Blood Sugar 175 mg/dl — Too High? Fasting & After Eating
Where 175 mg/dl sits — adjust to your situation
175 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.
175 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.
How years of readings around 175 reach the kidneys
Each kidney contains about a million tiny filters, the glomeruli, made of fine blood vessels. When glucose runs high for years, and especially when blood pressure is high as well, these filters are strained and slowly scarred. One of the first signs is that a protein called albumin, which healthy filters hold back, starts to leak into the urine.
Diabetic kidney disease causes no symptoms for a long time. Swelling of the legs, tiredness or foamy urine usually only appear when kidney function is already quite reduced. That is why it is found through tests, not through how a person feels.
Two simple tests, at least once a year
ADA recommends checking kidney health at least yearly in people with type 2 diabetes from diagnosis, and in people with type 1 after the first years. Two results matter:
- Urine albumin-to-creatinine ratio (UACR). A spot urine sample, no collection needed. Under 30 mg/g is normal. 30 to 299 is moderately increased, and 300 or more is severely increased. Because exercise, fever, an infection, very high glucose or a period can raise the result temporarily, a high value is usually confirmed with repeat samples over the next three to six months.
- Estimated glomerular filtration rate (eGFR). Calculated from a blood creatinine level. It estimates how much blood the kidneys filter each minute. An eGFR below 60 that lasts more than three months indicates chronic kidney disease.
The two tests answer different questions. UACR shows whether the filters are leaking; eGFR shows how much filtering capacity remains. Both can change long before symptoms appear.
What helps protect them
Several measures slow kidney damage, and they work best together:
- Glucose control. Bringing a high long-term average down lowers the strain on the filters.
- Blood pressure control. Often as important as glucose. ACE inhibitors or ARBs are commonly used when albumin is raised, because they reduce pressure inside the filters.
- Kidney-protective diabetes medicines. SGLT2 inhibitors have been shown to slow the loss of kidney function in many people with diabetes and kidney disease.
- Not smoking, and keeping cholesterol in check.
- Care with pain relievers. Regular use of NSAIDs such as ibuprofen or naproxen can harm kidneys that are already strained. Ask a pharmacist which pain relief suits you.
Sugar in the urine is not the same as kidney damage
Readings in the 170s are close to the level at which healthy kidneys start letting glucose into the urine, about 180. Glucose on a urine dipstick only reflects a high blood level at that moment, or an SGLT2 medicine; it does not mean the kidneys are damaged. Albumin in the urine is the more meaningful early warning. If you have never had a UACR, ask for one at your next visit. Ways to bring the long-term average down are on the how to lower blood sugar page.
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 175 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 175 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 175 mg/dl
Is 175 mg/dl blood sugar normal?
It depends on when you measured. Fasting, 175 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 175 mg/dl in mmol/L?
175 mg/dl equals 9.7 mmol/L. Divide mg/dl by 18 to convert (used in the UK, Canada, Australia and most of Europe).
Does one reading of 175 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 175 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 175 can correspond to a true value anywhere from 149 to 201 mg/dl. Fasting, the entire window stays inside the diabetes range band — this classification is robust even to meter error. After a meal, the window touches the 200 mg/dl boundary.
What A1C would 175 mg/dl correspond to?
If 175 mg/dl were your average glucose over three months, it would work out to an A1C of about 7.7 % — 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 urine albumin was high on one test. Does that mean I have kidney disease?
Not yet. A single high result can come from hard exercise the day before, a fever, a urinary infection or a period. Doctors usually repeat the test, and they call albumin raised only when at least two of three samples over a few months are high. If it is confirmed, treatment at this early stage can slow or even reverse the leak.
Why did my eGFR drop slightly after starting a new medicine?
Some kidney-protective medicines, including ACE inhibitors, ARBs and SGLT2 inhibitors, often cause a small early dip in eGFR because they lower the pressure inside the filters. Doctors expect this and usually recheck within weeks. A small dip that then stabilises is common; a large or continuing drop is a reason for the doctor to review the medicine.
BloodSugarEasy — blood sugar reading report
Reading: 175 mg/dl (9.7 mmol/L)
Fasting classification: Diabetes range · After-meal classification: Prediabetes range
Reference: ADA criteria, reviewed 2026-11-03 · https://bloodsugareasy.com/blood-sugar-175/
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