Skip to content
Haley Maddox
All type 1 guides
Field notes · Type 1

My glucose charts

The charts I check most in Zukka, the Dexcom app and Nightscout, and what each one tells me.

Target range

Coll. Haley Maddox · Oct 2026Next guide: Insulin delivery →
A note before you read
My diabetes care is managed in close partnership with my care team, a group of people who care a lot about getting it right. This page shares what works for me, with my own numbers. It isn't medical advice, and my goals aren't targets for anyone else. Talk with your own doctor or diabetes care team before you change anything about your care. New to the apps? Start with the setup guide.
Start here

The numbers to know

Most of these charts use the same handful of measures. These are the general targets from the international consensus on time in range, for most adults with type 1 or type 2 diabetes. Your own targets may differ. My goals, set with my care team, are tighter. I look at them over time, never day by day.

MeasureWhat it meansGeneral targetMy goal
Time in rangeShare of the day between 70 and 180 mg/dLOver 70%97% or more
Time below rangeShare of the day under 70 mg/dLUnder 4%0 to 2%
Very lowShare of the day under 54 mg/dLUnder 1%
Time above rangeShare of the day over 180 mg/dLUnder 25%
Time in tight rangeShare of the day between 70 and 140 mg/dL. A newer, stricter measure.No official targetOver 90%
Above tight rangeShare of the day over 140 mg/dLNo official target8% or less
CVCoefficient of variation: how much glucose swings around its average36% or less

Experts at a 2024 diaTribe panel suggested about 50% time in tight range as a starting point, but there's no official guideline yet. Sources: AJMC: consensus time-in-range targets · diaTribe: time in tight range

Tool 1Daily check

Zukka: Statistics

Zukka's Statistics tab is where I look first. It has two views, Summary and Trends, and you can switch between the last 7, 30, 60 or 90 days.

Zukka Statistics Summary for 7 days: time in range 97 percent, low 3 percent, high 0 percent; time in tight range 88 percent; average 108 mg/dL; GMI 5.9 percent; CV 21 percent; data capture 96 percent.
Summary, last 7 days

Summary

What it shows
Two colored bars for time in range (70 to 180) and time in tight range (70 to 140), then tiles for average glucose and CV.
How to open it
Open Zukka, tap Statistics at the bottom, then Summary. Pick 7d, 30d, 60d or 90d at the top.
What to look for
  • A mostly green bar, with the red low slice kept small.
  • CV stays left of its target marker.
  • Tap Generate Report to save the numbers to share.
My last 7 days
97% in range88% tight range108 mg/dL averageCV 21%
Zukka Statistics Trends for 90 days: a daily glucose pattern with shaded bands between 70 and 180, a weekly GMI trend near 5.9 percent, a CV trend near 20 to 22 percent, and a daily pattern bar chart averaging 96 percent.
Trends, last 90 days

Trends

What it shows
  • The day overlaid: every day stacked onto one 24-hour graph. The bright line is the typical reading and the shaded bands show the spread.
  • CV trend: how steady glucose has been, week by week.
  • Daily Pattern: a bar for each day, with the average shown at the top.
How to open it
In Statistics, tap Trends, then pick a time span. 90d gives the clearest picture.
What to look for
  • Times of day when the bands push toward 180 or down toward 70.
  • A flat CV line, which means things are holding steady.
Tool 2Big picture

Dexcom app: Trends

The Dexcom app's Trends tab, under Overview. Choose 3, 7, 14, 30 or 90 days at the top.

Dexcom app Time in range for 30 days: 0 percent very high, 1 percent high, 96 percent in range, 2 percent low, under 1 percent very low, and a 1 percent drop since the prior 30 days.
Time in range, last 30 days

Time in range

What it shows
One bar split five ways, from very high to very low, with the change since the last period underneath.
What to look for
The "change since prior period" line, for a quick sense of direction.
My last 30 days
96% in range2% low1% high
Dexcom app Average day for 30 days: a green bar for each hour showing its usual range, with a dot for the typical reading, all between 70 and 180 and mostly near 100 to 120.
Average day, last 30 days

Average day

What it shows
Every day stacked into one. Each hour gets a green bar for its usual range and a dot for the typical reading, against the 70 to 180 band.
What to look for
Hours where the bars stretch toward 70 or 180. Turn the phone sideways for a bigger view.
Tool 3Deep dive

Nightscout: Week to week

Nightscout reporting, Week to week view for Sunday October 11 to Saturday October 17, 2026: each weekday drawn as a different colored dotted line across one 24-hour graph, mostly between 70 and 180.
Week to week, Oct 11 to 17, 2026
What it shows
Each day of the week drawn in its own color on one 24-hour graph, so a whole week can be compared at once. The green band is the target range.
How to open it
  1. Open your Nightscout site and choose Reports from the menu.
  2. Tap the Week to week tab.
  3. Pick dates or tap Last week, then press SHOW.
What to look for
  • A color that keeps going high or low at the same time, like a workout day or a late dinner.
  • Patterns that only show up on certain days.
  • Other tabs to try: Daily Stats, Distribution and Percentile Chart.
Tool 4Meals

SNAQ

Coming soon. My favorite SNAQ chart: how a meal moved my glucose afterward.
Sources