Blood Tests for Diabetes Diagnosis: Glucose Challenge

Blood Tests for Diabetes Diagnosis: Glucose Challenge

Also known as: GCT; 50 gram glucose challenge; one-hour glucose screening test.

What is it? A screening test that measures blood glucose levels one hour after 50 grams of a glucose solution has been consumed (an extremely sweet drink). If the GCT is elevated, it indicates the need for further testing.

Why is this test performed? To screen for gestational diabetes in pregnant women considered "at risk."

How frequently should this test be performed? Once. If results are abnormal and glucose levels elevated, it should be followed up by a 3-hour oral glucose tolerance test (OGTT).

What is the "normal" range for results? Normal values are 140 mg/dl or less.

What do abnormal results mean? A glucose threshold value >140 mg/dl (7.8 mmol/l) means that gestational diabetes is a possibility and an OGTT is indicated.

Last Modified Date: May 24, 2013

All content on dLife.com is created and reviewed in compliance with our editorial policy.

Sign up for FREE dLife Newsletters

dLife Membership is FREE! Get exclusive access, free recipes, newsletters, savings, and much more! FPO

Congratulations!
You are subscribed!
Congratulations!
You are subscribed!
Congratulations!
You are subscribed!
131 Views 0 comments
by Lindsey Guerin
Lows are really nothing new to me. In the past (almost) 22 years, I've experienced every variety of low blood sugar. Two seizures, multiple black outs, the "I'm fine" at 32, the nauseating 85, and everything in between. That certainly doesn't mean that I'm used to them or that each low doesn't feel like a new and treacherous journey. They still scare me. They still annoy me. And they still overrun my life at times. Since I've hit the gym and the calorie counting on an aggressive...