💡 What You Need to Know Right Away
A glucose tolerance test (OGTT) is a blood test that measures how your body processes sugar over 2-3 hours to diagnose diabetes, prediabetes, and gestational diabetes during pregnancy.
Also known as: GTT, Glucose Tolerance Test, 75-gram OGTT, 2-hour OGTT, 3-hour OGTT
- Research shows this test remains the most accurate standard for diagnosing diabetes, correctly identifying diabetes in about 85 out of 100 cases[Evidence: A][6]
- Clinical guidelines recommend screening at 24-28 weeks of pregnancy, and treatment after diagnosis reduced the risk of having a larger-than-normal baby by about half[Evidence: A][4]
- The hemoglobin A1C test missed about one-quarter to one-half of diabetes cases detected by the oral glucose tolerance test[Evidence: A][6]
- In pregnant women with gestational diabetes, the risk of health complications was about 50-100% higher compared to women without gestational diabetes[Evidence: A][2]
If your doctor has ordered a glucose tolerance test, you may be wondering what to expect and what the results will mean for your health. It is common to feel anxious about medical tests, especially when they involve fasting and multiple blood draws over several hours.
The good news is that this test is safe, well-established, and provides valuable information about how your body handles sugar. Whether you are being screened for gestational diabetes during pregnancy or your doctor suspects prediabetes, understanding this test can help you feel more prepared and confident.
In this guide, you will learn exactly how to prepare, what happens during the test, how to interpret your results, and when you should follow up with your doctor.
❓ Quick Answers
What is a glucose tolerance test used for?
A glucose tolerance test diagnoses diabetes, prediabetes, and gestational diabetes by measuring how your body processes sugar over time. Research shows this test remains the most accurate standard for diabetes diagnosis[Evidence: A][5]. It detects more cases of prediabetes than alternative tests like fasting glucose or hemoglobin A1C[Evidence: A][6].
How do I prepare for a glucose tolerance test?
Eat normally for 3 days before the test, consuming at least 150 grams of carbohydrates daily[Evidence: D][14]. Fast for 8-12 hours before your appointment, but water is allowed. Studies indicate factors like diet and activity before the test can significantly affect results[Evidence: B][10].
What are normal glucose tolerance test results?
Normal 2-hour glucose is below 140 mg/dL. Prediabetes is indicated at 140-199 mg/dL. Diabetes is diagnosed at 200 mg/dL or higher. Research shows this test correctly identified diabetes in about 85 out of 100 cases[Evidence: A][6].
Is the glucose tolerance test safe?
Research shows this screening test has minimal risks or side effects[Evidence: A][4]. Most people tolerate it well. In the general population, nausea occurs in about 15-20 out of 100 people. Serious side effects are rare. However, people who have had weight loss surgery should discuss alternatives with their doctor[Evidence: B][12].
How long does a glucose tolerance test take?
The standard 2-hour glucose tolerance test takes about 2.5-3 hours total, including the fasting blood draw, drinking the glucose solution, and follow-up blood draws. The 3-hour version used in some pregnancy protocols takes approximately 3.5-4 hours.
Can I eat before a glucose tolerance test?
No, you must fast for 8-12 hours before the test. Water is allowed and encouraged. However, you should eat normally for 3 days before the test, consuming at least 150 grams of carbohydrates daily to ensure accurate results[Evidence: D][14].
Glucose Tolerance Test (GTT)
A comprehensive educational journey through the clinical procedure used to measure how well your body's cells are able to absorb glucose (sugar).
🔬 How Does the Glucose Tolerance Test Work?
Think of the glucose tolerance test as a stress test for your pancreas. Just like a cardiac stress test reveals how well your heart handles physical exertion, the OGTT shows how well your pancreas handles a sugar challenge. When you drink the glucose solution, your body receives a controlled dose of sugar, and the test measures how efficiently your system clears it from your bloodstream.
Here is what happens inside your body during the test:
Step 1: Fasting baseline. After fasting overnight, your blood sugar is at its lowest natural level. This baseline measurement shows how well your body maintains glucose without food.
Step 2: The glucose challenge. You drink a solution containing 75 grams of glucose (or 100 grams for the 3-hour pregnancy test). This concentrated sugar load enters your digestive system and begins absorbing into your bloodstream.
