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.
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I'm always amazed when I hear how much time quarterback Peyton Manning puts in at practice. More than 15 seasons playing NFL football at the highest level and he still finds areas in his game that require fixing. It's been 10 years for us in the game of type 1 diabetes and I still have so much to learn. Not to compare my diabetes management success to Peyton Manning's football success. If anything, I'm more like Peyton's brother, Eli. I...