obesity:
a condition in which a greater than normal amount of fat is in the body; more severe than overweight; having a body mass index of 30 or more.
obstetrician (ob-steh-TRIH-shun):
a doctor who treats pregnant women and delivers babies.
ophthalmologist (AHF-thal-MAH-luh-jist):
a medical doctor who diagnoses and treats all eye diseases and eye disorders. Opthalmologists can also prescribe glasses and contact lenses.
optician (ahp-TI-shun):
a health care professional who dispenses glasses and lenses. An optician also makes and fits contact lenses.
optometrist (ahp-TAH-meh-trist):
a primary eye care provider who prescribes glasses and contact lenses. Optometrists can diagnose and treat certain eye conditions and diseases.
oral glucose tolerance test (OGTT):
a test to diagnose pre-diabetes and diabetes. The oral glucose tolerance test is given by a health care professional after an overnight fast. A blood sample is take, then the patient drinks a high-glucose beverage. Blood samples are taken at intervals for 2 to 3 hours. Test results are compared with a standard and show how the body uses glucose over time.
oral hypoglycemic (hy-po-gly-SEE-mik) agents:
medicines taken by mouth by people with type 2 diabetes to keep blood glucose levels as close to normal as possible. Classes of oral hypoglycemic agents are alpha-glucosidase inhibitors, biguanides, D-phenylalanine derivatives, meglitinides, sulfonylureas, and thiazolidinediones.
Orinase:
see tolbutamide.
overweight:
an above-normal body weight; having a body mass index of 25 to 29.9.
