The disadvantages of fasting plasma glucose as a diagnostic test for type ii diabetes the fasting plasma glucose test has several disadvantages many of which contributed to the nzssd and who decisions to recommend that hba 1c be used as the preferred test for the diagnosis of type ii diabetes1 6. The diagnostic range of fasting plasma glucose is narrow compared with the biological variation between individuals when tested with fasting glucose which is approximately 45 14 this means that if a group of patients have a fasting plasma glucose level of 70 mmol l most will have an actual value between 67 73 mmol l 45 biological . Impaired fasting glycemia ifg may also be known as pre diabetes or metabolic syndrome impaired fasting glycemia occurs when blood glucose levels in the body are elevated during periods of fasting but not enough to prompt a diagnosis of diabetes effectively a person with impaired fasting glycemia isnt able to process glucose as efficiently as they should be able to. Impaired fasting glucose is a condition in which the levels of sugars in the blood is way above the normal levels in the fasting stage but they are not high enough to be termed as diabetes this condition is also termed as prediabetes know the causes symptoms treatment and prevention of impaired fasting glucose