Webster's New World Medical Dictionary

glucose, fasting blood
See 
fasting blood 
glucose.
glucose tolerance test
A test of carbohydrate
metabolism that is used primarily in the diagnosis of
type II diabetes and gestational diabetes. Abbreviated
GTT. After the patient has fasted overnight, but before
breakfast, a specific amount of glucose is given by
mouth, and the blood levels of this sugar are meas-
ured every 30–60 minutes. The GTT result depends
on a number of factors, including the ability of the
intestines to absorb glucose, the power of the liver to
take up and store glucose, the capacity of the pan-
creas to produce insulin, and the amount of “active”
insulin.
glucose-6-phosphate dehydrogenase
See
G6PD.
glucosylceramidosis
See 
Gaucher disease.
glucuronosyltransferase, UDP-
A liver enzyme
that is essential to the disposal of bilirubin. An
abnormality of UDP-glucuronosyltransferase results
in a condition called Gilbert syndrome. See also
Gilbert syndrome.
gluteal
Pertaining to the buttocks region, which
is formed by the gluteus maximus, gluteus medius,
and gluteus minimus muscles.
gluten
A protein that is found in wheat and
related grains. Gluten can be found in a large vari-
ety of processed foods, including soups, salad
dressings, and natural flavorings. Unidentified
starches, hydrolyzed proteins, and binders and
fillers used in medications or vitamins can be
unsuspected sources of gluten. People with celiac
sprue, Crohn’s disease, or related disorders may
need to avoid gluten products. See also 
gliadin.
gluten enteropathy
See 
celiac sprue.
glycemic index
An indicator of the rapidity and
extent to which carbohydrate-containing foods raise
the blood glucose levels in the two hours after con-
sumption. Foods containing carbohydrates that
break down most quickly during digestion have the
highest glycemic index. Also called the dietary
glycemic index. See also 
glucose.