The Fasting Plasma Glucose test is the primary, gold-standard screening test for diabetes and pre-diabetes. It measures the amount of glucose (sugar) in your blood after a period of fasting, typically 8 to 12 hours. This test provides a clear picture of your baseline blood sugar level, without the influence of a recent meal. It is a core part of every adult wellness check. A simple blood draw is all that's needed. This is a routine yet vital check. Early detection of high blood sugar allows for timely, life-changing intervention.