The CGM Interpretation Toolkit — 22-Page Interactive PDF Guide

Read your own data.

A continuous glucose monitor takes a reading every five minutes. That's 288 a day, and just over 4,000 in a fortnight. Your appointment is fifteen minutes long.

The CGM Interpretation Toolkit exists to close that gap from your side — so you can recognise what you're looking at, stop worrying about the readings that are artifacts rather than problems, and turn two weeks of graph into one page your clinician can actually use.

It explains what patterns mean. It never tells you what to do about them. There is no dosing advice anywhere in this guide, and there never will be. Where you'd reasonably want to act, it hands you a question to ask your clinician instead — one written out on every pattern page.

What's inside

• What the sensor is actually measuring. Interstitial fluid, not blood — the one fact that explains the lag, the disagreements with your meter, and why the trend arrow matters more than the number.
• The five numbers. Time in range, time below, time above, GMI and coefficient of variation, in plain English, so you can read any brand's summary screen.
• How to read the AGP. The ambulatory glucose profile is the most useful picture your CGM makes and the one most people skip past. Annotated, with what to look at first.
• Six curve shapes, drawn. The spike, the plateau, the double peak, the rollercoaster, the dawn rise, the flat line — a vocabulary, so you can say "a double peak after dinner, most nights" instead of "it's been weird".
• Six artifacts that look like problems. Compression lows, warm-up wobble, the lag, sensor drift — what gives each one away.
• A method for any pattern. Four questions: what shape, what time, what else was true, does it repeat.
• Five common patterns, each with what to check before you conclude anything, and a question worth asking at your next appointment.
• What to log, a two-week review sheet, and an appointment prep page that compresses a fortnight into one pattern, three questions, and the numbers that matter.
• When to call and when to wait. What needs help now, what's worth a message, and what can save itself for your next visit.
• Questions worth asking — and four that waste the slot.

What you get

• A 22-page PDF, US Letter (8.5 × 11 in), designed to read well on a phone and print cleanly at home
• 20 fillable fields across the review and appointment-prep pages — type into them on any device, or print and use a pen
• A clickable contents page, page-to-page navigation, and PDF bookmarks
• Works with any brand of sensor. Nothing here is device-specific.
• Instant download after checkout. Yours to keep.

What this is not

• Not a treatment plan.
• Not dosing advice, ever.
• Not a substitute for your care team — it's built to make appointments better, not to replace them.
• Not device-specific instructions. Your manufacturer's documentation covers that.

Who it's for

Anyone wearing a sensor who has looked at the graph and thought "I don't really know what I'm seeing." People who've messaged their clinic about a reading that turned out to be nothing. People who arrive at a fifteen-minute appointment with fourteen days of screenshots and leave feeling like nothing got covered.

Common questions

Does this work with my sensor?
Yes. Every brand reports roughly the same five numbers and produces some version of the same chart, with slightly different labels. The guide teaches the concepts, not one company's app.

Will it tell me what to change?
No, and that's deliberate. Every decision about medication, dosing or treatment belongs to you and your clinician. What this guide does is make you much better at recognising what's worth raising — and much calmer about what isn't.

I don't have diabetes, I just wear a sensor. Is it still useful?
Yes. The mechanism pages, the curve shapes and the artifacts section apply to anyone reading CGM data. The targets referenced on page 5 are clinical figures, and the guide is explicit that they're set by a clinician rather than by a PDF.

Does it include target ranges?
Consensus figures appear once, on page 5, with a clear statement that your own targets are set by your clinician and may be very different. You'll meet those numbers in your own app anyway — better to meet them with the caveat attached.

What device do I need?
Any. The fillable fields work in Adobe Acrobat Reader, Apple Books, Preview, and most mobile PDF apps. If your reader doesn't support forms, print it.

Please read

This guide is educational content only. It is not medical advice, diagnosis, or treatment, and it is not a substitute for the plan your clinician has given you. Never change your medication, insulin dose, or treatment on the basis of anything in it. Targets referenced are general consensus figures; your own are set by your clinician and may be very different, particularly if you are pregnant, older, hypoglycaemia-unaware, or new to therapy. Treat low glucose according to the plan your care team gave you, and confirm a reading with a fingerstick whenever your symptoms and your sensor disagree. If you feel unwell, act on how you feel — not on what the graph says.

Digital product. Because the file is delivered instantly and cannot be returned, all sales are final. If your download doesn't work, contact us and we'll fix it.