| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
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| CPI | California Personality Inventory; Cancer Potential Index; congenital palatopharyngeal incompetence; ... |
| CRI | Cardiac Risk Index; catheter-related infection; chronic renal insufficiency; chronic respiratory ins... |
| EPI | echo planar imaging; electronic portal imaging; Emotion Profile Index; epilepsy; epinephrine; epithe... |
| GI | gastrointestinal; gelatin infusion [medium]; gingival index; globin insulin; glomerular index; gluco... |
| 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) |
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| Schilling's index | A method of counting blood in which the polymorphonuclear neutrophils are separated into four groups according to the number and arrangement of the nuclear masses in these cells. Synonym: Schilling's index. (05 Mar 2000) |
| heterozygosity index | Measure of the number of loci for which an individual is heterozygous. (18 Nov 1997) |
| pulsatility index | Calculation of Doppler measurements of systolic and diastolic velocities in the uterine, umbilical, or foetal circulations. (05 Mar 2000) |
| severity of illness index | Levels of severity of illness within a diagnostic group which are established by various measurement criteria. (12 Dec 1998) |
| shock index | The quotient of the cardiac rate divided by the systolic blood pressure; normally approximately 0.5, but in shock (e.g., rising pulse rate with falling blood pressure), the index may reach 1.0. (05 Mar 2000) |
| Simplified Oral Hygiene Index | An index that measures the current oral hygiene status based upon the amount of debris and calculus occurring on six representative tooth surfaces in the mouth; often used in field surveys of periodontal disease. (05 Mar 2000) |
| small increment sensitivity index | The sounding of a tone 20 dB above threshold, followed by a series of 200-msec tones 1 dB louder; perception of these is indicative of cochlear damage. Synonym: small increment sensitivity index test. (05 Mar 2000) |
| small increment sensitivity index test | The sounding of a tone 20 dB above threshold, followed by a series of 200-msec tones 1 dB louder; perception of these is indicative of cochlear damage. Synonym: small increment sensitivity index test. (05 Mar 2000) |
| spiro-index | Vital capacity divided by the height of the individual. (05 Mar 2000) |
| splenic index | A rough indication of the salubrity, or the reverse, in regard to malaria of a particular district, judged by the relative absence or prevalence of enlarged spleens among the population. (05 Mar 2000) |
| nasal index | Relation of the greatest width of the nasal aperture to the length of a line from the nasion to the lower border of the nasal aperture: (nasal width × 100)/nasal height. (05 Mar 2000) |
| staphylo-opsonic index | The opsonic index calculated in relation to a staphylococcal infection, with a young culture of Staphylococcus aureus or the strain of staphylococcus from the patient being used in the test. (05 Mar 2000) |
| stroke work index | A measure of the work done by the heart with each contraction, adjusted for body surface area; equal to the stroke volume of the heart multiplied by the arterial pressure and divided by body surface area; the normal stroke work index does not exceed 40 gram-meters per square meter. (05 Mar 2000) |
| suitability index curve | Graph that depicts the suitability of a physical habitat variable for a fish species or life stage, often assumed to depict the species' or life stage's relative preference for values of the variable. (09 Oct 1997) |