User guide
Table Of Contents
- Contents
- Introduction
- The basics
- Entering your settings
- Basic steps
- Setting the time and date
- Selecting the language
- Setting your Alarm/Alert Type
- Entering your glucose monitoring settings
- Turning on the sensor
- Selecting the BG units
- Turning on the Glucose Alerts
- Setting the Glucose Limits
- Setting the Glucose Limits start time
- Setting the High Snooze
- Setting the Low Snooze
- Setting the Predictive glucose alert
- Setting the Rate Alerts
- AUC calculation
- Setting the Alarm Snooze
- Setting the Cal Reminder
- Entering the transmitter identification number
- Setting up the Missed Data option
- Setting the sensor glucose graph timeout
- Reviewing your settings
- Setting up your transmitter and sensor
- Meter option
- Using your system
- Utilities
- Therapy management software
- Troubleshooting and alarms/alerts
- About alarms and alerts
- What to do when you get an alarm/alert
- Sensor alerts
- Viewing your sensor alert history
- System alarms
- Viewing your system alarm history
- Understanding your transmitter, tester, and charger
- Troubleshooting the transmitter
- Troubleshooting the monitor
- My monitor will not display my BG measurement from my meter
- Reconnect old sensor
- Find lost sensor
- What happens if I leave the monitor battery out for more than ten minutes?
- Why doesn't my monitor battery last very long?
- What is a CHECK SETTINGS alarm?
- My screen looks distorted
- I dropped my monitor
- I submerged my monitor in water
- I cannot get to the User Settings screen
- System maintenance
- System specifications
- Alarm/alert types
- Alarm/alert messages and codes
- Alarm/alert history
- Backlight
- Screen and menu timeout
- Sensor glucose graph timeout
- High and low Glucose Limits (CSS7100)
- High and low Glucose Limits (CSS7100K)
- Daily totals
- Default screen
- Default settings
- ENTER BG meter values
- Meter ID entries
- Power supply
- System safety checks
- Radio frequency (RF) communication specifications
- Quality of service
- Data security
- Monitor size
- Monitor weight
- TIME/DATE SET screen
- STATUS screen
- Guidance and manufacturer's declaration
- MiniLink specifications
- Warranty
- Icon table
- Sensor accuracy
- Performance results in adults
- Accuracy of Guardian RT readings
- Precision of Guardian RT readings
- Low and High Alerts in adults
- Guardian RT Sensor Performance and Calibration Stability As a Function of Time
- Effects of calibration frequency
- Performance results in children and adolescents
- Low and High alerts in children and adolescents
- Glossary
- Index
The Low Glucose Alert
The Low Glucose Alert was evaluated for its ability to detect glucose levels at 70 mg/dL (3.9 mmol/L), or
below, using the YSI 2300 STAT Plus glucose analyzer. As a reference, with the Low Glucose Alert set at
70 mg/dL (3.9 mmol/L), 49% (100/205) of low glucose events were detected by the Guardian RT. Better
detection of low blood glucose can be obtained by setting the Low Glucose Alert level higher. For
example, setting the Low Glucose Alert at 90 mg/dL (5.0 mmol/L), instead of 70 mg/dL (3.9 mmol/L),
increases the ability to detect low blood glucose levels from 49% to 82% (see the following table).
Sometimes the Guardian RT will alert when the blood glucose levels are not low. When the Guardian RT
Low Alert was set at 70 mg/dL (3.9 mmol/L) in this study, 43% of the results were considered false alerts
(actual blood glucose values are greater than 85 mg/dL (4.7 mmol/L)). This percentage may be
exaggerated because blood glucose may be dropping when the Guardian RT alerts. The table below shows
the percent of Low Glucose readings correctly identified by the Guardian RT for specific settings.
Guardian RT Low Alert
Setting (mg/dL)
Guardian RT Low Alert
Setting (mmol/L)
True Alert Rate
a
False Alert Rate
b
70 3.9 49% 60%
80 4.4 68% 64%
90 5.0 82% 75%
100 5.6 90% 79%
a. True Alert Rates are the % of times when the glucose level was at or below the alert setting and the alert sounded.
b. False Alerts Rates are the % of times when the Guardian RT Sensor alarmed but the blood glucose level was greater
than the alert setting.
Increasing the Low Alert settings will improve the ability to detect low blood glucose events, but it will
also increase the frequency of Guardian RT false alerts for blood glucose levels not below the target value.
You should consider this trade-off between the improved ability to detect true low blood glucose versus
the increased number of false alerts when setting the low alert threshold.
The High Glucose Alert
The High Glucose Alert was evaluated for its ability to detect glucose levels at 250 mg/dL (13.8 mmol/L),
or above, using the YSI analyzer. As a reference, with the High Glucose Alert set at 250 mg/dL (13.8
mmol/L), 53% (195/365) of high glucose events were detected by the Guardian RT. Better detection of
Appendix A140