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Impact of Sensor Site Selection
Choosing the right sensor site affects CGM accuracy, comfort, and longevity—consider blood flow, activity level, and skin condition.
Reviewed by CGM AFIA Editorial Team. Last reviewed: 2026-01-24.
Author: CGM AFIA Editorial Team
Part of: Interpreting Trend Arrows
Why Site Selection Matters
Selecting the right [sensor site](/glossary/#term-sensor-site) is crucial for:
- Accurate glucose readings
- Comfortable wear
- Sensor longevity
- Consistent performance
Optimal Site Characteristics
Blood Flow
Choose areas with good blood flow for faster, more accurate readings.
Recommended Areas
- Abdomen: High blood flow, easy access
- Upper buttocks: Good for active individuals
- Back of upper arm: Discrete location
Areas to Avoid
Structural Issues
- Scarring: Impaired glucose diffusion
- Tattoos: May interfere with sensor function
- Lipohypertrophy: Reduced accuracy
Activity-Related
- Belt lines or waistbands
- Areas compressed during sleep
- High-friction areas during exercise
Site-Specific Considerations
Abdomen
- Most common site
- Good visibility for insertion
- May be affected by sit-ups or core exercises
Upper Arm
- Discrete
- Good for swimmers
- May require assistance for insertion
Upper Buttocks
- Protected from most activities
- Harder to monitor visually
- Good accuracy in studies
Maximizing Accuracy
- Rotate sites regularly
- Keep a site log
- Note which sites give best results for you
- Consider your lifestyle and activities