![]() ![]() Nuclear medicine The length of time required for a radioisotope to decay to one-half of the original amount having the same radioactivity a radioisotope’s effective T1/2 is either the time of decay-physical T1/2-or the time to elimination from a biological system. Immunology The time an immunoglobulin stays in the circulation: 20–25 days for IgG, 6 days for IgA, 5 days for IgM, 2–8 days for IgD, 1–5 days for IgE ![]() ![]() Its main metabolite however is salicylic acid, which has a half life of from 2-6 hours. Haematology The time that cells stay in the circulation-e.g., red blood cells, 120 days, which increases after splenectomy platelets, 4–6 days eosinophils, 3–7 hours neutrophils, 7 hours 0.25 and 2-6 hours: Aspirin, acetylsalicylic acid has a half life of 0.25 hours. The amount of time required for a substance to be reduced to one-half of its previous level by degradation and/or decay (radioactive half-life), by catabolism (biological half-life), or by elimination from a system (e.g., serum half-life) The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company.
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