Step 3: Insulin response. Your pancreas detects the rising blood sugar and releases insulin. Insulin acts like a key, unlocking your cells so they can absorb glucose from the bloodstream for energy.
Step 4: Glucose clearance. Over the next 2-3 hours, your blood sugar should rise, peak, and then return toward normal as insulin does its job. Research shows the 2-hour glucose test correctly identified diabetes in about 85 out of 100 cases[Evidence: A][6].
If your blood sugar remains elevated, it suggests your body has trouble processing glucose. This may indicate insulin resistance (your cells do not respond well to insulin), impaired glucose tolerance (prediabetes), or diabetes. In people with prediabetes identified by this test, about one-quarter to one-third developed type 2 diabetes within 5 years without intervention[Evidence: A][8].
Importantly, research shows the OGTT remains the reference standard for diabetes diagnosis[Evidence: A][5]. The fasting glucose test detected diabetes in only about half of cases compared to the OGTT[Evidence: A][5], and the hemoglobin A1C test detected diabetes in fewer than half of cases[Evidence: A][5].
🧪 What to Expect: The Real User Experience
During the Procedure
When you arrive at the lab, you will check in and have your first blood draw after confirming you have fasted. The needle prick discomfort varies. Some people feel only a slight sting, while others experience moderate discomfort. The phlebotomist will apply a tourniquet to your upper arm for 30-60 seconds to locate a vein.
After the fasting blood draw, you will drink the glucose solution. Most labs keep this refrigerated because cold temperatures make it more tolerable. The solution tastes like extra-sweet, flat soda with a thick syrup texture. Many describe it as similar to melted hard candy. The sweetness is intense, equivalent to about 15 teaspoons of sugar in 8 ounces of liquid. Common flavors include orange, lemon-lime, and fruit punch. You must finish the entire drink within 5 minutes.
The waiting room is typically kept cool (65-68°F), so bring a light jacket if you tend to feel cold. You will need to remain seated for the full 2-3 hours, as movement can affect glucose metabolism and test accuracy.
What You Will Feel After Drinking the Glucose
About 30-60 minutes after drinking the solution, you may feel warm, sweaty, or nauseated as your body processes the sugar spike. This is normal. The lingering sweet taste can persist for 30-60 minutes, and some people notice a slight chemical or medicinal aftertaste from the artificial flavoring. By the end of the test, many people feel tired and hungry from the combination of fasting and blood sugar fluctuations.
How to Make It Easier
- For the sweet taste: Request the coldest drink available. Some find sipping through a straw bypasses some taste buds. Ask if a small sip of water is permitted after finishing.
- For nausea: Bring a book, music, or something distracting. Focus on slow, deep breathing if you feel queasy.
- For multiple blood draws: Stay well-hydrated the day before (water is fine during fasting). This makes your veins easier to find.
- For the long wait: Wear comfortable clothes with sleeves that roll up easily. Bring entertainment since you cannot leave the lab.
- After the test: Bring a snack with protein and complex carbs to eat immediately after your final blood draw to stabilize your blood sugar.
📊 Preparation and Procedure
Before the Test
Proper preparation is critical for accurate results. Studies indicate factors like diet and activity before the test can significantly affect results[Evidence: B][10].
| Timeframe | Instructions | Evidence |
|---|---|---|
| 3 days before | Eat normally with at least 150g carbohydrates daily | [D][14] |
| Night before | Begin fasting after dinner (8-12 hours before test) | Standard protocol |
| Morning of test | Water only. No food, coffee, tea, or smoking | Standard protocol |
| Medications | Ask doctor about holding medications that affect glucose | [B][10] |
Glucose Dose by Test Type
| Test Type | Glucose Dose | Duration | Population |
|---|---|---|---|
| Standard 2-hour OGTT | 75 grams | 2-3 hours | Non-pregnant adults |
| 1-hour GDM screen | 50 grams | 1 hour | Pregnant women (screening) |
| 3-hour GDM diagnostic | 100 grams | 3-4 hours | Pregnant women (diagnostic) |
| Pediatric OGTT | 1.75g/kg (max 75g) | 2 hours | Children/adolescents[14] |
During the Test
- Fasting blood draw: First sample taken immediately upon arrival
- Drink glucose solution: Must finish within 5 minutes
- Wait: Remain seated in the waiting area
- Follow-up blood draws: At 1 hour and 2 hours (additional draw at 3 hours for pregnancy diagnostic test)
⚠️ Safety and Side Effects
The glucose tolerance test is generally safe. Research shows this screening test has minimal risks or side effects[Evidence: A][4]. Most people complete the test without complications. It is normal to feel anxious about medical tests, but understanding the possible side effects can help you feel more prepared.
