Glucose Challenge Test (GCT)

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The Glucose Challenge Test (GCT) is a screening test used during pregnancy to identify the risk of gestational diabetes mellitus (GDM).

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Test Details

Also Known As

GCT Test, Glucose Challenge Screening Test, 50g Glucose Test, Gestational Diabetes Screening Test, One-Hour Glucose Test

Sample Type

Blood

Gender

Female

Age Group

Adults (pregnant women)

Pathology

Test Code

The Glucose Challenge Test (GCT) is a non-fasting screening test commonly performed between 24–28 weeks of pregnancy to assess how the body processes glucose. In this test, a pregnant woman consumes a 50-gram oral glucose solution, and blood glucose levels are measured one hour later.

The GCT does not diagnose diabetes but helps identify women who may be at risk of gestational diabetes mellitus (GDM). If the result is above the recommended cut-off, a confirmatory test such as the Oral Glucose Tolerance Test (OGTT) is advised. Early detection of gestational diabetes is crucial to prevent complications like large birth weight, preterm delivery, preeclampsia, and neonatal hypoglycemia.

Recommended Tests

Frequently Asked Questions

It is used to screen for gestational diabetes during pregnancy.

No, fasting is not required.

Usually between 24 and 28 weeks of gestation.

A follow-up Oral Glucose Tolerance Test (OGTT) is recommended.

About one hour after consuming the glucose solution.

Yes, it is safe and routinely performed during pregnancy.

Glucose Challenge Test (GCT)