Why Does My CGM Reading Differ from Fingerstick?

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This article provides general information about CGM and blood glucose monitoring. Always consult your healthcare provider for personalized medical advice. Medicare coverage rules may vary.

If you’ve noticed your CGM (Continuous Glucose Monitor) reading doesn’t match your fingerstick blood sugar test, you’re not alone. Many seniors ask about the cgm fingerstick difference and why these numbers don’t always align. Let’s explore this common concern with clear, easy-to-understand explanations.

Understanding Why CGM and Fingerstick Readings Differ

Think of your CGM and fingerstick meter as two different ways of checking your sugar levels – like having both a wall thermometer and an outdoor thermometer. They’re both correct, but they measure slightly different things.

Your CGM measures sugar in the fluid between your cells (interstitial fluid), while your fingerstick measures sugar directly in your blood. This key difference explains why readings often vary.

The Time Lag Explanation

When your blood sugar changes, it takes 10-15 minutes for those changes to show up in your interstitial fluid. This means your CGM reading can lag behind your fingerstick reading.

Think of it like this: If you turn up your home’s thermostat, the temperature doesn’t change instantly – it takes a few minutes. Your body works the same way with glucose changes.

When to Expect Different Readings

After eating (blood sugar rising quickly)
After taking insulin (blood sugar falling)
During exercise
When you’re dehydrated
First thing in the morning

What’s Considered a Normal Difference?

A difference of up to 20% between your CGM and fingerstick is generally acceptable. For example, if your fingerstick shows 100 mg/dL, your CGM might read anywhere between 80-120 mg/dL.

Medicare guidelines accept CGM accuracy within 20% of laboratory values for coverage purposes. Your device meets these requirements when properly used and calibrated.

When to Trust Which Reading

Trust Your Fingerstick When:

Your blood sugar is changing rapidly
Your CGM shows extreme numbers
You’re experiencing symptoms that don’t match your CGM
Your CGM sensor is new (first 24 hours)

[Content continues with practical tips, troubleshooting steps, and Medicare coverage details…]

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Need Help with Medicare CGM Coverage?

Our specialists can help you navigate Medicare requirements and get the supplies you need.

Call Now: 888-649-5705

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