When to Check Blood Sugar While Fasting in Ramadan
When to check: at sehri, around midday, in the hour before iftar, and 2 hours after iftar, plus any moment you feel unwell. A reading under 70 mg/dL or over 300 mg/dL means break the fast.
Quick facts
- Four key checks: sehri, midday, before iftar, 2 hours after iftar.
- Extra checks: any time you feel shaky, sweaty, dizzy, confused or very thirsty.
- Break the fast at: under 70 mg/dL or over 300 mg/dL.
- Finger-prick and roza: most scholars say it doesn’t break the fast; ask yours.
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A lot of people with diabetes quietly stop checking their sugar during Ramzan. Some worry the finger-prick breaks the fast, while others simply feel they’re “doing fine”, are tired of numbers after a long year of them, and would rather not see a bad reading in the middle of a blessed month. Fair. Also risky, because the fasting month is exactly when sugar behaves differently from the rest of the year. This guide explains which checks matter most, what each one tells you, and what to write down for your doctor. It belongs to our Ramzan Health series.
Does checking blood sugar break the fast?
It comes first. Most Islamic scholars and fatwa councils that have addressed it say a finger-prick blood test does not break the roza, because nothing is eaten or drunk, nothing enters the body, and taking a drop of blood out is viewed differently from putting something in. That said, practice varies and this is a religious ruling, not a medical one. Ask your own scholar once, before Ramzan, so the worry doesn’t come back every afternoon.
Medically? Simpler. Diabetes doctors and international Ramadan guidance see regular checking as part of fasting safely, not as a weakness or a lack of faith, and a meter is the only way to know whether that trembling at 4 pm is ordinary tiredness from a short night or a genuine low that needs sugar now. Check.
The best times to check, and what each one tells you
Think of each reading as a photo taken at a different point on a long road trip, where a single photo of the motorway tells you almost nothing about where you started, where you stopped for chai and where you nearly ran out of petrol. Four show the route.
| When | What it shows |
|---|---|
| At sehri, before eating | Your starting point after the night; high here often means late heavy eating. |
| Midday, around Zuhr | How sehri and your medicines are carrying you through the morning. |
| In the hour before iftar | The lowest point of the day for most people and the most important safety check. |
| 2 hours after iftar | How the iftar meal landed; the spike check. |
| Any time you feel unwell | Whether symptoms mean a low, a high or something else. |
Some doctors want more. A reading 2 hours after sehri, or at bedtime after taraweeh, is common in the first week or for anyone on insulin. Follow the schedule your doctor gives you; the table is the minimum that many plans build on.
The last hour before iftar is the one check you should never skip.
What the numbers mean during roza
The house rule on this site matches international Ramadan diabetes guidance. It’s written in mg/dL, which most meters in Pakistan and India show. If yours reads in mmol/L, 70 is 3.9 and 300 is 16.7.
- Under 70 mg/dL: break the fast now, take 15 g of fast sugar (half a glass of ordinary juice, or 3 level teaspoons of sugar in water), recheck in 15 minutes.
- 70 to 90 in the early afternoon: no need to break the fast, but recheck in an hour and avoid heavy activity.
- Roughly 90 to 250: the everyday working range for many people during a fast. Your own targets may be tighter.
- Over 300 mg/dL: break the fast with water and call your doctor the same day. With vomiting, drowsiness or deep breathing, go to hospital.
For a full chart of normal fasting, after-meal and HbA1c values outside Ramzan, see our sugar level chart.
How to check properly, so the number is real
A wrong number is worse than no number. It lies. A meter reads whatever is sitting on your finger, so a trace of date syrup or sugar from iftar prep can push a reading far too high and make you think the day went badly when your blood was actually fine.
- Wash your hands with soap and warm water and dry them fully. Don’t use the first drop if you’ve been handling food and can’t wash.
- Use the side of a fingertip, not the pad. It hurts less. Rotate fingers across the day.
- Check the strip’s expiry date, and keep strips in their closed tube away from heat. A car dashboard in May ruins them.
- Squeeze gently from the base of the finger. Hard squeezing adds tissue fluid and can lower the reading.
- Write it down straight away: time, number, and a word or two (“before iftar, shaky”).
- Bring the log to your doctor after the first week of Ramzan, or earlier if you’ve had any reading under 70 or over 300.
Continuous glucose monitors (CGMs), the small sensors worn on the arm, are becoming more common in Pakistani and Indian cities, and because they show trends across the whole day and can sound an alarm for lows, they suit a long fast well. If you have one, ask your doctor what alarm levels to set for Ramzan, and still confirm a strange reading with a finger-prick before acting on it.
Set four phone alarms
Label them “Sehri check”, “Zuhr check”, “Pre-iftar check” and “2-hour check”. Alarms remove the daily decision. That’s where people slip.
Myth: feeling fine means sugar is fine
Many people feel perfectly well at readings of 250 and feel shaky at 110 if they’ve come down quickly from a high, because the body gets used to its usual level and reads any sudden change as an alarm, whichever direction it goes. Feelings drift. And some people, especially after many years of diabetes, lose the early warning signs of a low altogether. The meter doesn’t guess.
Did you know? A glucose meter reading is allowed to be a little off. International meter standards accept small differences from a lab test, which is why one odd number should be repeated before you act on it, unless you have symptoms. Symptoms win.
If you haven’t yet had the pre-Ramzan talk, our roza with diabetes questions for your doctor gives you the list to bring.
Checking tells you when to act, but it doesn’t decide medicine. Any change to the timing or amount of insulin or tablets during Ramzan is for your doctor alone, even if your readings look high or low. People on insulin or sulfonylurea tablets, pregnant women, older adults and anyone with kidney disease should agree a written check-and-break plan before the month starts. If someone is confused, faints or can’t swallow, skip the meter and call your local emergency number (1122 in Pakistan, 112 in India).
Questions about checking sugar while fasting
Does checking blood sugar break the fast in Ramadan?
Usually not. Most scholars say a finger-prick test does not break the fast, since nothing is eaten or drunk. Ask your own scholar for a ruling you’re comfortable with.
When should a diabetic check sugar during roza?
At sehri, around midday, in the hour before iftar and 2 hours after iftar, plus any time of feeling unwell. Your doctor may add more checks.
What sugar level means break the fast?
Under 70 mg/dL or over 300 mg/dL. Also break it for hypo symptoms when no meter is available.
What is normal sugar before iftar?
For many people with diabetes it sits somewhere between about 90 and 150 mg/dL. Anything under 70 means break the fast; your doctor may give you a personal target.
How many times a day to check sugar in Ramzan?
Usually at least four times on fasting days, more in the first week, after any medicine change, or on insulin. Your doctor sets the final number.
Can people on tablets only skip sugar checks?
Not entirely. People on metformin alone have a lower risk of lows, but checking is still wise. Those on sulfonylureas such as gliclazide or glimepiride need regular checks because lows are common.
Does a CGM sensor break the fast?
Probably not. Sensors don’t put food or drink into the body, and many scholars treat them like a finger-prick. The ruling is for your scholar to confirm.
Why is the meter reading different from the lab test?
Meters read blood from a fingertip, while labs usually test vein blood with larger machines, so small gaps are normal. Dirty fingers, old strips and heat cause bigger errors.
What if the reading is 300 but there are no symptoms?
Break the fast. Use water, and call your doctor the same day, even if you feel fine. High sugar during a fast dehydrates the body quickly.
Should sugar be checked at sehri or after eating sehri?
Before. The main check is before eating sehri. Some doctors also want one 2 hours after sehri during the first week to see how the morning goes.