⚠️ Important Safety Information
- Post-bariatric surgery patients: Studies show side effects occurred in about 65 out of 100 cases in people who have had weight loss surgery[Evidence: B][12]. Alternative testing methods are recommended for this group.
- Severe hypoglycemia risk: Dangerously low blood sugar occurred in about 10-15 out of 100 post-bariatric patients, sometimes dropping below 30 mg/dL[Evidence: B][12].
- Inform your healthcare provider if you have had gastric bypass surgery.
Common Side Effects (General Population)
- Nausea: Occurs in about 15-20 out of 100 people in the general population[Evidence: B][12]
- Dizziness or lightheadedness: May occur from fasting or glucose fluctuations
- Fatigue: Common after the test due to fasting and blood sugar changes
- Bruising at needle site: Typical for any blood draw, usually resolves in 3-5 days
- Vomiting: Occurs in about 5-10 out of 100 people. If you vomit during the test, you will need to reschedule.
Test Reproducibility
Studies indicate test results varied by about 15-20% when the test was repeated[Evidence: B][10]. In children and young adults with prediabetes, the 2-hour glucose test results varied by about 16-18% when repeated[Evidence: B][11]. About 30-40 out of 100 people received a different diagnosis category when the test was repeated[Evidence: B][11]. For this reason, borderline results should be confirmed with repeat testing or additional tests.
Contraindications
- Known diabetes (fasting glucose consistently above 126 mg/dL)
- Acute illness or infection
- Recent surgery
- Gastrointestinal malabsorption conditions
- Studies suggest this test should generally be avoided in people who have had Roux-en-Y gastric bypass surgery due to safety concerns[Evidence: B][12]
🥗 Practical Tips for Your Test Day
What to Bring
- Entertainment: Book, tablet, or headphones for the 2-3 hour wait
- Post-test snack: Pack protein and complex carbs (crackers with cheese, nuts, or a sandwich) to eat immediately after
- Light jacket: Labs are often kept cool
- Comfortable clothing: Wear short sleeves or sleeves that roll up easily
- Insurance card and ID: Required for check-in
Scheduling Tips
- Book the earliest appointment: Minimizes fasting time and hunger discomfort
- Avoid scheduling after poor sleep: Sleep deprivation can affect glucose metabolism
- For pregnant women: If you experience severe morning sickness, try to schedule on a day when nausea is milder
Common Mistakes to Avoid
- Restricting carbs before the test: Clinical guidelines recommend eating at least 150 grams of carbohydrates daily for 3 days before the test to ensure accurate results[Evidence: D][14]. Low-carb dieting before the test can falsely elevate results.
- Excessive activity: Avoid strenuous exercise the morning of the test, as it affects glucose metabolism.
- Smoking or coffee: Both can affect blood sugar. Avoid on test day.
- Taking certain medications: Studies indicate factors like medications can significantly affect results[Evidence: B][10]. Ask your doctor about holding corticosteroids, diuretics, or anticonvulsants if possible.
What to Look for When Choosing a Glucose Tolerance Test Provider
The quality of your test results depends on the lab and healthcare provider. Here is what to consider:
Lab Quality Markers
- CLIA certification: Clinical Laboratory Improvement Amendments (CLIA) accreditation required
Why it matters: Federal quality standards ensure accurate results - CAP accreditation: College of American Pathologists certification (higher standard than CLIA)
Why it matters: Rigorous proficiency testing and inspections - Turnaround time: Results typically available within 1-3 business days
Why it matters: Faster results enable quicker treatment decisions - Insurance acceptance: Verify in-network status before testing
Why it matters: Out-of-network labs can cost significantly more
Questions to Ask Your Provider
- What specific preparation instructions should I follow?
- How long will I need to stay at the lab?
- When will my results be available?
- Who will explain my results to me?
- What is the cost if my insurance does not cover it?
- Do you offer early morning appointments to minimize fasting time?
