Q. What Do my Oral Glucose Tolerance Test Results Mean? I had an Oral Glucose Tolerance Test last week. I am 26 weeks pregnant. The results I got are 132 mg/dL. What does this mean? A. If your blood glucose level was greater than 130 mg/dL, your provider will likely recommend you take another diabetes screening test that requires you to fast (not eat anything) before the test. During this second test, called the 100-gram oral glucose tolerance test, your blood glucose level will be tested four times during a three-hour period after drinking the cola-like drink. If two out of the four blood tests are abnormal, you are considered to have gestational diabetes.
Annabi et al. (1998) reported linkage of the GSD Ib locus to genetic markers spanning a 3-cM region on 11q23. The region is located between D11S939 centromerically and D11S4129 telomerically and includes the IL10R (146933), ATP1G1 (601814), and ALL1 (159555) genes. The authors studied 8 consanguineous families and 1 nonconsanguineous family of various ethnic origins. The assignment to chromosome 11 was confirmed by Kure et al. (1998), who showed that the translocase gene that is mutated in this disorder maps to chromosome 11 by study of somatic cell hybrids.
Liver cells express the transmembrane enzyme glucose-6-phosphatase in the endoplasmic reticulum. The catalytic site is found on the lumenal face of the membrane, and removes the phosphate group from glucose-6-phosphate produced during glycogenolysis or gluconeogenesis . Free glucose is transported out of the endoplasmic reticulum via GLUT7 and released into the bloodstream via GLUT2 for uptake by other cells. Muscle cells lack this enzyme, so myofibers use glucose-6-phosphate in their own metabolic pathways such as glycolysis. Importantly, this prevents myocytes from releasing glycogen stores they have obtained into the blood.