Blood sugar levels in pregnancy
The one place where the numbers really are different — and they are lower, not higher.
Nothing here can diagnose you, and nothing here is a treatment plan. Blood glucose results are interpreted by a doctor alongside your history, your symptoms and a repeat test — a single number on a screen is not a diagnosis. If any reading concerns you, or if you feel unwell, see a doctor rather than a website.
Everywhere else on this site the thresholds are the same regardless of age. Pregnancy is the genuine exception, and it moves in the opposite direction to what the age charts suggest.
Under the WHO 2013 criteria, gestational diabetes is diagnosed from a fasting plasma glucose of 5.1 mmol/L — 92 mg/dL — which outside pregnancy would be an unremarkable result well inside the normal range. The two-hour threshold, 8.5 mmol/L (153 mg/dL), is likewise far below the 200 mg/dL used for non-pregnant adults. One value at or beyond any of the three limits is enough.
| Measurement | mmol/L | mg/dL |
|---|---|---|
| Fasting | 5.1 – 6.9 | 92 – 125 |
| 1 hour after a 75 g glucose load | 10.0 or above | 180 or above |
| 2 hours after a 75 g glucose load | 8.5 – 11.0 | 153 – 199 |
A fasting value of 7.0 mmol/L (126 mg/dL) or above, or a 2-hour value of 11.1 mmol/L (200 mg/dL) or above, is classified by WHO as diabetes in pregnancy rather than gestational diabetes — a different category with different follow-up. Pregnancy testing is arranged and interpreted by your obstetric team.
Indian obstetric practice also uses a single-step non-fasting test in some settings, and different institutions follow different protocols. Which test you are given, when in the pregnancy, and how the result is acted on are decisions for your obstetric team.
For comparison — the non-pregnant adult criteria
Shown only so the size of the difference is visible. Do not read a pregnancy result against this table.
| Result | Published value | Same value in mmol/L |
|---|---|---|
| Fasting plasma glucose — at least 8 hours with no food | ||
| Normal | 99 mg/dL or below | 5.5 mmol/L or below |
| Prediabetes | 100 to 125 mg/dL | 5.6 – 6.9 mmol/L |
| In the diabetes range | 126 mg/dL or above | 7.0 mmol/L or above |
| 2 hours into a 75 g oral glucose tolerance test | ||
| Normal | 139 mg/dL or below | 7.7 mmol/L or below |
| Prediabetes | 140 to 199 mg/dL | 7.8 – 11.0 mmol/L |
| In the diabetes range | 200 mg/dL or above | 11.1 mmol/L or above |
| HbA1c | ||
| Normal | below 5.7% | — |
| Prediabetes | 5.7% to 6.4% | — |
| In the diabetes range | 6.5% or above | — |
| Random (any time of day) | ||
| In the diabetes range | 200 mg/dL or above with the classic symptoms of high blood glucose | 11.1 mmol/L or above |
A result in the diabetes range is not a diagnosis. Published criteria require confirmation — normally a repeat of the same test on a separate day, unless someone has unmistakable symptoms with a clearly raised glucose. Your doctor makes that call, not a chart.
Source: American Diabetes Association, Standards of Care in Diabetes — Diagnosis and Classification of Diabetes. Diabetes Care 2025;48(Suppl. 1):S27–S49. Link
Source: World Health Organization. Diagnostic criteria and classification of hyperglycaemia first detected in pregnancy. Geneva: WHO, 2013. Link
PeakForm is a training and accountability programme. It is not a treatment for diabetes or prediabetes, it is not a substitute for your doctor's advice, and nothing on this site should be acted on before speaking to one.
Common questions
What is a normal fasting blood sugar level?
What is a normal sugar level after eating?
Does the normal blood sugar range change with age?
Is one high reading enough to diagnose diabetes?
What is the normal blood sugar level for pregnancy?
Pregnancy thresholds from the WHO 2013 guideline on hyperglycaemia first detected in pregnancy. General information only — NOT medical advice, and never a diagnosis. Only a doctor can interpret your results and diagnose or treat diabetes. If a reading concerns you, see a doctor rather than a website. Every threshold, equation and glycemic index value used on this site is listed with its publication on the data & method page.