| ACH | acetylcholine; achalasia; active chronic hepatitis; adrenocortical hormone; amyotrophic cerebellar h... |
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| AIM | Abridged Index Medicus; acute transverse myelopathy; area of interest magnification; artificial inte... |
| ALI | acute lung injury; annual limit of intake; average lobe index |
| APACHE | Acute Physiology and Chronic Health Evaluation [severity-of-illness index] |
| APTI | airway pressure time index |
| freedle index | An index of the quality of spawning gravel obtained by dividing geometric mean diameter of particle size by the sorting coefficient. (09 Oct 1997) |
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| free thyroxine index | An arbitrary value obtained by multiplying the triiodothyronine uptake by the serum thyroxine concentration; it largely corrects for variations in thyroid-bound globulin concentration by providing a clinically valid estimate of the physiologically active free thyroxine; direct assay or laboratory measurement of free serum thyroxine yields a more accurate value. (05 Mar 2000) |
| length-breadth index | The ratio of the maximal breadth to the maximal length of the head, obtained by the formula: (breadth × 100)/length. Synonym: length-breadth index. (05 Mar 2000) |
| length-height 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) |
| leukopenic index | A significant decrease in the white blood count after ingestion of food to which a patient is hypersensitive, a count made during the normal fasting state being used as the basis for evaluation of the postprandial count. (05 Mar 2000) |