| 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... |
| DSSI | Duke social support index |
| WBGT index | Wet Bulb Globe Thermometer index = 0.7tw + 0.3k{(tg-ta)oK + ta} ta; 건... |
| AEI | arbitrary evolution index; atrial emptying index |
| Calculus Surface Index | An index that measures only dental calculus, used for evaluating new calculus formation within a large group of test subjects. (05 Mar 2000) |
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| cardiac index | The amount of blood ejected by the heart in a unit of time divided by the body surface area; usually expressed in liters per minute per square meter. (05 Mar 2000) |
| radial index artery | <anatomy, artery> Origin, radial; distribution, radial side of index finger. Synonym: arteria radialis indicis, arteria volaris indicis radialis, radial index artery. (05 Mar 2000) |
| palatal index | Relation of the palatomaxillary width, measured between the outer borders of the alveolar arch just above the middle of the second molar tooth, and the palatomaxillary length, measured from the alveolar point to the middle of a transverse line touching the posterior borders of the two maxillae: (palatomaxillary width × 100)/palatomaxillary length; it notes the varying forms of the dental arcade and palate. Synonym: palatal index, palatine index. (05 Mar 2000) |
| palatomaxillary index | Relation of the palatomaxillary width, measured between the outer borders of the alveolar arch just above the middle of the second molar tooth, and the palatomaxillary length, measured from the alveolar point to the middle of a transverse line touching the posterior borders of the two maxillae: (palatomaxillary width × 100)/palatomaxillary length; it notes the varying forms of the dental arcade and palate. Synonym: palatal index, palatine index. (05 Mar 2000) |
| Marginal Line Calculus Index | An index which scores supragingival calculus found in cervical areas paralleling marginal gingiva. (05 Mar 2000) |
| vertical 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) |
| Gingival Index | An index of periodontal disease based upon the severity and location of the lesion. (05 Mar 2000) |
| Gingival-Periodontal Index | An index of gingivitis, gingival irritation, and advanced periodontal disease. (05 Mar 2000) |
| maturation index | An index indicating the degree of maturation attained by the vaginal epithelium as adjudged by the cell types being exfoliated; serves as an objective means of evaluating hormonal secretion or response; represents the percentage of parabasal cells/intermediate cells/superficials, in that order; "shift to the left" indicates more immature cells on the surface (atrophy), while "shift to the right" indicates more mature epithelium. (05 Mar 2000) |
| refractive index | <microscopy> The ratio of the velocity of light in a vacuum to the velocity in some medium. Refractive index generally increases with the atomic number of the constituent atoms. (05 Aug 1998) |
| vital index | The ratio of births to deaths within a population during a given time. (05 Mar 2000) |
| Volpe-Manhold Index | An index for comparing the amount of dental calculus in individuals. (05 Mar 2000) |
| volume index | An indication of the relative size (e.g., volume) of erythrocytes, calculated as follows: haematocrit value, expressed as per cent of normal ÷ red blood cell count, expressed as per cent of normal = volume index. (05 Mar 2000) |
| centromeric index | The ratio of the length of the short arm of the chromosome to that of the total chromosome; ordinarily expressed as a percentage. (05 Mar 2000) |