Understanding Glucose Readings

When you open LibreLinkUp, you will see the latest glucose reading from your connections, the time the reading was taken and an arrow indicating which direction their glucose was trending.

1. Current glucose

The bold number indicates your connection’s latest glucose reading in what’s called a reading card. The colour band on the reading card indicates whether your connection’s glucose is high, low, in target or out of target.

Red indicates a low glucose reading (<70 mg/dL or 3.9 mmol/L).

Orange indicates a high glucose reading (>240mg/dL or 13.3 mmol/L).

Green indicates readings in your connection’s target range.

Yellow indicates readings between your connection’s target range and their high and low thresholds.

In some cases, instead of a bold number, you may see a glucose reading of “LOW” or “HIGH.”

“LOW” indicates a glucose reading lower than 2.2 mmol/L (40 mg/dL).

“HIGH” indicates a glucose reading higher than 27.8 mmol/L (500 mg/dL).

If either of these readings is seen, the FreeStyle LibreLink User Guide states that the user should check their blood glucose with a test strip. If they get a “LO” or “HI” result from a blood glucose meter, the FreeStyle LibreLink user should contact their healthcare professional immediately.

2. Trend arrow

This arrow shows which way your connection’s glucose was heading at the time of the scan. There are five possible trends:

Glucose is rising quickly

More than 0.1 mmol/L (2 mg/dL) per minute

Glucose is rising

Between 0.06 mmol/L - 0.1 mmol/L (1-2 mg/dL) per minute

Glucose is changing slowly

Less than 0.06 mmol/L (1 mg/dL) per minute

Glucose is falling

Between 0.06 mmol/L - 0.1 mmol/L (1-2 mg/dL) per minute

Glucose is falling quickly

More than 0.1 mmol/L (2 mg/dL) per minute

The trend arrow may not always appear with your reading if there is insufficient data. Also, the arrow will not display in the notifications you receive on your phone. Instead, you will see text describing the glucose rate of change (e.g., glucose is falling).

3. Scan history

The last 100 scans are listed below the latest reading card. The list starts with second most recent reading.

Still have questions?

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