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An isoantibody normally present in the serum of an individual that causes the agglutination of the red blood cells of another individual of the same species.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biology) an antibody that causes agglutination of red blood cells in animals of the same species from which it was derived
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌaɪ soʊ əˈglut n ɪn)

an agglutinin that can effect isoagglutination.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.isoagglutinin - an antibody produced by one individual that causes agglutination of red blood cells in other individuals of the same species
agglutinin - an antibody that causes agglutination of a specific antigen
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Carter et al., "ABO-incompatible cardiac transplantation in pediatric patients with high isohemagglutinin titers," The Journal of Heart and Lung Transplantation, vol.
It was considered to be normal for the isohemagglutinin titres to be 1/10 and the anti-hepatitis B (HB) level to be >10 mIU/ml.
The working diagnosis of CVID could not be confirmed in accordance with current diagnostic criteria (available at due to a lack of data on our patients' vaccination responses and isohemagglutinin titer levels.
Antibody titration is clinically indicated in 1) prenatal studies, 2) identifying antibody specificity, 3) separating multiple antibodies, and when 4) performing ABO isohemagglutinin titers on apheresis donor platelet units or organs that are to be transplanted across ABO blood types.
The isohemagglutinin titer is determined by the highest dilution of patient serum that still results in donor RBC agglutination.