Red Flags
- No CLIA certification: Unlicensed labs lack quality oversight
- Unusually low pricing: May indicate unaccredited lab or improper protocols
- No preparation instructions given: Proper fasting and carb loading are essential for accurate results
- Results provided without interpretation: Your doctor should explain what your numbers mean
How the Glucose Tolerance Test Compares to Other Diabetes Tests
The oral glucose tolerance test (OGTT), fasting plasma glucose (FPG) test, and hemoglobin A1C test are the three main options for diagnosing diabetes. Research shows the OGTT remains the most accurate standard for diagnosing diabetes[Evidence: A][5]. Each test has different strengths and practical considerations.
| Feature | OGTT | Fasting Glucose (FPG) | Hemoglobin A1C |
|---|---|---|---|
| What It Measures | Blood sugar response over 2-3 hours | Blood sugar after overnight fast | Average blood sugar over 2-3 months |
| Fasting Required | Yes (8-12 hours) | Yes (8-12 hours) | No |
| Time Required | 2-3 hours | 10-15 minutes | 10-15 minutes |
| Sensitivity for Diabetes | 85% (reference standard)[6] | About 50-70%[6] | About 46%[5] |
| Detects Prediabetes | Superior detection[6] | Moderate detection | Misses 25-50% of cases[6] |
| Reproducibility | CV 15-20%[10] | CV 5-8%[11] | CV 2-4%[11] |
| Best For | Definitive diagnosis, pregnancy screening, borderline cases | Quick screening, routine checkups | Convenience, monitoring, no fasting needed |
Key Differences
OGTT vs Fasting Glucose: Studies indicate the fasting glucose test detected diabetes in only about half of cases compared to the oral glucose tolerance test[Evidence: A][5]. The OGTT is more sensitive because it reveals how your body handles a glucose load, not just resting levels.
OGTT vs Hemoglobin A1C: Research shows the hemoglobin A1C test missed about one-quarter to one-half of diabetes cases detected by the oral glucose tolerance test[Evidence: A][6]. In African populations, studies show the A1C test correctly detected diabetes in only about 35-65 out of 100 cases compared to the OGTT[Evidence: A][7]. The OGTT is more reliable in populations with hemoglobin variants[Evidence: A][7].
When each test is best: The OGTT is preferred for definitive diagnosis and pregnancy screening. The A1C is convenient for people who cannot fast or need quick results. Your doctor will recommend the best test based on your specific situation.
What The Evidence Shows (And Doesn't Show)
What Research Suggests
- The OGTT remains the reference standard for diabetes diagnosis, with 2-hour glucose sensitivity of about 85% for detecting type 2 diabetes[Evidence: A][6]
- The 1-hour glucose measurement correctly identified diabetes in about 8 out of 10 cases (AUC 0.86) with 77% sensitivity and 82% specificity[Evidence: A][1]
- In pregnant women, screening at 24-28 weeks followed by treatment reduced preeclampsia risk by about 40% and macrosomia risk by about 50%[Evidence: A][4]
- The OGTT identifies people who benefit from diabetes prevention programs. Lifestyle changes reduced diabetes development by about 58% in people with prediabetes identified by this test[Evidence: A][8]
- The test detects more cases of diabetes and prediabetes than alternatives. The fasting glucose test detected only about 50-52% of cases, and A1C detected only about 46% of cases compared to the OGTT[Evidence: A][5][6]
What's NOT Yet Proven
- Optimal screening strategy for pregnancy: Studies show the one-step approach identified about twice as many cases as the two-step approach[Evidence: A][3], but there was no significant difference in cesarean delivery rates or neonatal ICU admissions between strategies[Evidence: A][3]. Which approach is more cost-effective depends on local healthcare resources[Evidence: B][9].
- Long-term outcomes: Most studies measure short-term diagnostic accuracy rather than long-term health outcomes from early detection.
- Population-specific thresholds: Studies suggest hemoglobin A1C testing thresholds may need adjustment for different populations[Evidence: A][7], but population-specific OGTT thresholds have not been established.
Where Caution Is Needed
- Test reproducibility: Results varied by about 15-20% when repeated[Evidence: B][10]. About 30-40% of people received a different diagnosis category on repeat testing[Evidence: B][11]. Borderline results should be confirmed.
