| system theory, general |
A theory developed by Ludwig von Bertalanffy, which asserts that all living systems are open systems constantly exchanging information, matter, and energy with the environment. There are three levels of reference for syste
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| systemic l. erythematosus |
a chronic, remitting, relapsing, inflammatory, often febrile multisystemic disorder of connective tissue, acute or insidious in onset, characterized principally by involvement of the skin (cutaneous l. erythematosus), joints, kidneys, and serosal membranes. It is of unknown etiology, but it is thought to represent a failure of regulatory mechanisms of the autoimmune system, as suggested by the high level of numerous autoantibodies against nuclear and cytoplasmic cellular components. It is marked by a wide variety of abnormalities, including arthritis and arthralgias, nephritis, central nervous system manifestations, pleurisy, pericarditis, leukopenia or thrombocytopenia, hemolytic anemia, elevated erythrocyte sedimentation rate, and positive LE-cell preparations. See also drug-induced l.
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| systematic error |
The residual error after random error has been subtracted from total error. SEE: bias; proportional error .
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| systemic l. erythematosus, ANA-negative |
antiphospholipid syndrome.
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| Systematized Nomenclature of Medicine |
ABBR: SNOMED. A systematized collection of medically useful terms published by the American College of Pathologists. The words in the collection are arranged in various fields to permit coding, computerizat
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