75g ogtt results
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75g OGTT diagnostic criteria interpretation 2024 WHO ADA
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75 g OGTT - Interpretation of Results
The 75 g oral glucose tolerance test (OGTT) is a standard diagnostic tool. The patient fasts for at least 8 hours, ingests 75 g of glucose in water, and plasma glucose is measured at fasting and 2 hours (and sometimes at 1 hour in gestational diabetes screening).
For Non-Pregnant Adults (ADA 2024 Criteria)
| Category | Fasting PG | 2-h PG (75g OGTT) | HbA1c |
|---|---|---|---|
| Normal | < 100 mg/dL (< 5.6 mmol/L) | < 140 mg/dL (< 7.8 mmol/L) | < 5.7% |
| Prediabetes (IGT) | 100-125 mg/dL (5.6-6.9 mmol/L) | 140-199 mg/dL (7.8-11.0 mmol/L) | 5.7-6.4% |
| Diabetes | ≥ 126 mg/dL (≥ 7.0 mmol/L) | ≥ 200 mg/dL (≥ 11.1 mmol/L) | ≥ 6.5% |
- IFG (Impaired Fasting Glucose): Fasting 100-125 mg/dL (ADA cut-off; WHO uses 110-125 mg/dL)
- IGT (Impaired Glucose Tolerance): 2-h PG 140-199 mg/dL
- In the absence of unequivocal hyperglycemic symptoms, a positive result must be confirmed on a repeat test on a separate day.
Source: Tintinalli's Emergency Medicine (Table 223-2); ADA Standards of Care 2024
For Gestational Diabetes (GDM) - One-Step 75 g OGTT (IADPSG/ADA Criteria)
Performed at 24-28 weeks' gestation, after an overnight fast (≥8 hours). GDM is diagnosed if any one of the following thresholds is met or exceeded:
| Timepoint | Threshold |
|---|---|
| Fasting | ≥ 92 mg/dL (5.1 mmol/L) |
| 1 hour | ≥ 180 mg/dL (10.0 mmol/L) |
| 2 hours | ≥ 153 mg/dL (8.5 mmol/L) |
Based on the HAPO (Hyperglycemia and Adverse Pregnancy Outcome) study. Note: ACOG still recommends the two-step approach (50 g GCT followed by 100 g OGTT) in the US.
Key Notes on Test Preparation
- Patient must consume ≥150 g carbohydrate per day for at least 3 days before the test
- Must be in a normal state of activity (not bed rest)
- Fast for at least 8 hours prior to the test
- No smoking, exercise, or medications that affect glucose during the test
Quick Reference Summary
| Result | Non-Pregnant 2-h PG | Gestational (any value) |
|---|---|---|
| Normal | < 140 mg/dL | Fasting < 92, 1h < 180, 2h < 153 |
| Prediabetes/IGT | 140-199 mg/dL | N/A (diagnose GDM instead) |
| Diabetes / GDM | ≥ 200 mg/dL | Any threshold met |
Sources:
- Tintinalli's Emergency Medicine, Table 223-2
- Creasy & Resnik's Maternal-Fetal Medicine, Box 59.2 & Table 59.1
- ADA Standards of Care in Diabetes - 2024 (via PMC)
Dipsi test guidelines
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DIPSI test guidelines gestational diabetes India criteria 2024
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DIPSI gestational diabetes screening India
Here is a comprehensive guide to the DIPSI test:
DIPSI Test - Complete Guidelines
DIPSI = Diabetes in Pregnancy Study Group of India. The test is endorsed as India's "One Nation, One Test" standard by the Ministry of Health and Family Welfare (MoHFW), Government of India (updated 2018), and is also endorsed by WHO, FIGO, IDF, FOGSI, API, RSSDI, and ESI.
What Makes DIPSI Unique
Unlike the standard OGTT, the DIPSI test is a non-fasting 75 g oral glucose test. The patient does not need to fast beforehand, making it far more practical for routine antenatal care - especially in low-resource and community settings.
Procedure (Step by Step)
- The pregnant woman is given 75 g of oral glucose dissolved in 250-300 mL of water
- This is given irrespective of fasting or non-fasting state - no regard to the time of the last meal
- A venous blood sample is collected at 2 hours for plasma glucose estimation
- Method: Glucose oxidase-peroxidase (GOD-POD) method, or a standardized plasma-calibrated glucometer (point-of-care)
- If the woman vomits within 30 minutes of ingesting glucose - repeat the test the next day; if vomiting occurs after 30 minutes, the test proceeds normally
Interpretation of Results
| 2-Hour Plasma Glucose | Interpretation | Action |
|---|---|---|
| < 120 mg/dL | Normal | Routine ANC; repeat test if high-risk |
| 120-139 mg/dL | Gestational Glucose Intolerance (GGI) | Close follow-up required |
| ≥ 140 mg/dL | GDM Diagnosed | Start management |
When to Test (Timing)
| Visit | Action |
|---|---|
| 1st Antenatal Visit | Screen all pregnant women (universal screening) |
| 24-28 weeks | Repeat if 1st visit result was negative |
| 32-34 weeks | Repeat in high-risk women even if previous tests were negative |
Indian data shows ~1/3 of women are diagnosed with GDM in the first trimester, and GDM can develop later in pregnancy, hence repeat testing is important.
Management After a Positive Test (≥ 140 mg/dL)
- Medical Nutrition Therapy (MNT) for 2 weeks - first-line for all GDM
- If 2-hour PPBS remains ≥ 120 mg/dL after MNT + exercise, start pharmacological therapy:
- Insulin - first drug of choice
- Metformin - also recommended (500 mg OD x 1 week, then 500 mg BD, max 2 g/day); discuss risks and benefits
- Blood glucose targets (SMBG):
- Fasting: < 95 mg/dL
- 1-hour postprandial: < 140 mg/dL
- 2-hour postprandial: < 120 mg/dL
Postpartum Screening (After GDM)
At 6-12 weeks postpartum, all women who had GDM should undergo a standard 75 g fasting 2-hour OGTT:
| 2-h Result | Interpretation |
|---|---|
| < 100 mg/dL | Euglycemic (normal) |
| 140-199 mg/dL | Prediabetes / IGT |
| ≥ 200 mg/dL | Overt Diabetes |
Women with IGT postpartum: manage with diet, exercise, or metformin, and repeat OGTT yearly.
Advantages of DIPSI
- No fasting required - least disruption to daily routine
- Single blood draw (at 2 hours only)
- Cost-effective and practical for resource-limited settings
- Can be done at the point of care with a calibrated glucometer
- Shown to reduce macrosomia rates, emergency C-sections, and serious perinatal morbidity when GDM is detected and treated
DIPSI vs. IADPSG - Quick Comparison
| Feature | DIPSI | IADPSG |
|---|---|---|
| Fasting required | No | Yes |
| Glucose load | 75 g | 75 g |
| Blood draws | 1 (at 2h) | 3 (fasting, 1h, 2h) |
| Cut-off | ≥ 140 mg/dL (2h) | Fasting ≥92, 1h ≥180, 2h ≥153 mg/dL |
| GDM diagnosed if | Any single value met | Any single value met |
| Preferred in | India / Low-resource settings | High-income countries |
A 2023 meta-analysis (PMID: 37407183) comparing DIPSI vs. IADPSG in Indian populations found reasonable diagnostic agreement between the two criteria.
Sources: FOGSI Good Clinical Practice Recommendations 2024; MoHFW/NHM Technical and Operational Guidelines for GDM; DIPSI Revised Guidelines 2023 (Seshiah et al., Int J Diabetes Dev Ctries)
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