Diabetes Glossary

Browse or search for definitions from our comprehensive list of diabetes terms.

Browse Glossary: "o"

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 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

hy-po-gly-SEE-mik

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.

    Disclaimer

    Our glossary includes and builds on the definitions found in The Diabetes Dictionary (NIH Publication No. 07-3016, October 2006) published by the National Diabetes Information Clearinghouse, which is available on their website and is not copyrighted. The Clearinghouse encourages users of this publication to duplicate and distribute as many copies as desired.

    The U.S. Government does not endorse or favor any specific commercial product or company. Trade, proprietary, or company names appearing in this document are used only because they are considered essential in the context of the information provided.

    The National Diabetes Information Clearinghouse (NDIC) is a service of the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). For more information, visit their website at www.diabetes.niddk.nih.gov.