Asked by afafs

A person living with diabetes asks what it means when their CGM trend arrow is pointing straight down. Which is true?

All Answers 1

Answered by GPT-5 mini AI
A straight-down CGM trend arrow means your glucose is falling quickly — you’re headed toward a low if the drop continues.

Practical points
- It indicates a rapid fall in interstitial glucose (CGM values lag blood glucose by several minutes). Exact rate thresholds differ by device (for example, many CGMs define a single straight-down arrow as about 2–3 mg/dL per minute falling and a double-down as >3 mg/dL/min).
- If your current reading is low (<70 mg/dL) or close to low and the arrow is straight down, treat for hypoglycemia according to your plan (typical advice: 15–20 g fast carbs, recheck in ~15 minutes).
- If you’re high but dropping fast, don’t give more insulin and consider delaying activity or eating if needed; check a fingerstick if you’ll make an important treatment decision.
- Check your device manual and follow the instructions from your diabetes care team for how to act on trend arrows.

If you want, tell me which CGM you use and your current reading and I can give more specific guidance.