Evidence that the oral glucose-tolerance test does not provide a uniform stimulus to pancreatic islets in pregnancy.
Fifty consecutive pregnant patients referred for a glucose-tolerance test were classified on the basis of increasing (n = 20) or decreasing (n = 28) hematocrit after an oral 75-g glucose load. (The hematocrit did not change in the other two patients.) Patients with increasing hematocrit, a response previously seen in patients with the dumping syndrome, showed significantly flatter increases in glucose concentrations in plasma after the load. The mean decrease in the concentration of phosphate in plasma, measured as an index of glucose uptake by cells, was significantly less (P less than 0.05) 2 h after the load in the group with flatter glucose responses, suggesting that the flat response is ascribable to poor glucose absorption rather than to an exaggerated insulin response. These results indicate that the oral glucose-tolerance test stresses the pancreatic islets differently in different pregnant subjects, owing to individual variations in the gastrointestinal handling of the glucose load. Consequently, patients may give a "normal" result who might otherwise become hyperglycemic after normal meals. We suggest that alternative screening procedures be investigated to assess pregnant patients postprandially.
de Leacy
E A
EA
Department of Pathology, Mater Misericordiae Public Hospital, South Brisbane, Queensland, Australia.
Cowley
D M
DM
D000284:Administration, Oral; D000328:Adult; D001786:Blood Glucose / Q000032:analysis; D004064:Digestive System / Q000378:metabolism; D005260:Female; D005947:Glucose / Q000008:administration & dosage*; D005951:Glucose Tolerance Test; D006400:Hematocrit; D006801:Humans; D007515:Islets of Langerhans / Q000187:drug effects* / Q000502:physiology; D010710:Phosphates / Q000097:blood; D011247:Pregnancy / Q000097:blood*; D011254:Pregnancy in Diabetics / Q000097:blood*
D001786:Blood Glucose; D010710:Phosphates; D005947:Glucose