Gestational Diabetes Risk Calculator

Work out gestational diabetes risk instantly with clear inputs, formula shown and shareable results.

About Gestational Diabetes Risk Calculator

Counts the NICE NG3 gestational diabetes risk factors, including BMI of 30 or more and maternal age of 40 or more, and reports whether glucose tolerance testing is indicated.

Formula

NICE NG3 risk factors

BMI >=30, previous gestational diabetes, previous macrosomic baby >=4.5 kg, first-degree relative with diabetes, family origin with high diabetes prevalence

Worked example

With the default values below, Gestational Diabetes Risk Calculator returns Risk factors present of 1. Change any input above and every figure here is recalculated in your browser.

Inputs used

Pre-pregnancy body mass indexaccepts 14–60 kg/m2: 28 kg/m2
Maternal ageaccepts 15–55 years: 32 years
Other NICE risk factors presentaccepts 0–5: 1

Results

Risk factors present: 1
Screening implication: At least one risk factor — NICE NG3 recommends a 75 g oral glucose tolerance test at 24-28 weeks
Risk tier: One risk factor
BMI check: BMI below 30

Step by step

1Values used
2NICE NG3 risk factors
3Risk factors present= 1
4Screening implication= At least one risk factor — NICE NG3 recommends a 75 g oral glucose tolerance test at 24-28 weeks
5Risk tier= One risk factor
6BMI check= BMI below 30

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Does one risk factor trigger testing?

Yes. NICE NG3 recommends an oral glucose tolerance test when any single listed risk factor is present.

Is age 40 a formal factor?

Advanced maternal age is included in several national guidelines even though NICE lists the four factors above; it is counted here as a modifier.