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Continuous glucose monitors (CGM) — reference ranges
A small sensor under the skin reads glucose every few minutes and draws the whole curve — not just the moments you prick. A different picture: shape, not points.
| Faixa | mmol/L | mg/dL | O que significa |
|---|---|---|---|
| Time in range | 3.9-10.0 mmol/L | 70-180 mg/dL | The international consensus target: for most adults with diabetes, at least 70% of the day inside this band. |
| Below range | under 3.9 | under 70 | The consensus target is under 4% of the day below 3.9 mmol/L, and under 1% below 3.0. |
| Above range | over 10.0 | over 180 | The consensus target is under 25% of the day above 10 mmol/L. |
Ler no contexto
For someone without diabetes, a CGM mostly shows a flat line between 4 and 7.8 mmol/L with modest, brief bumps after meals. The useful habits the curve exposes: which meals spike and crash, what a walk after eating does to the peak, and what alcohol does to the overnight line.
The sensors read the fluid between cells, not blood, so they lag blood glucose by 5-15 minutes and read lower during rapid change — when the trend arrow points down, the real blood value is usually lower than the screen. Finger-prick checks stay the reference for decisions.
A CGM is a trend tool, not a diagnostic one: the wearer's own clinician sets the targets, and the consensus time-in-range numbers above are for adults with diabetes, not a scorecard for healthy wearers.
Quando ver um clínico
- CGM values repeatedly above 11 mmol/L or below 3.9 — bring the report, not just the feeling, to a clinician.
- A hypo with a flat or rising arrow that stays low despite treatment — treat first, review after.
Só referência, não um diagnóstico. Os limiares desta página são valores OMS e ADA ao nível da população; o seu clínico interpreta os seus próprios números contra o seu histórico, medicamentos e outros exames. Se um valor vem com sintomas, ou continua a mover-se na direção errada, esse é o sinal para agir — não esta página.