Blood Sugar 113 mg/dL: Normal or Prediabetes?

A fasting blood sugar of 113 mg/dL (about 6.3 mmol/L) is above the normal 70–99 mg/dL range and falls in the prediabetes range of 100–125 mg/dL. After eating or at a random time of day, 113 mg/dL is normal (below 140 mg/dL). One fasting reading is not a diagnosis: prediabetes is confirmed with a repeat fasting test, an A1C test or a glucose tolerance test.

Medical Disclaimer

This page is general information, not medical advice. Home meters can be off by several mg/dL, and only a healthcare provider can diagnose prediabetes or diabetes. Discuss your results with a doctor.

Is 113 mg/dL Normal? It Depends on When You Measured

Type of reading	When it is taken	Normal (no diabetes)	113 mg/dL is…
Fasting glucose	After at least 8 hours with no food or caloric drinks, e.g. before breakfast	70–99 mg/dL (3.9–5.5 mmol/L)	Above normal – prediabetes range (100–125)
2 hours after a meal	Two hours after you start eating	Below 140 mg/dL (7.8 mmol/L)	Normal
Random glucose	Any time, regardless of food	Usually below 140 mg/dL	Normal
Average glucose (from A1C)	Estimated average over about 3 months	A1C below 5.7% (average below about 117 mg/dL)	An average of 113 mg/dL matches an A1C of about 5.6% – upper normal

Thresholds above follow the American Diabetes Association (ADA) criteria. Some organizations, such as the World Health Organization, start the “impaired fasting glucose” range at 110 mg/dL (6.1 mmol/L) instead of 100 – by either definition, a fasting 113 mg/dL is above normal.

Fasting Blood Sugar of 113 mg/dL

A fasting result of 113 mg/dL – for example, 113 mg/dL measured before breakfast – is not normal, but it is also not diabetes. Diabetes starts at a fasting glucose of 126 mg/dL (7.0 mmol/L) on two separate tests. The 100–125 mg/dL range is called impaired fasting glucose, one form of prediabetes.

Diagnostic ranges (ADA)

Test	Normal	Prediabetes	Diabetes
Fasting plasma glucose	Below 100 mg/dL	100–125 mg/dL (113 is here)	126 mg/dL or higher
2-hour oral glucose tolerance test	Below 140 mg/dL	140–199 mg/dL	200 mg/dL or higher
A1C	Below 5.7%	5.7–6.4%	6.5% or higher

Why one reading is not a diagnosis

Was it really fasting? Coffee with milk or sugar, juice or a late snack can raise the result.
The “dawn phenomenon”: early-morning hormones raise glucose a little in many people.
Illness, stress, poor sleep and some medicines (such as steroids) can temporarily raise glucose.
Meter accuracy: home glucose meters are allowed a margin of error, so a lab test is more reliable.

If your fasting glucose is 113 mg/dL, ask your doctor about a repeat lab fasting glucose or an A1C test. If prediabetes is confirmed, it is a strong signal to act – lifestyle changes can often bring glucose back to normal.

113 mg/dL in mmol/L

113 mg/dL = 6.3 mmol/L (113 ÷ 18 = 6.28). Most of Europe, Canada and Australia report glucose in mmol/L; the US uses mg/dL. In mmol/L, normal fasting glucose is below 5.6, and the ADA prediabetes range is 5.6–6.9 mmol/L.

Blood Glucose Unit Converter

mg/dL

6.3 mmol/L

113 mg/dL for Different People

Young adults (for example, a 24-year-old woman)

Normal glucose ranges are the same for all adults, whatever their age or sex. So for a 24-year-old, 113 mg/dL after eating or at a random time is fine, while 113 mg/dL fasting is above normal and worth re-checking. Prediabetes at a young age is worth taking seriously because there are many years ahead for it to progress – but it also responds well to changes in activity, diet and weight.

People with diabetes

For many adults with diabetes, the ADA suggests a before-meal target of 80–130 mg/dL and a peak after-meal level below 180 mg/dL. By those general targets, 113 mg/dL is a good reading – but your own targets should come from your care team.

