Blood Glucose Testing refers to the medical diagnostic procedure used to measure the concentration of glucose (sugar) in the bloodstream at a specific moment in time. This test is crucial for the diagnosis, monitoring, and management of diabetes mellitus and related metabolic conditions.

The testing is most commonly performed using portable Blood Glucose Monitoring Systems (BGMS), where a small drop of capillary blood is applied to a disposable test strip for immediate results (self-monitoring of blood glucose, or SMBG). Regular testing enables individuals and healthcare providers to track blood sugar trends, make timely adjustments to diet, physical activity, and medication (like insulin), and effectively prevent acute complications such as hypoglycemia and hyperglycemia.