A glucose test is a medical procedure used to measure the level of glucose (sugar) in the blood. It helps diagnose conditions like diabetes and monitor blood sugar levels in individuals with the disease. The test can be performed after fasting or at random times, depending on the specific type of test being conducted. During the test, a healthcare professional will take a blood sample, usually from a vein in the arm or a finger prick. The results indicate how well the body is managing glucose, providing essential information for treatment and lifestyle adjustments if necessary.