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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
A doctor who treats pregnant women and delivers babies.
Ogtt
See oral glucose tolerance test.
Ophthalmologist
A medical doctor who diagnoses and treats all eye diseases and eye disorders. Opthalmologists can also prescribe glasses and contact lenses.
Optician
A health care professional who dispenses glasses and lenses. An optician also makes and fits contact lenses.
Optometrist
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 taken, 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 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.
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