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Glucose Challenge Test - Gestational (2 Step Procedure)

The Glucose Challenge Test (GCT) - Gestational (2 Step Procedure) is a diagnostic tool used to screen pregnant women for gestational diabetes, a type of diabetes that develops during pregnancy. The test involves measuring how effectively the body processes glucose, which is crucial for both the mother's and baby's health. The two-step procedure includes an initial screening followed by a more detailed glucose tolerance test for those who have high glucose levels in the first step.


  • Test NameGlucose Challenge Test - Gestational (2 Step Procedure)
  • Sample TypeBlood
  • Preparations RequiredNo fasting is required for the first step, but fasting for at least 8 hours is necessary for the second step. Pregnant women should continue taking any prescribed medications and consult their doctor for any specific instructions.
  • Report Time4 hours

Gestational diabetes can affect the mother’s and baby's health during and after pregnancy. It increases the risk of complications such as high birth weight, premature birth, and respiratory problems for the baby, and type 2 diabetes and high blood pressure for the mother. Therefore, it is crucial to detect and manage gestational diabetes early to ensure the well-being of both mother and baby.

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Sample Collection by Phlebotomist
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Reporting of the sample at lab
Reporting of the sample at lab
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Frequently Asked Questions

The first step is the Glucose Challenge Screening, where you will drink a liquid that contains glucose and have your blood drawn after an hour to measure blood sugar levels. If your blood sugar is higher than normal, you will move to the second step, the Glucose Tolerance Test (GTT), which requires fasting and several blood draws after consuming a higher concentration of glucose drink.

The two-step process is essential for accurately diagnosing gestational diabetes. The initial screening helps identify those who may have gestational diabetes, and the second step confirms the diagnosis.

In the initial screening, a blood sugar level below 140 mg/dL is generally considered normal. In the second step, fasting levels should be below 95 mg/dL, and levels should be below 180 mg/dL 1 hour after drinking the glucose solution and below 153 mg/dL after 2 hours.

During the first step, you will drink a sweet liquid and have your blood drawn after an hour. If your levels are high, you will be asked to come back for the second step, which involves fasting overnight, drinking a more concentrated glucose solution, and having your blood drawn several times.

For the first step, no special preparation is needed. For the second step, you should fast for at least 8 hours before the test.

Abnormal results may indicate gestational diabetes. Your doctor will guide you on the next steps, which could include dietary changes, exercise, and, in some cases, medication.

It can increase the risk of complications such as high birth weight, early birth, and C-section. For the mother, it increases the risk of developing type 2 diabetes later in life.

Eating a balanced diet, engaging in regular physical activity, and monitoring blood glucose levels are key in managing gestational diabetes.

While you can’t control all risk factors for gestational diabetes, maintaining a healthy weight, eating well, and staying active can reduce your risk.

Sometimes, lifestyle changes are not enough, and medication such as insulin may be necessary to control blood sugar levels.

Blood sugar levels often return to normal after the baby is born, but it’s important to continue monitoring as there is an increased risk of developing type 2 diabetes.

Yes, breastfeeding is encouraged as it can benefit both mother and baby, and can help regulate blood sugar levels.

It's important to manage gestational diabetes effectively to minimize risks to your baby. Your doctor will monitor the baby's growth and health closely.

Not necessarily. The decision for a C-section will depend on various factors such as the baby's size and the mother's health.

By understanding the importance of the Glucose Challenge Test and taking steps to manage gestational diabetes, you can protect both your health and that of your baby. Remember that communication with your doctor is key in ensuring a healthy pregnancy and delivery.

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