Oral Glucose Tolerance Test (OGTT)

The Oral Glucose Tolerance Test (OGTT) at Pamel Laboratories is a detailed diagnostic test used to assess how your body processes glucose (sugar) over a period of time. It is most commonly used to diagnose diabetes, pre-diabetes, and gestational diabetes (during pregnancy). The test involves measuring blood glucose levels before and at intervals after consuming a standard glucose solution.

This test helps detect abnormalities in glucose metabolism that might not be apparent with a fasting glucose test alone.

What the Test Measures:

• Blood sugar levels before and after consuming a measured amount of glucose

• Evaluates how efficiently your body clears glucose from the bloodstream

Purpose of the Test:

• Diagnose:

  • Type 2 diabetes

  • Pre-diabetes (impaired glucose tolerance)

  • Gestational diabetes (in pregnant women)

• Monitor individuals at risk for:

  • Insulin resistance

  • Polycystic Ovary Syndrome (PCOS)

  • Obesity or metabolic syndrome

Test Procedure:

1. Fasting Sample: Blood sample taken after an overnight fast (8–12 hours)

2. Glucose Drink: You’ll consume a 75g glucose solution (100g in pregnancy)

3. Timed Samples: Blood samples taken at 1 hour, 2 hours, and sometimes 3 hours post-consumption

Sample Type: Blood sample (serum or plasma)
Fasting Required: Yes, 8–12 hours before the test
Duration: 2–3 hours
Turnaround Time: Same day or next day (depending on intervals requested)

Interpretation Guide (for 2-hour sample):

• Normal: <140 mg/dL (7.8 mmol/L)

• Pre-diabetes: 140–199 mg/dL (7.8–11.0 mmol/L)

• Diabetes: ≥200 mg/dL (≥11.1 mmol/L)