There are 4 main ways to check blood sugar: finger-prick testing with a glucose meter, continuous glucose monitoring, flash glucose monitoring, and lab tests such as A1C or fasting blood sugar. Home monitoring usually means a meter or sensor, while clinic testing is used to diagnose or assess longer- term control.

Quick Scoop

  • Finger-prick glucose meter: a small blood sample from your fingertip gives an instant reading. This is the most common at-home method.
  • Continuous glucose monitor (CGM): a wearable sensor checks glucose regularly throughout the day and can alert you to highs or lows.
  • Flash glucose monitoring: similar to CGM, but you usually scan the sensor to see the reading rather than getting automatic alerts.
  • Lab tests: A1C, fasting blood sugar, glucose tolerance, and random blood sugar tests are used in clinics to diagnose or assess diabetes.

What each one is for

  • Daily management: finger-prick meters, CGMs, and flash monitors.
  • Diagnosis or medical review: A1C, fasting blood sugar, glucose tolerance, and random blood sugar tests.
  • Long-term control: A1C shows your average blood sugar over about 2 to 3 months.
  • Short-term readings: finger-prick, CGM, and flash monitoring show current or near-current glucose levels.

Simple rule of thumb

If you mean at-home checking , the answer is usually 3 ways : finger- prick meter, CGM, and flash monitoring. If you include medical tests , it becomes 7 common ways in total.

Safety note

For any blood sugar concern, the right method depends on your condition, symptoms, and your doctor’s advice. If you have symptoms of very low or very high blood sugar, use the method your care team recommended and seek medical help if needed.