Health tracking

Glucose Reading Log

Add each fingerstick or sensor reading with the time and whether it was fasting, before or after a meal. The log flags lows and highs against your targets and summarises the period you choose.

-Average
-In target
0Lows
0Highs
-Estimated A1C (GMI)
ContextReadingsAverageRange
Edit targets
Date and timeReadingContextStatusNote

Runs entirely in your browser. Nothing is uploaded to any server.

Why log glucose readings

See patterns

Context shows whether highs come after particular meals or overnight.

Track lows

Counting lows helps your care team adjust medication safely.

Prepare for visits

Averages, time in target and an estimated A1C summarise weeks of data.

How to use the glucose log

  1. Choose units and targetsPick mg/dL or mmol/L and adjust the targets if your care team uses others.
  2. Add readingsEnter the value, date, time and meal context, then save.
  3. Review the summaryCheck time in target, lows, per-context averages and the chart.

Understanding your readings

A single reading is a snapshot that depends on food, activity, stress, illness and medication. Patterns over days matter more: repeated high fasting readings, after-meal spikes or lows at a particular time of day.

Time in target is the share of readings within the target for their context. Fasting and pre-meal readings use the fasting range; post-meal readings use the post-meal maximum; others use a general 70-180 mg/dL range.

Fasting / before meals

80-130 mg/dL (4.4-7.2 mmol/L).

1-2 h after meals

Below 180 mg/dL (10.0 mmol/L).

Low

Below 70 mg/dL (3.9 mmol/L).

Glucose log FAQ

What targets does the log use?

By default the common adult targets from the American Diabetes Association: 80-130 mg/dL (4.4-7.2 mmol/L) fasting and before meals, under 180 mg/dL (10 mmol/L) one to two hours after meals, and under 70 mg/dL (3.9) counted as low. Your care team may set different targets - you can edit them.

How is the estimated A1C calculated?

The Glucose Management Indicator formula: GMI (%) = 3.31 + 0.02392 x mean glucose in mg/dL. It is only meaningful with many readings spread across the day, ideally 14 days of sensor data.

How do I convert mg/dL and mmol/L?

Divide mg/dL by 18 to get mmol/L, or multiply mmol/L by 18. The log stores values internally in mg/dL and converts for display.

What counts as a low?

Below 70 mg/dL (3.9 mmol/L) is level 1 hypoglycemia; below 54 mg/dL (3.0 mmol/L) is level 2 and needs prompt treatment.

Is this medical advice?

No. It is a personal log to share with your care team. Follow your treatment plan for any low or high readings.

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