Glucose Estimation 2.5 Hours Test
Short Name: Glucose 2.5H Test
Also known as: 2.5-hour glucose tolerance test, OGTT 2.5 hours
Glucose Estimation 2.5 Hours Test test available at DNA Labs India for ₹913. Uses Hexokinase method, Strip test on Plasma and urine samples. Results in Reports are typically available within 24 hours.. Free home collection in 300+ cities across India.
🩺 Medically Reviewed By
Dr Pasupathy Arumugam
Consultant Pathologist · Reg: 21521
Last reviewed: September 7, 2026
Overview
To diagnose diabetes mellitus, assess glucose tolerance, and monitor glucose metabolism disorders.
- Test Code
- 670
- Price
- ₹913
- Sample Type
- Plasma and urine
- Result Time
- Reports are typically available within 24 hours.
- Fasting Required
- Yes (8 hours)
- Method
- Hexokinase method, Strip test
Sample Collection
Fast overnight for 8-12 hours. Avoid food, beverages except water, and strenuous activity. Inform the lab about any medications.
Method: Venipuncture for blood, clean-catch urine collection
Laboratory Analysis
A baseline blood and urine sample will be collected. You will consume a glucose solution, and additional samples will be taken at specified intervals (0.5, 1.0, 1.5, 2.0, and 2.5 hours).
Report Delivery
Resume normal activities and diet. Monitor for any discomfort such as dizziness or nausea.
Timeline: Reports are typically available within 24 hours.
Patient Instructions
About This Test
Who Should Get This Test
To diagnose diabetes mellitus, assess glucose tolerance, and monitor glucose metabolism disorders.
How to Prepare
- Fast for 8-12 hours before the test
- Bring identification and previous medical records
- Wear loose clothing for easy blood draw
- Inform staff about any allergies or conditions
Doctor's Notes
Reviewed by Dr Pasupathy Arumugam — MBBS, MD (Pathology) · Reg. No. 21521
"This test is vital for early diabetes diagnosis and monitoring glucose metabolism. Timely intervention can prevent serious complications like neuropathy and retinopathy."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Sample Stability
- Non-fasting sample
- Hemolyzed or clotted blood sample
- Improperly labeled specimen
- Insufficient sample volume
Understanding Your Results
Normal glucose tolerance
Level: Fasting glucose 70-100 mg/dL
Prediabetes (impaired fasting glucose)
Level: Fasting glucose 100-125 mg/dL
Diabetes mellitus
Level: Fasting glucose ≥126 mg/dL
Normal glucose tolerance
Level: 2.5-hour glucose <140 mg/dL
Impaired glucose tolerance
Level: 2.5-hour glucose 140-199 mg/dL
Diabetes mellitus
Level: 2.5-hour glucose ≥200 mg/dL
If glucose levels are abnormal, or if you experience persistent symptoms like excessive thirst, frequent urination, or unexplained weight loss, consult an endocrinologist or physician.
Limitations
- ⚠Not suitable for gestational diabetes screening
- ⚠Requires strict patient preparation
- ⚠May not reflect daily glucose fluctuations
- ⚠Results can be affected by acute illness
Risks & Considerations
- ●Minor bruising or pain at the needle site
- ●Rare risk of infection
- ●Dizziness or fainting during blood draw
- ●Nausea from glucose solution
Interfering Factors
- ●Recent meals or snacks
- ●Medications such as corticosteroids or diuretics
- ●Physical activity or stress
- ●Illness or infection
- ●Alcohol consumption
Compare With Similar Tests
| Test | Glucose Estimation 2.5 Hours Test | Fasting Blood Glucose Test | HbA1c Test | Random Blood Glucose Test | 3-hour Glucose Tolerance Test |
|---|---|---|---|---|---|
| Comparison | Glucose Estimation 2.5 Hours Test |
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