CDCES CDCES Diabetes Technology and Devices 1 — Questions and Answers
Question 1: What does CGM stand for in diabetes management?
- Continuous Glucose Monitoring (Correct answer)
- Calibrated Glucometer Measurement
- Controlled Glycemic Management
- Centralized Glucose Mapping
Correct answer: Continuous Glucose Monitoring
CGM stands for Continuous Glucose Monitoring, a technology that measures interstitial glucose levels automatically at regular intervals throughout the day and night.
Question 2: What is the typical lag time between blood glucose and interstitial glucose readings on a CGM device?
- 0–1 minute
- 5–15 minutes (Correct answer)
- 30–60 minutes
- 2–4 hours
Correct answer: 5–15 minutes
There is typically a 5–15 minute physiological lag between blood glucose and interstitial glucose, which is important when making rapid treatment decisions.
Question 3: Which CGM metric best reflects overall glycemic control over a given time period, analogous to A1C but derived from CGM data?
- Time in range (TIR)
- Glucose management indicator (GMI) (Correct answer)
- Mean amplitude of glycemic excursions (MAGE)
- Standard deviation of glucose
Correct answer: Glucose management indicator (GMI)
The Glucose Management Indicator (GMI) is calculated from CGM mean glucose and approximates the expected A1C level based on sensor glucose data.
Question 4: What is the ADA-recommended target for 'Time in Range' (70–180 mg/dL) for most adults with type 1 or type 2 diabetes?
- Greater than 50%
- Greater than 70% (Correct answer)
- Greater than 85%
- Greater than 95%
Correct answer: Greater than 70%
The ADA recommends a Time in Range target of greater than 70% (approximately 17 hours per day) for most adults with type 1 or type 2 diabetes.
Question 5: When educating a patient new to CGM, which instruction is most important regarding sensor calibration for devices that require it?
- Calibrate only when the glucose arrow is pointing up
- Calibrate during periods of rapid glucose change for accuracy
- Use fingerstick blood glucose values during stable glucose periods for calibration (Correct answer)
- Calibrate immediately after eating a meal
Correct answer: Use fingerstick blood glucose values during stable glucose periods for calibration
For CGM devices requiring calibration, fingerstick values should be entered during periods of stable glucose (not rapid change) to maximize sensor accuracy.
Question 6: Which condition can falsely lower CGM sensor glucose readings in some older-generation devices?
- High ambient temperature
- Acetaminophen (paracetamol) ingestion (Correct answer)
- Vitamin D supplementation
- High altitude
Correct answer: Acetaminophen (paracetamol) ingestion
Acetaminophen can interfere with electrochemical CGM sensors and falsely lower readings in some older devices, though newer sensors are less susceptible.
CDCES CDCES Diabetes Technology and Devices 1
What does CGM stand for in diabetes management?