| ATS | Achard-Thiers syndrome; acid test solution; alpha-D-tocopherol acid succinate; American Thoracic Soc... |
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| CTU | cardiac-thoracic unit; centigrade thermal unit; constitutive transcription unit |
| CTV | cervical and thoracic vertebrae; clinical target volume |
| DRT | dorsal root, thoracic |
| ITA | inferior temporal artery; internal thoracic artery; International Tuberculosis Association |
| root caries index | The ratio of the number of teeth with carious lesions of the root, and/or restorations of the root, to the number of teeth with exposed root surfaces. (05 Mar 2000) |
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| Russell's Periodontal Index | An index that estimates the degree of periodontal disease present in the mouth by measuring both bone loss around the teeth and gingival inflammation; used frequently in the epidemiological investigation of periodontal disease. (05 Mar 2000) |
| mitotic index | <cell biology, molecular biology> The fraction of cells in a sample that are in mitosis. It is a measure of the relative length of the mitotic phase of the cell cycle. (18 Nov 1997) |
| molar absorbancy index | Absorbance (of light) per unit path length (usually the centimeter) and per unit of concentration (moles per liter); a fundamental unit in spectrophotometry. Synonym: absorbancy index, absorptivity, molar absorbancy index, molar absorptivity, molar extinction coefficient. (05 Mar 2000) |
| Pirquet's index | An obsolete method of establishing the presence of malnutrition by dividing the weight (grams/10) by the sitting height (in cm); the cube root of the quotient if < 0.945 was considered as indicating malnutrition. (05 Mar 2000) |
| Colour Index | A publication concerned with the chemistry of dyes, with each listed dye identified by a five-digit Colour Index number, e.g., methylene blue is Colour Index 52015. (05 Mar 2000) |
| Plaque Index | An index for estimating the status of oral hygiene by measuring dental plaque which occurs in the areas adjacent to the gingival margin. (05 Mar 2000) |
| PMA index | An index which measures the presence or absence of gingival inflammation as occurring on the papillae or the marginal or attached gingivae. (05 Mar 2000) |
| cornell medical index | Self-administered health questionnaire developed to obtain details of the medical history as an adjunct to the medical interview. It consists of 195 questions divided into eighteen sections; the first twelve deal with somatic complaints and the last six with mood and feeling patterns. The index is used also as a personality inventory or in epidemiologic studies. (12 Dec 1998) |
| ponderal index | Cube root of body weight times 100 divided by height in cm. (05 Mar 2000) |
| cranial index | The ratio of the maximal breadth to the maximal length of the skull, obtained by the formula: (breadth × 100)/length. (05 Mar 2000) |
| Cumulative Index Medicus | Collection of medical literature, published annually, which began in the US Army Surgeon General's office in the last century. It has been taken over by the National Library of Medicine and has evolved into a database called MEDLINE. (05 Mar 2000) |
| pressure-volume index | Method of evaluating the cerebrospinal fluid hydrodynamics. (05 Mar 2000) |
| prevalence index | <statistics> A weighted average measure of the sum of the frequency of occurrences of all species along a single transect or as calculated for a plant community by averaging the prevalence index of all sample transects through the community. (05 Mar 1998) |
| sacral index | A ratio obtained by multiplying the greatest breadth of the sacrum by 100 and dividing by the length. (05 Mar 2000) |