Clinically relevant discrepancies between different rheumatoid factor assays

Affiliations

• ¹ Amsterdam Rheumatology and Immunology Center, Reade, Amsterdam, The Netherlands.
• ² Department of Immunopathology, Sanquin Research, Amsterdam, The Netherlands.
• ³ Queen Beatrix Hospital, Winterswijk, The Netherlands.
• ⁴ Department of Immunology, Laboratory Medical Immunology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands.
• ⁵ Medical Laboratories, Department of Immunology, Reinier de Graaf Groep, Delft, The Netherlands.
• ⁶ Department of Hematology and Clinical Chemistry Laboratories, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands.
• ⁷ Amsterdam Rheumatology and Immunology Center, VU University Medical Center, Amsterdam, The Netherlands.
• ⁸ Department of Immunopathology and Blood Coagulation, Sanquin Diagnostic Services, Amsterdam, The Netherlands.
• ⁹ Amsterdam Rheumatology and Immunology Center, Academic Medical Center, Amsterdam, The Netherlands.
• ¹⁰ Department of Immunopathology, Sanquin Research and Landsteiner Laboratory, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.