Pregnancy

Targets in pregnancy are lower. For gestational diabetes, commonly used targets are a fasting glucose below 95 mg/dL, below 140 mg/dL one hour after meals, or below 120 mg/dL two hours after meals. A fasting 113 mg/dL during pregnancy should be discussed with your midwife or doctor promptly.

Children

The same fasting thresholds are generally used for children, but any concern about a child’s blood sugar should be checked by a pediatrician.

How to Lower a Fasting Blood Sugar of 113

Move more: aim for at least 150 minutes a week of moderate activity such as brisk walking, plus muscle-strengthening exercise twice a week. A short walk after meals also helps.
Lose a little weight if you are overweight: in the US Diabetes Prevention Program, losing about 7% of body weight with 150 minutes of weekly activity cut the risk of developing type 2 diabetes by 58%.
Choose fiber-rich carbohydrates: vegetables, beans, lentils and whole grains instead of sugary drinks, white bread and sweets.
Watch sugary drinks: soda, juice and sweetened coffee raise glucose quickly.
Sleep 7–9 hours and manage stress; poor sleep and chronic stress worsen glucose control.
Don’t smoke, and keep alcohol moderate.

Your doctor may also suggest a structured diabetes prevention program and, in some higher-risk cases, medication such as metformin.

When to See a Doctor

Book an appointment if:

Your fasting glucose is 100 mg/dL or higher on more than one occasion
You have symptoms such as strong thirst, frequent urination, blurred vision, unexplained weight loss or constant tiredness
You are pregnant and have a fasting reading above 95 mg/dL
You have risk factors such as overweight, a family history of type 2 diabetes, high blood pressure or a history of gestational diabetes

Seek urgent care if very high readings come with vomiting, confusion, deep rapid breathing or severe drowsiness.

Frequently Asked Questions

Is a fasting blood sugar of 113 normal?

No. Normal fasting blood sugar is 70–99 mg/dL. A fasting result of 113 mg/dL is in the prediabetes range (100–125 mg/dL), but it is not diabetes, which starts at 126 mg/dL. A single reading should be confirmed with a repeat fasting test or an A1C test.

Is 113 mg/dL before breakfast normal?

A reading taken before breakfast after an overnight fast counts as a fasting glucose, so 113 mg/dL is slightly above normal (normal is below 100 mg/dL). Re-check on another morning, make sure you had nothing but water beforehand, and ask your doctor about an A1C test if it stays at 100 or above.

Is 113 mg/dL normal after eating?

Yes. Two hours after a meal, normal blood sugar is below 140 mg/dL, so 113 mg/dL is a healthy after-meal reading. A random reading of 113 mg/dL taken at any time of day is also normal.

Is 113 blood sugar fine for a 24-year-old woman?

If it was measured after eating or at a random time, yes. If it was a fasting reading, 113 mg/dL is above the normal range for any adult, regardless of age or sex, so it is worth repeating and discussing with a doctor.

Is an average blood sugar of 113 good or bad?

An average glucose of 113 mg/dL corresponds to an A1C of about 5.6%, which is just below the 5.7% prediabetes threshold – upper normal. For someone with diabetes it would represent very good control.

What is 113 mg/dL in mmol/L?

113 mg/dL of glucose equals about 6.3 mmol/L (113 divided by 18). As a fasting value, 6.3 mmol/L is above normal (below 5.6 mmol/L) and within the prediabetes range.

Can stress or illness cause a glucose of 113?

Yes. Stress hormones such as cortisol and adrenaline, infections, poor sleep and some medicines like steroids can temporarily raise blood sugar. That is one reason a single high reading should be repeated before drawing conclusions.

Do I need medication for a blood sugar of 113?

Usually not as a first step. If prediabetes is confirmed, guidelines recommend lifestyle changes first: more physical activity, healthier eating and modest weight loss if needed. Doctors sometimes add medication such as metformin for people at higher risk.