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CGM (continuous glucose monitor)

A sensor worn on the body that measures glucose every few minutes, day and night.

A continuous glucose monitor is a small sensor worn on the skin that measures glucose in the fluid between cells every few minutes and sends the readings to a phone or reader. ForeSight calls these sensor readings, as distinct from meter (fingerstick) readings.

Figures such as time in range, GMI, variability (CV) and the AGP are calculated from sensor readings only.

Source: ADA Standards of Care 2026, section 7; International consensus on time in range, 2019

mg/dL and mmol/L

Two units for glucose: mmol/L = mg/dL ÷ 18. ForeSight stores mg/dL.

Glucose is measured in milligrams per decilitre (mg/dL) in the United States and some other countries, and in millimoles per litre (mmol/L) in many others. To convert, divide mg/dL by 18: 70 mg/dL is 3.9 mmol/L, 180 mg/dL is 10.0 mmol/L.

ForeSight stores and calculates every figure in mg/dL. A meter reading you enter in mmol/L is converted when it is saved, and the value and unit you typed are kept alongside it.

Source: ForeSight

Time in range (TIR)

The share of your sensor readings between 70 and 180 mg/dL.

Time in range is the percentage of your continuous glucose monitor (CGM) readings that were between 70 and 180 mg/dL (3.9 and 10.0 mmol/L). 70% of the time is about 17 hours a day.

The international consensus target for most adults with type 1 or type 2 diabetes is more than 70% of readings in this range. Your care team may set a different target for you.

For older adults with complex health, the ADA goals are looser: more than 50% in range and less than 1% below 70 mg/dL (3.9 mmol/L).

ForeSight shows time in range only for sensor readings, never for meter readings.

Source: International consensus on time in range, 2019; ADA Standards of Care 2026, section 6

Time below range

The share of your sensor readings below 70 mg/dL, and below 54 mg/dL.

Time below range is the percentage of your CGM readings under 70 mg/dL (3.9 mmol/L). The consensus also counts readings under 54 mg/dL (3.0 mmol/L) on their own, because they are lower still: 54–69 mg/dL is level 1 hypoglycemia; below 54 mg/dL is level 2.

The consensus targets for most adults are less than 4% of readings below 70 mg/dL (about 1 hour a day) and less than 1% below 54 mg/dL (about 15 minutes a day).

For older adults with complex health, the ADA goals are looser: more than 50% in range and less than 1% below 70 mg/dL (3.9 mmol/L).

Source: International consensus on time in range, 2019; ADA Standards of Care 2026, section 6

Time above range

The share of your sensor readings above 180 mg/dL, and above 250 mg/dL.

Time above range is the percentage of your CGM readings over 180 mg/dL (10.0 mmol/L). Readings over 250 mg/dL (13.9 mmol/L) are also counted on their own; ForeSight calls them severe highs.

The consensus targets for most adults are less than 25% of readings above 180 mg/dL and less than 5% above 250 mg/dL.

Source: International consensus on time in range, 2019; ADA Standards of Care 2026, section 6

Average glucose

The mean of your sensor readings over the period.

The average of your CGM readings over the period shown. ForeSight first groups readings into 5-minute steps, so a sensor that reports more often does not count twice.

Source: ForeSight

GMI (glucose management indicator)

An estimate of A1c calculated from your average sensor glucose.

GMI turns your average CGM glucose into a figure on the same scale as a lab A1c: GMI (%) = 3.31 + 0.02392 × average glucose in mg/dL.

It is most meaningful with at least 14 days of sensor data worn at least 70% of the time. It is an estimate, not a lab result.

Source: Bergenstal et al., GMI, 2018; International consensus on time in range, 2019

A1c and GMI

A1c is a lab blood test; GMI is estimated from your sensor. They can differ.

A1c is measured in a blood sample and reflects your glucose over roughly the past two to three months. GMI is calculated from your CGM readings over the period you choose.

The two often differ, sometimes by half a point or more, for reasons that include how long red blood cells live. A difference does not mean either one is wrong. ForeSight shows your lab A1c results as you entered or imported them, separately from GMI.

Source: Bergenstal et al., GMI, 2018; ADA Standards of Care 2026, section 6

Lab A1c

Your latest A1c result from a lab or a home test, as you entered or imported it.

A1c (also called HbA1c) is measured in a blood sample and reflects your average glucose over roughly the past two to three months. ForeSight shows the results you enter or import from lab reports, with the date of each.

