| ANC | absolute neutrophil count; acid neutralization capacity; antigen-neutralizing capacity; Army Nurse C... |
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| APR | abdominoperineal resection; absolute proximal reabsorption; acute phase reaction or reactant; amebic... |
| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
| ARD | absolute reaction of degeneration; acute radiation disease; acute respiratory disease; adult respira... |
| ARP | absolute refractory period; American Registry of Pathologists; anticipated recovery path; apolipopro... |
| transmission threshold | <epidemiology> Occurs for a parasite when the basic reproductive rate Ro is equal to 1. Below this threshold level the disease is unable to maintain itself within the host population. Typically, for directly transmitted parasites there is a transmission threshold for the host population size. (05 Dec 1998) |
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| erythema threshold | The amount of radiation that causes redness of the skin. (09 Oct 1997) |
| fibrillation threshold | Least intensity of an electrical stimulus that will initiate fibrillation. (05 Mar 2000) |
| fusion-inferred threshold test | Employment of the phenomenon of cerebral fusion of binaural sounds to substitute for conventional masking in hearing testing. Synonym: FIT test. (05 Mar 2000) |
| light differential threshold | The smallest difference in light intensity that can be appreciated. (05 Mar 2000) |