The Insulin Random test is a powerful diagnostic tool for investigating hypoglycemia (low blood sugar). It measures your insulin level at the exact moment you are having symptoms (like shakiness, dizziness, or confusion). This test is critical: your insulin level should be low when your blood sugar is low. If your insulin is high, it's a definitive clue for your doctor to diagnose the cause. This test provides the immediate, in-the-moment data your doctor needs to solve the puzzle of your symptoms.