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Heterophile antibodies can cause significant interference in any immunoassay. [3] The presence of a heterophile antibody is characterized by broad reactivity with antibodies of other animal species (which are often the source of the assay antibodies). Such antibodies are commonly referred to as human anti-animal antibodies (HAAA).
Heterophile also can mean that it is an antibody that reacts with antigens other than the antigen that stimulated it (an antibody that crossreacts). [ citation needed ] A 20% suspension of horse red cells is used in an isotonic 3–8% sodium citrate formulation.
Heterophile antigens are antigens of similar nature, if not identical, that are present in different tissues in different biological species, classes, or kingdoms. [1] Usually different species have different antigen sets, but the hetereophile antigen is shared by different species.
Antibody to EBNA slowly appears 2 to 4 months after the onset of symptoms and persists for the rest of a person’s life. [10] When negative, these tests are more accurate than the heterophile antibody test in ruling out infectious mononucleosis. When positive, they feature similar specificity to the heterophile antibody test.
An example of helpful cross-reactivity is in heterophile antibody tests, which detect Epstein-Barr virus using antibodies with specificity for other antigens. Cross-reactivity is also a commonly evaluated parameter for the validation of immune and protein binding based assays such as ELISA and RIA
For example, hemolysis, icterus, lipemia, or heterophile antibodies may confound results obtained by traditional methods such as ion-selective electrodes, enzymatic assays or immunoassays. Alternate methods such as blood gas analysers, point-of-care testing or mass spectrometry may help resolve the clinical question.
The Forssman antigen is a glycolipid heterophile antigen found in certain animals like dogs, horses, cats, turtles and sheep, and enteric organisms such as pneumococci.In sheep, it is found on erythrocytes but not on tissue and organs, unlike hamsters and guinea pigs whose organ cells do carry the antigen.
This method, performed first by George K. Hirst in 1942, consists of mixing virus samples with serum dilutions so that antibodies bind to the virus before RBCs are added to the mix. Consequently, those viruses bound to antibodies are unable to link RBCs, meaning that a test’s positive result due to hemagglutination has been inhibited. On the ...