How to keep a blood sugar log your doctor can actually use

Short answer: write one line per reading with the time, the glucose value, the moment it was taken (fasting, before meal, after meal, bedtime) and, if you have them, insulin units and carbs. Bring averages and the full list to your appointment.

1. Log the moment, not just the number

A reading of 160 mg/dL means something different before breakfast than 2 hours after lunch. Tag every reading: fasting, before meal, after meal, bedtime or other. This is what lets your care team see before/after meal averages instead of a pile of numbers.

2. Add insulin and carbs in the same line

If you use insulin, write the units you took and which kind (rapid or long-acting). If you count carbs, add the grams and the meal. Keeping them on the same line as the glucose reading means nobody has to match two notebooks later.

3. Keep it short enough to do every time

The best log is the one you keep. If a reading only has a glucose value, log it anyway. A note like "walked after dinner" or "sick day" is enough context — you don't need to write a diary entry.

4. Use one unit and your own target range

Stick to the unit your meter shows (mg/dL or mmol/L) and mark each reading as below, in or above the target range you agreed with your care team. That makes patterns easy to spot at a glance.

5. Turn the log into a report before the appointment

Doctors usually want a summary first: average glucose, fasting and after-meal averages, how many readings were in range, and then every entry for the period. A printable page saves the appointment from scrolling through your phone.

How Dropvel helps

Dropvel puts glucose, a moment tag, rapid and long-acting insulin units, carbs and a note on one screen — glucose alone is enough to save. Each entry is marked below, in or above your own target range, and the Trends tab makes a free PDF with averages, time in target, an A1c estimate and every entry, ready to share or print. No account is needed and entries stay on your phone.

This guide is general information, not medical advice. Your targets, medication and insulin doses are decided with your care team.

FAQ

What should a blood sugar log include?

At minimum the date, time, glucose value and when it was taken (fasting, before a meal, after a meal, bedtime). Insulin units, carbs and a short note make it much more useful for your care team.

How long after a meal is an after-meal reading?

It is usually taken about 2 hours after you start eating, but ask your care team which timing they want you to use, and keep it the same every time.

How many readings should I log a day?

That depends on your treatment and what your care team asked for. Log every reading you take; a log with gaps is still better than no log.

← See Dropvel: a simple diabetes log with a PDF report for your doctor