Oral Glucose Tolerance Test (OGTT)

The Oral Glucose Tolerance Test (OGTT) is a diagnostic test that evaluates how your body processes sugar by measuring blood glucose levels before and after consuming a glucose solution.

It is commonly used to screen for or diagnose diabetes, including type 2 diabetes.

OGTT test is especially useful in the evaluation, screening and diagnosis of diabetes during pregnancy (Gestational Diabetes Mellitus -GDM)

Indications of the OGTT Test

– Screening for diabetes, prediabetes, impaired glucose tolerance
– Diagnosing type 2 diabetes
– Detecting gestational diabetes
– Assessing insulin resistance

Test Procedure

• The oral glucose test depends on measuring your blood sugar levels at 30-minute intervals after swallowing a known quantity of glucose solution. This is usually 75g or 100g in pregnancy.
• The blood sugar are measured by fingerprick blood at time 0min, 30min, 1hr, 1hr 30min, and 2hr mark
• The measured blood sugar values are compared with expected normal values to determine any abnormality.

Patient Preparation/Instructions

– Fasting: Fast for at least 8 hours before the test (overnight fasting).
– Medications: Inform your healthcare provider about any medications you are taking.
– Activities: Avoid smoking and strenuous exercise before the test.
– Follow Instructions: Adhere to any specific instructions provided by your healthcare provider.

Typical Reference Values (mmol/L) for OGTT Test

– Fasting: Greater than 7 mmol/L indicates diabetes.
– 2-Hour Post-Glucose Load
– Normal: Less than 7.8 mmol/L (140 mg/dL)
– Impaired Glucose Tolerance: 7.8-11 mmol/L (140-199 mg/dL)
– Diabetes: 11.1 mmol/L or higher (200 mg/dL)

Turnaround Time

The turnaround time for the Oral Glucose Tolerance Test (OGTT) results is usually within a few hours after the test is conducted.

Order OGTT Test

To order the Oral Glucose Tolerance Test (OGTT), simply click the “Order Test” button and add it to your cart. This test is essential for screening, diagnosing, and managing various forms of diabetes, providing valuable insights into how your body processes glucose.

The OGTT test is available from our laboratory in Kilimani, Upperhill area. Please note this test can only be done in person.

To view all the tests used in the management of diabetes, click here