Divide the standard deviation of your CGM glucose by the mean and multiply by one hundred. The consensus target for the resulting CV is 36 percent or less.
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- Risk spectrum with your position marked
- Reference ranges from the original publication
- Shareable link, nothing stored
Scientific references
Why stability matters
Two people can share an average glucose while one swings between highs and lows. Swings drive oxidative stress and hypoglycemia risk, which is why modern CGM reports rank CV beside the average.
Understanding your result
- 36 percent or less counts as stable by international consensus
- Above 36 percent is unstable and usually means meal spikes, correction stacking or both
Flattening the curve
Pre bolusing insulin fifteen minutes early, pairing carbs with protein or fat, and walking after meals all compress the swings without changing the average much.
Where to find SD and mean
Every CGM app reports both in its statistics panel, usually beside the GMI and time in range.