Absolute CD4 count: The number of ‘helper’ T-lymphocytes in a cubic millimeter of blood. The absolute CD4 count is frequently used to monitor the extent of immune suppression in persons with HIV because with HIV, this number declines as the infection progresses. Also known as T4 count.
Abstemious: Marked by restraint, especially in the consumption of food or alcohol. From the Latin prefix “abs-,” meaning “from” or “away,” and the Latin noun “temetum,” meaning “intoxicating drink.”
- Absorbed dose
Absorbed dose: In radiology, the amount of energy that is deposited in any material by ionizing radiation. The unit of absorbed dose, the rad, is a measure of energy absorbed per gram of material. An alternative unit of absorbed dose is the gray. One gray equals 100 rads.
- Abstinence, periodic
Abstinence, periodic: Also known as fertility awareness, natural family planning, and the rhythm method, this approach entails not having sexual intercourse on the days of a woman’s menstrual cycle when she could become pregnant or using a barrier method (such as a condom, the diaphragm or a cervical cap) for birth control on those days. […]
Absorption: Uptake. For example, intestinal absorption is the uptake of food (or other substances) from the digestive tract.
- Abuse, elder
Abuse, elder: The physical, sexual, or emotional abuse of an elderly person, usually one who is disabled or frail. Like child abuse, elder abuse is a crime that all health and social services professionals are mandated to report.