Blood Sugar 168 mg/dl — Too High? Fasting & After Eating
Where 168 mg/dl sits — adjust to your situation
168 mg/dl as a fasting reading
Diabetes range
A fasting reading of 126 mg/dl or higher falls into the diabetes range. Diagnosis requires a repeat test on another day — take this result to your doctor.
Fasting = no food for at least 8 hours, typically first thing in the morning. More on fasting readings.
168 mg/dl after eating
Prediabetes range
Between 140 and 199 mg/dl two hours after a meal suggests impaired glucose tolerance, the post-meal form of prediabetes.
Guidelines measure 2 hours after the start of a meal. More on post-meal readings.
An average near 168 lines up with an A1C of about 7.5 %
The ADAG formula connects A1C with estimated average glucose. An A1C of 7.5 % works out to an average of about 169 mg/dl, so an average of 168 lands right there. Compared with the widely used goal of under 7 %, which matches an average of about 154, that is roughly half an A1C point, or 14 to 15 mg/dl of average glucose, above target.
Half a point sounds small, but A1C is a slow-moving measure. Moving it by half a point usually takes a few months of steady change.
Many different days can produce the same 168
An average hides the shape behind it. Two people with the same 168 can have very different days:
- Steady but high: readings that hover between 150 and 185 almost all day. Few swings, but rarely in the lower part of the range.
- Low baseline, big spikes: mornings in the 120s, then sharp peaks above 250 after two meals. The same average, but much more variability.
The first person might benefit most from a medicine change that lowers everything a little. The second might gain more from changing meal size, food choices or mealtime insulin timing. That is why care teams ask for fasting, before-meal and after-meal values, not only the average.
For some people, 7.5 % is the goal
ADA does not set one A1C target for everyone. Under 7 % suits many adults. A stricter goal, such as under 6.5 %, can make sense for some people early in type 2 if it can be reached without lows. A looser goal, such as under 8 %, is often chosen for older adults with other serious illnesses, for people who have had severe lows, or when the risks of tight control outweigh the benefits.
So an average around 168 is “above target” for one person and exactly on plan for another. Ask your care team which goal they have set for you and why, and ask again when your health, medicines or daily life change, because the right target can shift over the years.
When meter averages and lab A1C disagree
Meter software calculates an average only from the moments you test. If most checks happen before breakfast, the average leans toward fasting values. If most happen after meals, it leans higher. A CGM average is closer to the true picture, because it samples the whole day and night.
The lab A1C can also drift away from true average glucose. Anemia, recent blood loss or transfusion, kidney disease and some hemoglobin variants all affect it. When the two numbers disagree by a lot, a doctor may look for one of these reasons. The A1C and blood sugar page explains the conversion in more depth.
Measured right after exercise?
There is no official range for readings taken during or just after a workout, so the two classifications above do not apply to them. How exercise moves blood sugar.
How 168 mg/dl compares to a typical day
Typical day without diabetes; your reading is the horizontal line — higher than a typical day reaches two hours after a meal; brief one-hour peaks this high are common.
What to do with a reading of 168 mg/dl
Book a doctor's appointment to confirm with a lab test (fasting glucose or A1C). If you are already diagnosed, this reading belongs in your log for your care team.
What actually moves the number: How to lower blood sugar, Foods that steady your glucose and Exercise and blood sugar.
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Questions about 168 mg/dl
Is 168 mg/dl blood sugar normal?
It depends on when you measured. Fasting, 168 mg/dl is diabetes range (normal fasting range: 70–99 mg/dl). Two hours after a meal it is prediabetes range (normal post-meal range: 70–139 mg/dl).
What is 168 mg/dl in mmol/L?
168 mg/dl equals 9.3 mmol/L. Divide mg/dl by 18 to convert (used in the UK, Canada, Australia and most of Europe).
Does one reading of 168 mg/dl mean I have diabetes?
No single home reading is a diagnosis. Guidelines require a second abnormal lab result, either a different test from the same blood draw or a repeat on another day (fasting glucose, an oral tolerance test, or A1C). But a reading like this is exactly the reason those tests exist — take it to your doctor.
How accurate is a home reading of 168 mg/dl?
Home meters are allowed an error of ±15 mg/dl below 100 mg/dl and ±15 % from 100 up (ISO 15197), so a displayed 168 can correspond to a true value anywhere from 143 to 193 mg/dl. Fasting, the entire window stays inside the diabetes range band — this classification is robust even to meter error.
What A1C would 168 mg/dl correspond to?
If 168 mg/dl were your average glucose over three months, it would work out to an A1C of about 7.5 % — at or above the 6.5 % diabetes threshold. A single reading is not an average — but the conversion shows what this level would mean as a habit. How the two measures relate: A1C and blood sugar.
My meter average is 168 but my lab A1C came back at 6.9 %. Which is right?
Both can be correct for what they measure. If you test mostly after meals or on days when you feel unwell, the meter average will run higher than your true 24-hour average. A1C reflects every hour, including overnight hours you never test. Bring the meter to your next appointment so the team can see when the readings were taken.
How fast can an A1C of 7.5 % come down?
A1C reflects roughly the past two to three months, with the most recent weeks counting most. After a real change in treatment or habits, a lower result can show up within about three months. Testing much sooner rarely shows the full effect, which is why A1C is usually repeated about every three months while treatment is being adjusted.
BloodSugarEasy — blood sugar reading report
Reading: 168 mg/dl (9.3 mmol/L)
Fasting classification: Diabetes range · After-meal classification: Prediabetes range
Reference: ADA criteria, reviewed 2026-11-03 · https://bloodsugareasy.com/blood-sugar-168/
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