Getting two different readings can definitely be confusing and a little unsettling! The Dexcom is a CGM (Continuous Glucose Monitor), and while it's a helpful tool, it measures glucose differently than a traditional fingerstick meter — so some variation between the two is normal.
A few things that can cause differences in Show Full Answer
Getting two different readings can definitely be confusing and a little unsettling! The Dexcom is a CGM (Continuous Glucose Monitor), and while it's a helpful tool, it measures glucose differently than a traditional fingerstick meter — so some variation between the two is normal.
A few things that can cause differences in readings include:
- How CGMs work — they measure glucose in the fluid around your cells, not directly from your blood, so there can be a slight lag compared to a fingerstick reading
- Calibration — some CGMs need to be calibrated using a traditional glucose meter to stay accurate
- The brand and situation — accuracy can vary depending on conditions To get the most reliable readings, here are some helpful tips:
- Wash and dry your hands before any fingerstick test
- Make sure your meter and test strips are stored properly and not expired
- Compare your CGM reading with a lab test from time to time
- Bring your meter to your next doctor's appointment so they can check your technique
If the readings are very different or don't match how you're feeling, it's always a good idea to do a fingerstick check and contact your doctor if you're still unsure. When in doubt, retest!
June 3
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