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Clinical significance of positive platelet immunofluorescence test in thrombocytopenia
Author(s) -
Borne A. E. G. Kr.,
Vos J. J. E.,
Lelie J.,
Bossers B.,
Dalen C. M.
Publication year - 1986
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/j.1365-2141.1986.tb02239.x
Subject(s) - platelet , medicine , immunofluorescence , immune thrombocytopenia , antibody , indirect immunofluorescence , gastroenterology , immunology
S ummary . The sensitivity and specificity of the platelet immunofluorescence test for the diagnosis of idiopathic thrombocytopenia (ITP) was studied in a series of 255 patients. Patients' platelets were tested directly. Diethyl‐ether eluates of these platelets and patients' sera were tested indirectly with normal donor platelets. When all three tests were considered, positive results were obtained for 92.0% of the ITP patients with a platelet count of < 150 × 10 9 /1 and for 98.4% of the patients with a count of < 100 × 10 9 /1. However, for many patients rather weak test results were obtained, with a score of ½‐1 in 59.8% of the patients. Most patients (94.1%) with a positive direct test had a positive indirect test on the eluate. Thus, platelet‐bound antibodies but not platelet‐bound immune complexes were present in most, if not all, patients. Positive immunofluorescence tests were obtained for many patients with a diagnosis other than ITP. This resulted in a low specificity of the test for the diagnosis of ITP, evidently because autoimmune thrombocytopenia occurred together with many other diseases and also because antibodies against platelet cryptantigens (expressed by the action of EDTA or by platelet fixation) were present in many patients.