| RPI | regional perfusion index; relative percentage index; reticulocyte production index, ribose 5-phospha... |
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| VI | Roman numeral six; vaginal irrigation; variable interval; vastus intermedius; virgo intacta; virulen... |
| WBGT index | Wet Bulb Globe Thermometer index = 0.7tw + 0.3k{(tg-ta)oK + ta} ta; 건... |
| AEI | arbitrary evolution index; atrial emptying index |
| AHI | active hostility index; Animal Health Institute; apnea-plus-hypopnea index |
| 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) |
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| 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) |
| health status index | Set of measurements designed to detect short-term fluctuations in health of members of a population; the measurements usually include physical function, emotional well-being, activities of daily living, feelings, etc. (05 Mar 2000) |
| height-length index | The relation of the height to the length of the skull: (height × 100)/length. Synonym: height-length index, length-height index, transversovertical index. (05 Mar 2000) |
| saturation index | An indication of the relative concentration of haemoglobin in the red blood cells, calculated as: grams of haemoglobin per 100 ml (expressed as percent of normal) ÷ haematocrit value (expressed as percent of normal) = saturation index The normal index for adults and infants is 0.97 to 1.02; in primary and secondary anaemia, the index is usually considerably less than 0.97. (05 Mar 2000) |