Glucose Tolerance Test + Urine (GTT)–(Glucose-Fasting, Glucose-1hr, Glucose Postprandial, Glucose-Fasting (Urine), Glucose-1hr (Urine), Glucose Postprandial (Urine)

Description

Glucose Tolerance Test (GTT) – Comprehensive Screening for Glucose Levels in Plasma and Urine

The Glucose Tolerance Test (GTT) with Urine Screening from Lab Tests Dubai is a comprehensive metabolic evaluationthat assesses how your body processes glucose after a controlled sugar load. This advanced test measures plasma glucose at fasting, 1-hour, and 2-hour intervals—the gold standard for diagnosing diabetes and prediabetes—and includes optional urine glucose testing to detect glucosuria, a sign of persistent hyperglycemia.

Using enzymatic spectrophotometry for plasma and dipstick/chemical analysis for urine, this dual-sample test delivers highly accurate results within just 1 day, making it essential for:

• Diagnosing type 2 diabetes and prediabetes
• Screening for gestational diabetes (GDM)
• Evaluating insulin resistance and metabolic syndrome
• Monitoring patients with renal glycosuria or kidney disease

Available with home blood and urine collection, Lab Tests Dubai makes metabolic testing accurate, convenient, and patient-friendly—ideal for pregnant women, diabetics, and high-risk individuals.

Why You Need This Test

If you’re at risk for diabetes or insulin resistance, this test could prevent long-term complications.

You need the GTT with Urine Screening if:

• You’re pregnant and due for gestational diabetes screening (24–28 weeks)
• You have PCOS, obesity, or a family history of diabetes
• You’ve had abnormal fasting glucose or HbA1c
• You experience symptoms of blood sugar imbalance (fatigue, thirst, frequent urination)
• You notice sweet-smelling urine or ants around urine (possible glucosuria)
• You’re being evaluated for renal glycosuria or kidney dysfunction

While plasma glucose is diagnostic, urine glucose can indicate:

• Blood sugar consistently >180 mg/dL
• Kidney threshold issues
• Poor diabetes control

This test gives you both diagnostic precision and real-world insight.

Symptoms That Indicate This Test

Consider the GTT with Urine Screening if you experience:

✅ For Diabetes & Prediabetes:

• Excessive thirst or frequent urination
• Unexplained fatigue or low energy
• Increased hunger despite eating
• Blurred vision
• Slow-healing wounds or frequent infections

✅ For Glucosuria (Sugar in Urine):

• Sweet or fruity-smelling urine
• Presence of ants or insects near urine
• Nocturia (nighttime urination)
• Unexplained dehydration

✅ For Gestational Diabetes:

• No symptoms (often asymptomatic)
• High fasting glucose in prenatal labs
• Large baby (macrosomia) on ultrasound

These signs may point to impaired glucose tolerance—and this test provides definitive diagnosis.

Natural Production: How Glucose Metabolism Works

After eating, carbohydrates are broken down into glucose, which enters the bloodstream.

In response, the pancreas releases insulin, which helps cells absorb glucose for:

• Immediate energy
• Storage as glycogen (liver/muscles)
• Conversion to fat (if excess)

But in insulin resistance or pancreatic dysfunction:

• Cells don’t respond well to insulin
• Glucose stays elevated longer
• When blood glucose exceeds renal threshold (~180 mg/dL), glucose spills into urine (glucosuria)

The GTT measures:

• Fasting glucose → Baseline insulin sensitivity
• 1-hour & 2-hour glucose → Peak and recovery response
• Urine glucose → Confirms persistent hyperglycemia

Abnormal levels indicate prediabetes, diabetes, or renal issues.

What Happens If Untreated? Risks of Ignoring Glucose Intolerance

Ignoring abnormal GTT results can lead to:

⚠️ Type 2 Diabetes – progression from prediabetes
⚠️ Gestational Diabetes Complications –

• Large baby → C-section risk
• Preterm birth
• Neonatal hypoglycemia
• Higher risk of type 2 diabetes later
  ⚠️ Cardiovascular Disease – from chronic high glucose
  ⚠️ Kidney Damage (Nephropathy) – glucose damages glomeruli
  ⚠️ Nerve & Vision Damage – over time

Early detection via GTT allows for:

• Diet and lifestyle changes
• Metformin (if needed)
• Insulin therapy in GDM

One test can protect both mother and baby.

How to Prepare for the Test

To ensure accurate results:

✅ Fast for 8–12 hours (water allowed) – no food or drink except water
✅ Avoid alcohol and caffeine 24 hours before
✅ No smoking or strenuous exercise before the test
✅ Continue medications unless instructed otherwise – inform your doctor
✅ Rest during the test – avoid walking or stress

Procedure:

1. Fasting blood draw (Plasma Glucose)
2. First-morning urine sample (for baseline)
3. Drink 75g glucose solution (sweet, syrupy drink)
4. Wait exactly 1 hour, then 2 hours – no eating, drinking, or smoking
5. Second and third blood draws at 1-hour and 2-hour marks
6. Urine samples collected at each interval (optional)

Our trained team ensures a smooth experience—available at clinics or via home collection with on-site testing.

Test Overview: Enzymatic & Dipstick Methodology

• Plasma Glucose: Enzymatic Spectrophotometry (Glucose Oxidase)
• Urine Glucose: Dipstick / Chemical Test (Glucose Oxidase)
  | Turnaround Time (TAT) | 1 Day | | Category | Diabetes & Metabolic Health | | Purpose | Diagnose diabetes, prediabetes, gestational diabetes, detect glucosuria | | Testing Location | Lab Tests Dubai – Accredited Labs & Home Collection Across UAE |

Interpretation (WHO Criteria – 75g OGTT):

• Fasting:
  • <100 mg/dL → Normal
  • 100–125 mg/dL → Prediabetes
  • ≥126 mg/dL → Diabetes
• 2-Hour:
  • <140 mg/dL → Normal
  • 140–199 mg/dL → Prediabetes
  • ≥200 mg/dL → Diabetes
• Urine Glucose:
  • Positive → Blood glucose likely >180 mg/dL
  • Negative → Glucose under renal threshold

Results are reported with clinical notes and reference ranges.

FAQs About the GTT with Urine Screening

Q: Is urine glucose testing diagnostic?
A: No. It’s supportive only. Diagnosis is based on plasma glucose levels.

Q: Can I drink water during the test?
A: Yes. Water is allowed, but no other drinks or food.

Q: Can I walk around during the wait?
A: No. Stay seated—physical activity affects glucose metabolism.

Q: Can I book without a doctor’s referral?
A: Yes! Lab Tests Dubai allows direct online booking—ideal for proactive screening.

Q: How will I get results?
A: A secure digital report is emailed within 24 hours, including all plasma and urine glucose readings.

Q: Is this test covered by insurance?
A: Yes. GTT is medically necessary—fully covered by all UAE insurers, especially during pregnancy.

If you’re at risk for diabetes or glucosuria, the Glucose Tolerance Test with Urine Screening gives you the most complete picture of your glucose metabolism in just one day.