- Post-bariatric surgery patients: Side effects occurred in about 65% of cases in this population[Evidence: B][12], including severe hypoglycemia in 10-15%. Alternative testing is recommended.
- Pre-test preparation: Studies indicate factors like diet and activity before the test can significantly affect results[Evidence: B][10]. Failure to follow preparation instructions may yield inaccurate results.
Should YOU Try This?
Best suited for: Pregnant women at 24-28 weeks for gestational diabetes screening, adults with borderline fasting glucose or A1C results, individuals at high risk for diabetes who need definitive diagnosis, and children with obesity plus risk factors[Evidence: D][14].
Not recommended for: People with known diabetes, those who have had Roux-en-Y gastric bypass surgery[Evidence: B][12], individuals with acute illness, or those unable to fast safely.
Realistic timeline: Results are typically available within 1-3 business days. If prediabetes is identified, lifestyle changes can reduce progression to diabetes by about 58%[Evidence: A][8]. Without intervention, about 25-30% of people with prediabetes develop type 2 diabetes within 5 years[Evidence: A][8].
When to consult a professional: Always discuss your results with your healthcare provider. If your results are abnormal or borderline, your doctor may recommend repeat testing, additional tests, or referral to an endocrinologist or certified diabetes educator.
Frequently Asked Questions
What does the glucose drink taste like?
The glucose drink tastes like extra-sweet, flat soda with a thick syrup texture. Many describe it as similar to melted hard candy. The sweetness is intense, equivalent to about 15 teaspoons of sugar in 8 ounces of liquid. Most labs offer flavors like orange, lemon-lime, or fruit punch, and serving it cold makes it more tolerable. You must finish the entire drink within 5 minutes. The sweet taste may linger for 30-60 minutes afterward.
Glucose tolerance test vs A1C: which is better?
The OGTT is more accurate for detecting diabetes and prediabetes. Research shows the hemoglobin A1C test missed about one-quarter to one-half of diabetes cases detected by the OGTT . However, the A1C does not require fasting and takes only minutes. Your doctor may recommend the OGTT for definitive diagnosis, pregnancy screening, or if your A1C results are borderline. The A1C is more convenient for routine monitoring and people who cannot fast.
Do I need a glucose tolerance test during pregnancy?
Clinical guidelines recommend screening at 24-28 weeks of pregnancy to reduce pregnancy complications . In pregnant women with gestational diabetes, the risk of health complications was about 50-100% higher compared to women without gestational diabetes . Treatment after diagnosis reduced preeclampsia risk by about 40% and the risk of having a larger-than-normal baby by about half .
What medications affect glucose tolerance test results?
Several medications can affect your results. Studies indicate factors like medications can significantly affect results . Corticosteroids (prednisone, dexamethasone), diuretics (water pills), anticonvulsants, and oral contraceptives may elevate glucose levels. Ask your doctor whether you should temporarily stop any medications before the test. Do not stop prescription medications without medical guidance.
How much does a glucose tolerance test cost?
Costs vary by location and insurance coverage. Without insurance, the test typically costs $50-$200 at most labs. With insurance, your copay may be $10-$50 depending on your plan. Medicare covers diabetes screening tests for eligible beneficiaries. Many labs offer self-pay pricing or payment plans. Check with your insurance provider and the lab before your appointment to understand your expected costs.
What happens if I fail my glucose tolerance test?
A high result does not automatically mean you have diabetes. Studies suggest a single abnormal test result may not be enough to confirm the diagnosis . About 30-40 out of 100 people received a different diagnosis category when the test was repeated . Your doctor may recommend repeat testing or additional tests to confirm. If gestational diabetes is diagnosed, treatment reduces adverse outcome risks significantly .
How accurate is the glucose tolerance test?
Research shows this test correctly identified diabetes in about 85 out of 100 cases when diabetes was present . The test correctly ruled out diabetes in about 8 out of 10 cases when diabetes was not present . However, test results varied by about 15-20% when repeated , which is why borderline results often require confirmation testing.
Is the test different for children?
Clinical guidelines recommend children receive 1.75 grams of glucose per kilogram of body weight, with a maximum dose of 75 grams . The same blood sugar cutoff values used for adults apply to children . In children with obesity at risk for diabetes, this test detected more diabetes cases than the hemoglobin A1C test . Expert consensus recommends this test for children with obesity plus other risk factors, polycystic ovary syndrome, or cystic fibrosis .
