Enter your 75g glucose tolerance test results to see how they compare with the current Australian reference ranges.
⚠️ This tool compares your numbers with published reference ranges only. It does not diagnose gestational diabetes or any other condition, and it does not replace your GP, obstetrician, or diabetes educator. Your care team confirms and interprets any result.
All values in mmol/L (the standard Australian pathology unit). Leave a field blank if that timepoint wasn't tested.
Gestational diabetes is diagnosed if any one of these is met, at any stage of pregnancy. Higher values suggest diabetes that may predate the pregnancy ("overt diabetes in pregnancy") and need prompt review.
| Timepoint | Normal | Gestational diabetes | Overt diabetes |
|---|---|---|---|
| Fasting | <5.3 | 5.3–6.9 | ≥7.0 |
| 1 hour | <10.6 | ≥10.6 | — |
| 2 hour | <9.0 | 9.0–11.0 | ≥11.1 |
| HbA1c | — | — | ≥6.5% |
Source: ADIPS 2025 consensus recommendations (Sweeting et al., MJA 2025), superseding the 2014/2015 ADIPS criteria. Values are venous plasma glucose in mmol/L, the standard Australian laboratory unit.
These are the self-monitoring targets your diabetes educator or GP will typically ask you to aim for once a gestational diabetes diagnosis is confirmed — different from the one-off diagnostic thresholds above. Your team will set your personalised targets.
| When | Target (gestational) |
|---|---|
| Fasting / before meals | <5.3 <95 mg/dL |
| 1 hour after meals | <7.8 <140 mg/dL |
| 2 hours after meals | <6.7 <120 mg/dL |
Sources: Diabetes Australia — RACGP National Guide to Preventive Health Assessment — ADIPS. Track your day-to-day readings with our Blood Sugar Log.
Your GP or obstetric team confirms the result and usually refers you to a diabetes educator and dietitian. Most people manage gestational diabetes with diet and lifestyle changes plus regular blood glucose monitoring at home. Some people also need medication (metformin and/or insulin) — this is a decision for your care team, not something a general information tool can advise on.
You'll likely have more frequent antenatal visits and additional growth scans. After birth, gestational diabetes usually resolves, but you'll be offered a follow-up glucose test at 6–12 weeks postpartum, and you carry a higher lifetime risk of type 2 diabetes — ongoing monitoring is recommended.
In Australia, universal screening with a 75g OGTT at 24–28 weeks is routinely offered to all pregnant women. If you have risk factors (previous gestational diabetes, family history of diabetes, higher BMI, older maternal age, some ethnic backgrounds, PCOS, or previous large baby), your team may also test earlier in pregnancy. Talk to your GP or midwife about your own testing schedule.
Values at or above the overt-diabetes cut-offs (fasting ≥7.0 mmol/L, 2-hour ≥11.1 mmol/L, or HbA1c ≥6.5%) suggest diabetes that was likely already present before pregnancy, rather than gestational diabetes that developed because of it. This needs prompt review by your GP or obstetric team — please contact them as soon as possible if this applies to you, rather than waiting for your next routine appointment.
ADIPS updated its diagnostic thresholds in 2025 — some older Australian and international sources (and some search results) still show the earlier 2014/2015 ADIPS figures, or non-Australian (WHO/IADPSG) figures, which differ slightly. This page uses the current 2025 ADIPS consensus recommendations. If your pathology report or hospital uses different figures, ask your care team which guideline they follow.
This checker is an information tool only. It compares numbers you enter against published reference ranges — it does not calculate a risk score, does not diagnose gestational diabetes or overt diabetes in pregnancy, and does not replace assessment by your GP, obstetrician, or diabetes educator. Only a qualified clinician can confirm a diagnosis and recommend management, in the context of your full pregnancy and medical history.
Reference ranges can vary between laboratories and guidelines, and your treating team may use different thresholds for individual clinical reasons. Always follow the advice of your own care team over the general ranges shown here.
If you have symptoms such as excessive thirst, frequent urination, or blurred vision, or you are unwell, contact your GP, midwife, or obstetric team promptly. In an emergency, call 000.
Last reviewed: July 2026, against the ADIPS 2025 consensus recommendations. Verify current thresholds at the above sources, particularly if your pathology report uses different figures. This site is operated by Digital Treasure Pty Ltd ACN 696 816 636 and is not a registered health service.