[L. trias, fr. Gr. trias, stem triad-, group of three]

1. A group of three things having something in common, e.g., a syndrome.
2. A trivalent element or radical.
SEE: trivalent

adoption triad

The biological parents of a child, the adoptive parents, and the child who is adopted.

Austrian triad

SEE: Austrian triad

Beck triad

SEE: Beck triad

Bergman triad

SEE: Bergman triad

Carney triad

SEE: Carney triad

catalytic triad

The enzymatically active mechanism found in serine proteases, consisting of three amino acids SER-HIS-ASP (serine, histidine, and aspartic acid).

Charcot triad

SEE: Charcot, Jean M.

Currarino triad

SEE: Currarino triad

Dieulafoy triad

SEE: Dieulafoy, Georges

female athlete triad

A triad consisting of abnormal eating habits (eating disorders or disordered eating), amenorrhea, and osteoporosis among young female athletes. It is most common in sports in which low body weight has a beneficial effect on performance or appearance, e.g., gymnastics, running, swimming, and figure skating. Males participating in the same sports or in wrestling may also suffer the health-related effects of excessive training or abnormally restrictive eating. Disordered eating is often the first condition in the triad to appear.

Signs of the disorder include excessive training, food restriction, ritualized eating habits, and other obsessive behavior, binging and purging, fatigue, anemia, depression, and electrolyte imbalances. Fractures occur because of bone loss, which may not be reversible.

Screening female high school or younger at-risk athletes for disordered eating and menstrual irregularities is recommended as a first step in preventing development of the disorder. During physical exams required for participation in sports, athletes should be asked about food intake within the past 24 hr, perceived ideal weight, forbidden foods, and use of diet aids. Some women and coaches believe that amenorrhea is a normal consequence of athletic training rather than a sign of injury to the hypothalamic-pituitary axis. A dual-energy x-ray absorptiometry (DEXA) scan or similar study should be considered in athletes with amenorrhea lasting at least 6 months. The patient, dietitian, and primary care provider should agree on a goal weight, after considering the weight requirements for the sport.

follicular occlusion triad

A collective term for three related forms of localized skin abscess: hidradenitis suppurativa, acne conglobata, and dissecting cellulitis of the scalp.

Garland triad

SEE: Garland triad

Hutchinson triad

SEE: Hutchinson, Sir Jonathan

lethal triad

The combination of acidosis, coagulopathy, and hypothermia in a critically ill patient. It is an indication of very severe illness and has a poor prognosis.

Saint triad

SEE: Saint triad

Samter triad

SEE: Samter triad

terrible triad

1. A colloquial term for a dislocation of the elbow accompanied by fractures of the coronoid process of the ulna and of the radial head. The injury produces an unstable joint.
2. A knee injury in which a tear in the anterior cruciate ligament and in the medial collateral ligament occur at the same time as a medial meniscus tear.

Tourette syndrome triad

SEE: de la Tourette, Georges Gilles