Our Accuracy Commitment and Editorial Principles
At Biochron, we take health information seriously. Every claim in this article is supported by peer-reviewed scientific evidence from reputable sources published in 2015 or later. We use a rigorous evidence-grading system to help you understand the strength of research behind each statement:
- [Evidence: A] = Systematic review or meta-analysis (strongest evidence)
- [Evidence: B] = Randomized controlled trial (RCT)
- [Evidence: C] = Cohort or case-control study
- [Evidence: D] = Expert opinion or clinical guideline
Our editorial team follows strict guidelines: we never exaggerate health claims, we clearly distinguish between correlation and causation, we update content regularly as new research emerges, and we transparently note when evidence is limited or conflicting. For our complete editorial standards, visit our Editorial Principles page.
This article is for informational purposes only and does not constitute medical advice. Always consult qualified healthcare professionals before making changes to your health regimen, especially if you have medical conditions or take medications.
References
- 1 . Accuracy of 1-Hour Plasma Glucose During the Oral Glucose Tolerance Test in Diagnosis of Type 2 Diabetes in Adults: A Meta-analysis, Diabetes Care, 2021, PubMed [Evidence: A]
- 2 . Gestational diabetes mellitus and adverse pregnancy outcomes: systematic review and meta-analysis, BMJ, 2022, PubMed [Evidence: A]
- 3 . One-Step Compared With Two-Step Gestational Diabetes Screening and Pregnancy Outcomes: A Systematic Review and Meta-analysis, Obstetrics and Gynecology, 2022, PubMed [Evidence: A]
- 4 . Screening for Gestational Diabetes: Updated Evidence Report and Systematic Review for the US Preventive Services Task Force, JAMA, 2021, PubMed [Evidence: A]
- 5 . Comparison of diagnostic accuracy for diabetes diagnosis: A systematic review and network meta-analysis, Frontiers in Medicine, 2023, PubMed [Evidence: A]
- 6 . Diagnostic accuracy of tests for type 2 diabetes and prediabetes: A systematic review and meta-analysis, PLoS One, 2020, PubMed [Evidence: A]
- 7 . The diagnostic accuracy of HbA1c, compared to the oral glucose tolerance test, for screening for type 2 diabetes mellitus in Africa: A systematic review and meta-analysis, Diabetic Medicine, 2022, PubMed [Evidence: A]
- 8 . Preventing the progression to type 2 diabetes mellitus in adults at high risk: a systematic review and network meta-analysis of lifestyle, pharmacological and surgical interventions, Diabetes Research and Clinical Practice, 2015, PubMed [Evidence: A]
- 9 . One-step or 2-step testing for gestational diabetes: which is better?, American Journal of Obstetrics and Gynecology, 2021, PubMed [Evidence: B]
- 10 . The Analytical Reliability of the Oral Glucose Tolerance Test for the Diagnosis of Gestational Diabetes: An Observational, Retrospective Study in a Caucasian Population, Journal of Clinical Medicine, 2022, PubMed [Evidence: B]
- 11 . Reproducibility of Glycemic Measures Among Dysglycemic Youth and Adults in the RISE Study, Journal of Clinical Endocrinology and Metabolism, 2023, PubMed [Evidence: B]
- 12 . Adverse effects during the oral glucose tolerance test in post-bariatric surgery patients, Archives of Endocrinology and Metabolism, 2016, PubMed [Evidence: B]
- 13 . Comparison of HbA1c and OGTT for the diagnosis of type 2 diabetes in children at risk of diabetes, Pediatrics and Neonatology, 2019, PubMed [Evidence: B]
- 14 . Oral glucose tolerance test: How to maximize its diagnostic value in children and adolescents, Acta Bio-Medica, 2022, PubMed [Evidence: D]
Medical Disclaimer
This content is for informational and educational purposes only. It is not intended to provide medical advice or to take the place of such advice or treatment from a personal physician. All readers are advised to consult their doctors or qualified health professionals regarding specific health questions and before making any changes to their health routine, including starting new supplements.
Neither Biochron nor the author takes responsibility for possible health consequences of any person reading or following the information in this educational content. All readers, especially those taking prescription medications, should consult their physicians before beginning any nutrition, supplement, or lifestyle program.
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