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What to do if…
your glucose monitor or insulin device alarms and you are not sure what it means

Short answer

Assume either your blood sugar may be unsafe or insulin delivery might be interrupted until proven otherwise. If you can, confirm with a fingerstick glucose check, and treat possible low blood sugar immediately.

Do not do these things

  • Don’t ignore repeated alarms or silence them and go back to sleep without checking.
  • Don’t take extra insulin or extra carbs based only on a reading you don’t trust—confirm if you can.
  • Don’t drive or do risky activities while you’re unsure what the alarm means.
  • Don’t give food or drink to someone who is very sleepy, confused, seizing, or unconscious.
  • Don’t change lots of things at once (sensor + site + app + settings) before confirming your actual glucose.

What to do now

  1. Check how you feel first. If you feel low (shaky, sweaty, weak, confused, blurred vision), treat it as low blood sugar right away.
  2. If possible, check a fingerstick glucose now. Treat based on the fingerstick result and symptoms if you don’t trust the CGM number.
  3. If your blood sugar is low (often under 70 mg/dL) or you feel low: use the 15–15 rule: take 15g fast-acting carbs, wait 15 minutes, then recheck and repeat if still low. When you’re back up and stable, eat a snack/meal (follow your plan).
  4. If someone can’t swallow safely, is unconscious, or having a seizure: call 911 immediately. If you have glucagon and someone present knows how to give it, use it while waiting for emergency help.
  5. Look at the alarm message and sort it into a simple bucket (don’t over-decode).
    • Low / urgent low → treat first.
    • High → confirm with fingerstick; if you feel sick, think about ketones (next step).
    • Delivery problem / occlusion / no delivery / pump stopped → assume insulin may not be getting in.
    • Sensor error / signal loss / calibration required / app disconnected → assume the reading may be unreliable.
    • Low reservoir / low battery / “change set/sensor soon” → fix once you’ve confirmed you’re safe.
  6. If you suspect insulin delivery failed (pump alarm): act like insulin might be interrupted.
    • Check for: pump suspended/stopped, kinked tubing, dislodged/painful site, wet/leaking adhesive, empty cartridge/reservoir, expired insulin.
    • If you can, replace the infusion set/site and insulin.
    • Use your backup plan (many people are instructed to use insulin pens/syringes temporarily). If you don’t have a clear plan, call your diabetes clinician/on-call line rather than guessing doses.
  7. If glucose is high and you feel unwell (especially if you use a pump): if you have ketone strips/meter, check ketones.
    • Go to the ER / seek urgent evaluation now if you think you could be developing DKA (for example vomiting, severe abdominal pain, deep/rapid breathing, fruity-smelling breath, confusion, extreme sleepiness), if ketones are moderate/high on your test, or if you can’t keep fluids down.
  8. If the alarm comes through a phone/app: reduce the risk of missing the next alert—check phone volume, silent mode, “Do Not Disturb,” notification permissions, Bluetooth connections (including car/audio accessories), and battery saver settings. Then confirm the alarm status on the device/app.
  9. Stabilize the next hour. Tell someone you trust what’s happening and ask them to check in; keep fast carbs, your meter/strips, and glucagon nearby; recheck frequently until you feel steady and readings make sense.

What can wait

  • Perfectly interpreting trend graphs, alarm codes, or app history.
  • Firmware/app updates, re-pairing devices, and “deep troubleshooting.”
  • Non-urgent reporting. If you suspect a serious device malfunction or it caused harm, you can report it later to the FDA (MedWatch) and/or the manufacturer.

Important reassurance

It’s common to feel overwhelmed when diabetes tech alarms—especially at night. You don’t have to solve everything: confirm your glucose, treat lows first, and assume possible insulin interruption if a pump alarm suggests delivery trouble.

Scope note

These are first steps only. Your exact targets, correction doses, ketone action plan, and pump/closed-loop procedures should come from your clinician and your device’s official instructions.

Important note

This is general information, not medical advice for your specific situation. If symptoms are severe, worsening, or you can’t reliably confirm your glucose or insulin delivery, seek urgent medical care.

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