The ADA Standards of Care give an A1c goal of less than 7% for many non-pregnant adults, and say goals should be set individually: yours may be different. See also "A1c and GMI" for how A1c relates to sensor figures.

Source: ADA Standards of Care 2026, section 6

Glucose variability (CV)

How much your sensor glucose swings around its average, in percent.

The coefficient of variation (CV) is the standard deviation of your readings divided by their average, as a percentage. A higher CV means larger swings.

The international consensus considers a CV of 36% or less to be stable glucose.

Source: International consensus on CGM, 2017; International consensus on time in range, 2019; ADA Standards of Care 2026, section 6

AGP (ambulatory glucose profile)

A picture of a typical day, built from many days of sensor readings.

The ambulatory glucose profile stacks many days of CGM readings onto one 24-hour clock. The middle line is the median at each time of day; the shaded bands show where most readings fell (the middle half, and the range from the 5th to the 95th percentile).

It shows patterns that repeat at the same time of day. The consensus recommends it as the standard one-page summary of CGM data.

Source: International consensus on time in range, 2019; ADA Standards of Care 2026, section 7

Sensor wear

How much of the period your sensor was recording.

Sensor wear is the share of the period in which your CGM recorded readings. The consensus considers figures such as time in range and GMI reliable when the sensor was worn at least 70% of the time over 14 days.

Source: International consensus on time in range, 2019; ADA Standards of Care 2026, section 6

Range (lowest to highest)

Your lowest and highest sensor reading in the period.

The lowest and the highest CGM reading in the period shown. A reading beyond what the sensor can measure is shown as the sensor's limit with a sign, for example <40 or >500, not as an exact number.

Source: ForeSight

Readings

How many 5-minute sensor readings the figures are based on.

The number of 5-minute steps with a sensor reading in the period. A full day has 288. Fewer readings mean the figures rest on less data.

Source: ForeSight

Fingerstick and calibration readings

Meter readings you enter: a fingerstick, or a calibration taken near a sensor reading.

A fingerstick reading is a blood glucose reading from a meter that you add yourself. ForeSight calls it a calibration reading when your sensor also has a reading within 30 minutes of it, as when you check or calibrate a sensor; you can change this when editing it.

Both show as diamonds on your glucose chart. Neither is ever counted in sensor figures such as time in range or GMI. If your glucose data for a period comes from a meter, both count toward the meter figures.

Source: ForeSight; ADA Standards of Care 2026, section 7

HI and LO meter values

Your meter showed HI or LO: the reading was above or below what it can measure.

When a meter shows HI or LO, the glucose was above or below the range the meter can measure, so there is no exact number. ForeSight records it as "above the meter's range" or "below the meter's range".

These readings are counted but never averaged: a HI counts as above the target, and a LO as a reading below 54 mg/dL (3.0 mmol/L). Neither is ever counted as in target.

Source: ForeSight

Before-meal and after-meal targets

For meter readings: 80–130 mg/dL before a meal, below 180 mg/dL 1–2 hours after one starts.

For meter readings, the ADA Standards of Care give general targets for many non-pregnant adults: 80–130 mg/dL (4.4–7.2 mmol/L) before a meal, and below 180 mg/dL (10.0 mmol/L) 1 to 2 hours after the start of a meal. Your care team may set different ones.

ForeSight shows how many of your before-meal and after-meal readings were within these, with the count of readings, when your glucose data comes from a meter.

Source: ADA Standards of Care 2026, section 6

Low meter readings

How many of your meter readings were below 70 mg/dL, and below 54 mg/dL.

For meter readings ForeSight counts lows rather than giving a percentage of time, because a meter only sees the moments you checked. In the ADA Standards of Care, 54–69 mg/dL (3.0–3.8 mmol/L) is level 1 hypoglycemia; below 54 mg/dL (3.0 mmol/L) is level 2. A LO reading counts as below 54.

Source: ADA Standards of Care 2026, section 6; ForeSight

Personal target and the ADA standard

Your own target range from Settings, shown beside the standard 70–180 mg/dL.

The standard range of 70–180 mg/dL (3.9–10.0 mmol/L) is used for every standard figure, so they can be compared with published targets. If you set your own target range in Settings, ForeSight also shows figures for it, labelled "personal". It never replaces the standard.

The ADA Standards of Care say glycemic goals should be individualized. Your personal range is the one you entered; ForeSight does not suggest one.

