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Accuracy and calibration
Issue
Why aren't your BG meter value and sensor reading the exact same number?
Solution
Accuracy
One reason is they're measuring glucose in different fluids. The BG meter measures
blood glucose while the sensor measures interstitial fluid. And if your healthcare
provider did a lab test at the same time, the lab result may give a third number. The
lab test is considered the most accurate number.
Other reasons there could be a difference between your BG meter and your Dexcom
G7 are:
Hand cleanliness: Wash your hands with soap and water (not hand sanitizer) and
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dry them. Then test. Many inaccurate BG meter values are from hands not being
washed thoroughly before testing.
Sensor's first day: With newly inserted sensors, the differences between your BG
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meter and the sensor reading may be greater. Generally, the numbers get closer
over the first 24 hours.
Pressure on sensor: Sometimes when something is pressing on your sensor, for
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example, if you're lying on it, it can affect your sensor readings. Relieve the
pressure and the numbers should get closer.
Glucose changing quickly: When your glucose is rapidly changing, it can be
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more difficult to compare your BG meter value and sensor reading because blood
glucose changes a little before interstitial fluid glucose. The numbers should get
closer when your glucose stabilizes.
Test strips: Make sure your test strips are stored as directed and not expired.
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Also, make sure to use enough blood on the test strip.
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Table of Contents
Need help?
Do you have a question about the G7 and is the answer not in the manual?
Questions and answers
changed sensor, it paired but get a message sensor failed start new sensor
The Dexcom G7 sensor may show a failure message after pairing due to issues such as using an outdated sensor version that is not compatible with certain devices, signal loss, or sensor adhesion problems. If pairing with a Tandem hybrid closed-loop system, an older Dexcom T7 version may cause an error message like "sensor not started 43t." Checking the sensor's LBL number and ensuring compatibility can help resolve the issue. If the problem persists, contacting Dexcom for a replacement may be necessary.
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How long after eating does readings reach the sensor?
The Dexcom G7 sensor measures glucose in interstitial fluid, not blood, and glucose levels in interstitial fluid can lag behind blood glucose levels, especially when glucose is changing rapidly. This means that after eating, the sensor reading may take some time to reflect actual blood glucose changes. The exact time can vary, but differences are more noticeable when glucose levels are rising or falling quickly.
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Wait time between showing & inserting new G7 sensor
The Dexcom G7 sensor has a 12-hour grace period at the end of its session, allowing time to replace the sensor. After inserting a new sensor, there is a sensor warm-up period before readings and alerts begin.
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Power off is where
The power off button on the Dexcom G7 receiver is the right button with a circle on it, also known as the Select button.
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How to change zone settings in G7 on Android phone app?