Glucose tolerance test

The Glucose Tolerance test is a test performed on pregnant women to check the gestational diabetes. Gestational diabetes is a type of diabetes, which usually starts at the time of pregnancy in women.

During the test, first the fasting blood sugar is taken, post checking the blood sugar, 75gm glucose is given to the pregnant women. Post the consumption of glucose, after two hours, blood sugar value is taken from 75gm of glucose.

The test is easy to be performed and the presence of advanced diagnostic tools and knowledgeable experts at Fortis ensure accurate and timely diagnosis of Gestational diabetes in prospective mothers.


Why it's done? How to Prepare for the Procedure: Expected Results from the Procedure: FAQ Section:

The test is usually performed to check for Gestational diabetes. This test is mostly performed in the time period between 24th and 28th week of pregnancy. Though the test is typically performed in the aforementioned time-period, there are certain cases, where the test can be performed earlier in pregnant mothers. Some of the scenarios when the test can be performed early are family history of diabetes, obesity, previous history of GDM, history of PCOD.

It is a routine screening test performed for all pregnant women. In few cases, if the woman is known to have diabetes, the test is not performed.

The test is generally safe and does not cause any side effects. However, few women can experience vomiting and gastric problems.

This test is generally done on an empty stomach or randomly.

These are the ranges for blood sugar for normal results:

Before Test (Fasting): Less than 95 mg/dL

2 hours after the test:  Less than 140 mg/dL

If the results from the 2-hour Tolerance test are coming out to be abnormal, then the physician could diagnose the prevalence of Gestational diabetes in the pregnant mother. In such cases of a confirmed diagnosis, the doctor can recommend certain diet changes and can prescribe insulin to control the blood sugar levels in the prospective mothers.

Q1. What are the implications of having Gestational diabetes during pregnancy for the unborn child or the mother?

A1. Gestational diabetes does not affect mothers in the long run, but it can affect baby, the baby can be diagnosed with macrosomia. As a result of macrosomia, there is an increase in the chances of caesarian section compared to normal delivery. Once the baby is born, it can have hypoglycemia, hypocalcaemia, hypomagnesaemia, prolonged jaundice and NICU stay.

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