Source: ADA Standards of Care 2026, section 6; ForeSight

Life events

Things you mark that can affect a stretch of days, such as an illness or travel.

A life event is something you mark with a start and, when it is over, an end: an illness, a hospital stay, a missed medication, travel, stress, unusual exercise, or something else. It shows as a shaded band on your glucose chart and a span on the Overview timeline.

Life events are not part of any figure. AI summaries are told only the kind of event and its dates, never your note, and may say only that part of a period overlapped it.

Source: ForeSight

Insulin types

The type of insulin you choose when you log it, used only to group your entries.

When you log insulin you pick its type: rapid-acting, short-acting, intermediate, long-acting, premixed, inhaled, pump bolus, pump basal (the day's total as your pump shows it), or other. Use the type on your insulin's label or your prescription.

ForeSight uses the type only to add up your entries by type and to draw basal insulin differently on the chart. It never suggests which insulin or how much to take, and AI summaries are told nothing about your insulin.

Your totals add up what you logged each day, by type. The average per day over 14, 30 or 90 days is divided by the days on which you logged insulin, not by all the days in the period: a day with nothing logged is left out, not counted as zero. Averages use complete days only; today is shown apart as "so far today".

Source: ForeSight

"Not in the metrics"

Shown on the chart, but not counted in any figure.

Some things on the glucose chart are there for context only: meter readings, life events, insulin, meals, medications, activity and blood pressure. The legend marks them "not in the metrics". Figures such as time in range, average glucose, GMI and CV use sensor readings only.

Source: ForeSight

Endo Prep

A one-page summary to bring to your next diabetes appointment.

Endo Prep gathers your recent figures, the patterns ForeSight found, your lab A1c history and your life events and logged insulin into a page you can print or save as a PDF. An AI writes talking points and questions you may want to ask.

It describes patterns only. It never suggests a dose, a medication or a change of treatment; those decisions belong with your care team. The AI is not told your insulin or your notes.

Source: ForeSight

Connect FreeStyle Libre with a follower account

1. Choose a second email address that you control and that is not the one you use for LibreLink.
2. On the phone with your sensor, open the LibreLink app, go to Profile, then Connected Apps, then LibreLinkUp, and invite that second email address.
3. Install the LibreLinkUp app, create an account with the second email address and a new password, and accept the invite.
4. Back in LibreLink, under Profile, then Connected Apps, then LibreLinkUp, check that the follower shows as Connected. If it does not, the invite has not been accepted yet.
5. In ForeSight, open "Settings", find "Libre live sync", enter the second email address and its password, choose your region, tick "I understand this uses an unofficial Abbott interface that may stop working.", and press "Test connection".

To end sharing later, press Stop sharing next to the follower; ForeSight's sync then stops. Use a follower account, never your main LibreLink account. The connection is unofficial and may stop without notice. ForeSight is not affiliated with, endorsed by or sponsored by Abbott.

Add a meter reading

1. Open "Blood Glucose Data" and press "+ Add a meter reading".
2. Type the number on the pad and check the unit (mg/dL or mmol/L). If your meter showed HI or LO, choose that instead.
3. Choose when you took it (fasting, before a meal, after a meal, bedtime or other) and, if it was not just now, change the time.
4. Add a note if you like, and press "Save".

Log a life event

1. Open "Log" and choose the "Life event" tab.
2. Pick what happened, and check the start time.
3. Leave "Still going on" ticked if it has not ended, or untick it and set the end. A missed medication has no end time, so it's logged as a single moment.
4. Add how bad it was (for an illness, hospital stay or stress) and a note if you like, and press "Log life event".
5. When an ongoing event ends, press "End now" next to it under "Recent entries".

Your notes stay private. The AI sees only the kind of event and its dates.

Log insulin

1. Open "Log" and choose the "Insulin" tab.
2. Type the units on the pad, and pick the type (and, if you like, what it was for).
3. Check the time, and add the product name and a note if you like. The last type and product you used are filled in for you.
4. Press "Log insulin". Above 50 units in one entry, ForeSight asks once whether the number is right: press "Save anyway", or "Fix it" to change it.

ForeSight records what you took. It never suggests a dose. The AI is not told your doses.

Download a copy of your data

1. Open "Privacy & consent" (left menu, or the menu under your initial at the top right).
2. Under "Export your data", enter your password and press "Download my data". You get one ZIP file with all your data and documents, as JSON and CSV.
3. Or choose to have a download link emailed to you instead. You need to be signed in to use it, it works once and expires after 7 days.