A correction here means a bolus with no carbs logged within 30 minutes of it. If corrections keep ending low, or keep ending high, show your doctor. Don't change pump settings off this app.
Same numbers, cleaned up and no swearing. Copy it into a message or the patient portal, or export every entry as a spreadsheet.
Everything after that moment is a guess. Time, food, insulin that's still working and clocks that are set wrong all drag the real number away from the one on the screen. Everything below is a made-up person. None of it's your data.
The meter shows where your blood sugar was the second the blood hit the strip. Then it keeps moving. Sitting still, maybe less than a point a minute. After a meal or a dose, 1 to 2 points a minute is normal, and a big meal can push it past that. Drag the slider and watch the fan open up.
Before you add more, look at your pump's IOB (some pumps call it active insulin). If there's still a pile of it working, that's why the number hasn't moved yet.
Your pump drips a little insulin all day and all night. Those are your basal rates. They cover the sugar your liver dumps out on its own, even when you haven't eaten a thing. Their job is keeping you level between meals.
Most pumps don't count basal in the IOB number. So IOB can say 0 while basal keeps flowing. That's normal, nothing's broken. If your background comes from a daily long-acting shot instead, a late or missed shot fucks up everything after it.
Your pump runs basal off its own clock. If that clock's wrong, every rate change happens at the wrong fucking time, every single day. The meter's clock matters too. Anything you copy out of its memory carries the meter's time, right or wrong.
After a daylight saving change, check the pump and the meter. Many don't change their clocks on their own.
These only turn units and grams into points on the Now page. Copy them off your pump. This app will never tell you how much to take.
Copy your basal schedule off the pump. Each row runs from its start time until the next row kicks in.
This pulls readings straight off Dexcom's Share servers, the same ones the Dexcom Follow app uses. Your phone talks to Dexcom directly. Nothing goes through any other server, and the password never leaves this phone except to Dexcom.
Two catches. Share has to be turned on in the Dexcom app with at least one follower invited, or there's nothing to pull. And this is Dexcom's unofficial back door, not their official API, so they can break it whenever they feel like it.
Share only hands over the last 24 hours. For anything older, log in at clarity.dexcom.com, click the export icon on any report, pick your dates, and bring the .csv file in here. Readings, plus any insulin and carbs logged in the Dexcom app, get merged in without doubling up.
The app can't talk to your pump or meter, so this part's on you. Look at the device, type in the time it shows (AM or PM too), and hit Compare. The app measures it against this phone's clock, which sets itself from the network, and remembers the difference. Do it within a minute of looking or the number's off.
That difference moves your basal schedule on the timeline to when the pump is really running it, and it can fix the time on readings you copy out of the meter's memory. It doesn't change anything on the devices. Fixing the clock on the pump itself is still your job.
Meter accuracy: the ISO 15197 standard lets a home meter be off by up to 15 points below 100 mg/dL and up to 15% at 100 and above, on 95% of readings. So about 1 in 20 can be off by more than that.
Drift speed: Dexcom's own arrow chart calls under 1 point a minute steady, 1 to 2 "slowly rising" or "slowly falling" (the slanted arrow), 2 to 3 a straight arrow, and over 3 a double arrow.
Insulin: the exponential curve from OpenAPS and Loop, the open-source pump software. It peaks at 75 minutes for rapid insulin and 55 for the faster stuff, and ends at the duration you set above.
Food: a basic 3-hour absorption curve. It's there to show the shape. Real meals are all over the place, and fat and protein slow them down.
All of this is averages. Your body, the pump site, exercise, stress and being sick all shove these numbers around.