Glossary of Terms & Definitions
Listed Alphabetically - "U"

Ulcer: An open lesion of the skin or a mucous membrane of the body with necrosis of the tissue.

Ulcerative colitis: An inflammatory disease of the colon of an unknown cause. Symptoms include abdominal pain and cramping, diarrhea, and rectal bleeding.

Ultrasonography: A test in which high-frequency sound waves (ultrasound) are bounced off tissues and the echoes are converted into a picture (sonogram).

UL: Tolerable upper intake level.  Set by the Food and Nutrition Board of the Institute of Medicine, the UL is the highest level of daily intake of a specific nutrient likely to pose no risk of adverse health effects in almost all individuals in the specified life stage and gender group.

Uremia: Accumulation of toxic of urea and other nitrogenous waste products in the blood, usually resulting from severs kidney malfunction.

Urinalysis: The physical, chemical, and microscopic analysis or examination of urine.