fasteglukos

Fasteglukos, or fasting glucose, is the concentration of glucose in the blood after at least eight hours without caloric intake. Measured as fasting plasma glucose (FPG), it is a common indicator of glycemic status and is used to screen for diabetes and prediabetes.

Measured from a venous blood sample, fasting glucose is reported in millimoles per litre (mmol/L) or milligrams per decilitre (mg/dL). Reference ranges vary by laboratory, but commonly: normal <5.6 mmol/L (100 mg/dL); impaired fasting glucose 5.6–6.9 mmol/L (100–125 mg/dL); diabetes ≥7.0 mmol/L (126 mg/dL) on two occasions. A diagnosis of diabetes generally requires confirmation by a second abnormal test or by using another test such as HbA1c or an oral glucose tolerance test.

Preparation and interpretation: The test requires fasting, typically overnight. Water is allowed; smoking and physical activity should be avoided before sampling per guidelines. Results can be influenced by acute illness, pregnancy, medications (for example corticosteroids), dehydration, and recent caffeine intake. Because of variability, clinicians often confirm abnormal results with a repeat test or use additional tests for comprehensive assessment.

Relation to other tests: FPG is one component of diabetes screening. The oral glucose tolerance test (OGTT) and HbA1c provide additional information. OGTT is more sensitive for diagnosing impaired glucose tolerance, while HbA1c reflects average glycemia over two to three months and is less affected by short-term fasting status.