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A sensor-augmented insulin pump or a CGM monitor uses blood glucose (BG) readings to make sure the glucose sensor maintains its accuracy over time. This is called calibration.
To calibrate you must check your BG on your meter and enter the value into your pump.
Selecting The Best Sensor Site
Locations for Inserting Glucose Sensors
Note
Clinical trials of sensor accuracy have been based on sensors inserted in the belly area. Sensor performance may differ when other insertion sites are used.
Glucose Sensor Insertion Site Guidelines
Avoid inserting the sensor:
Into the 2-inch (5.0 cm) area around your belly button
Where your body naturally bends a great deal
In areas where clothing might cause irritation (for example your beltline)
Where you have scarred or hardened tissue or stretch marks
Your sensor should be at least:
2 inches (5.0 cm) away from your insulin pump infusion site
3 inches (7.5 cm) away from any manual insulin injection site
2 inches (5.0 cm) away from your belly button
2 inches (5.0 cm) away from the previous site
Storing Glucose Sensors
Glucose sensors can be stored at room temperature between +36°F to +80°F (+2°C to +27°C).
For temperatures greater than +80°F (+27°C), sensors will require cooled storage (such as in an ice chest or refrigerator) at temperatures not lower than +36°F (+2°C). Prior to using a sensor stored in a cool environment, allow the sensor package to warm up to room temperature for about 15 minutes before opening the sensor package to prevent condensation.
Warning
Do not freeze the sensor. Sensors should not be stored in direct sunlight, extreme temperatures, or humidity.
Changing Your Sensor
Important
This information is provided for review purposes only (after you have attended initial training with your certified trainer or healthcare professional).
Using the Sof-sensor & Revel (523/723) Insulin Pump
Note
To hear the instructions on these support videos, be sure the sound on your computer is turned on.
Important Reminders for Success
| Glucose Sensor | Important Reminders for Success | Picture |
|---|---|---|
| Sof-sensor | Tip: Insert the sensor anywhere between a 45 and 60 degree angle. Reason: Proper angle of insertion is essential to good sensor performance. | |
| Tip: Remove the needle at the same angle it was inserted. Reason: Removing the needle at a different angle may damage the sensor. |
Best Times To Calibrate
The best times to calibrate are when glucose levels are least likely to be changing rapidly. Think Before:
- Before meals
- Before bedtime
- Before insulin
- When there are no arrows on your insulin pump screen
Important
Always rely on BG meter readings for therapy adjustments.
Your blood glucose (BG) meter measures glucose levels in your blood, and your glucose sensor measures glucose levels in the fluid surrounding the cells in your tissue, which is called interstitial fluid.
Most of the time, glucose travels first to your blood and then to your interstitial fluid. Because of how glucose travels, your BG meter readings and sensor glucose readings will rarely match exactly. This is normal and should be expected.
Important
Focus on what matters: the direction and the speed of the sensor glucose change. Pay less attention to each individual glucose number and more attention to the trends.
Usually your BG meter readings and your sensor readings will be close. However, when glucose levels are rising or falling quickly, you should expect to see a larger difference between your BG meter value and the sensor glucose reading. Examples of times when this may occur include:
After meals or after bolus insulin
When UP or DOWN arrows appear on your device screen