A normal glucose meter reading is 100 mg/dL or less after 8 hours of fasting, or 140/120 mg/dL or less at 2 hours after a meal for those under 50 years old, notes WebMD. Normal levels for random glucose testing range between 70-125 mg/dL, according to Healthline.
Note that ranges are given rather than an exact number. A single reading that is either below range or above range on a home glucose meter is not necessarily a negative. Home glucose meters are often not as accurate as hospital-grade devices. Several readings outside the range require a doctor's visit. The doctor's office can test blood sugar levels on both the home device and office device to determine accuracy and any need for additional blood sugar tests.