| NI | neuraminidase inhibition; neurological improvement; neutralization index; no information; noise inde... |
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| PEI | Patient Exit Interview; phosphate excretion index; physical efficiency index; polyethyleneimine |
| PRI | Pain Rating Index; phosphate reabsorption index; phosphoribose isomerase; placental ribonuclease inh... |
| PSI | posterior sagittal index; problem solving information; prostaglandin synthetic inhibitor; psychologi... |
| RRI | recurrent respiratory infection; reflex relaxation index; relative response index |
| 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) |
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| 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) |