FGM is a method for measuring glucose levels using a sensor placed under the skin. It records glucose levels in the interstitial fluid every 15 minutes, allowing you to check your glucose without the need for finger-pricking.
For those new to FGM, here are some strategies to effectively utilise this technology:
1. Regular scanning
Regularly scanning your glucose levels, at least once every eight hours, helps identify patterns and informs necessary adjustments for optimal glucose control.
Suggested timings for scanning:
Tips:
FGM readings may differ from finger-prick tests, especially when glucose levels are rapidly changing. If FGM readings do not align with your symptoms, perform a finger-prick test for confirmation.
2. Understanding blood glucose targets
Discuss and establish glucose targets with your healthcare team. The aim is to maintain glucose levels within these targets as consistently as possible.
An example of glucose targets:
| Before a meal | 2 hours after a meal |
|---|---|
| 4-7 mmol/L | Less then 10 mmol/L |
Tips:
Modify food intake, physical activity or diabetes medications in response to glucose levels outside your target range. Consult your healthcare team for guidance.
3. Interpreting trend arrows
Trend arrows on the FGM display provide insights into the direction of your glucose level changes.
| Arrows | What it means |
|---|---|
 | Glucose is rising quickly |
 | Glucose is falling quickly |
 | Glucose is stable |
Keep a Diary
Time in Range (TIR)
TIR indicates the percentage of time your glucose levels remain within your target range. Work with your healthcare team to set a TIR goal as a measurable objective.
For a target glucose range of 4-10mmol/L, the aim might be to spend over 70% of time within this range and less then 5% below 4 mmol/L.
| Range | Glucose Level | Target |
|---|---|---|
| Time Above Range | Above 10 mmol/L | Less than 25% |
| Time In Range | 4 - 10 mmol/L | Above 70% |
| Time Below Range | Below 4 mmol/L | Less than 5% |
Tip:
Work towards improving Time In Range incrementally, for example, by 5% at a time.
Daily Patterns
The daily pattern graph provides insights into how your glucose levels fluctuate during the day. Identify times when you are more likely to experience low or high glucose levels, as well as periods when levels are within the target range.
Reflect on:
Food
Exercise
Medication
Images credit: Abbott, Health Promotion Board, Vectorstock
