{"id":44029,"date":"2023-08-10T07:30:00","date_gmt":"2023-08-10T10:30:00","guid":{"rendered":"https:\/\/med.estrategia.com\/portal\/?p=44029"},"modified":"2023-08-17T15:12:43","modified_gmt":"2023-08-17T18:12:43","slug":"resumo-de-fator-reumatoide-definicao-uso-clinico-e-mais","status":"publish","type":"post","link":"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/exames\/resumo-de-fator-reumatoide-definicao-uso-clinico-e-mais\/","title":{"rendered":"Resumo de Fator Reumatoide: defini\u00e7\u00e3o, uso cl\u00ednico e mais!"},"content":{"rendered":"<p>Ol&aacute;, meu Doutor e minha Doutora! O fator reumatoide (FR) &eacute; um autoanticorpo que foi observado inicialmente em pacientes com artrite reumatoide, justificando sua nomenclatura.<p><strong>Vem com o Estrat&eacute;gia MED<\/strong> conhecer e aprender a interpretar esse importante marcador laboratorial!<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Navegue pelo conte\u00fado<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/exames\/resumo-de-fator-reumatoide-definicao-uso-clinico-e-mais\/#O-que-e-o-Fator-Reumatoide\" >O que &eacute; o Fator Reumatoide<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/exames\/resumo-de-fator-reumatoide-definicao-uso-clinico-e-mais\/#Uso-clinico-do-Fator-Reumatoide\" >Uso cl&iacute;nico do Fator Reumatoide<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/exames\/resumo-de-fator-reumatoide-definicao-uso-clinico-e-mais\/#Metodos-de-deteccao-do-Fator-Reumatoide\" >M&eacute;todos de detec&ccedil;&atilde;o do Fator Reumatoide&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/exames\/resumo-de-fator-reumatoide-definicao-uso-clinico-e-mais\/#Limitacoes-do-Fator-Reumatoide\" >Limita&ccedil;&otilde;es do Fator Reumatoide&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/exames\/resumo-de-fator-reumatoide-definicao-uso-clinico-e-mais\/#O-papel-do-Fator-Reumatoide-no-diagnostico-da-Artrite-Reumatoide\" >O papel do Fator Reumatoide no diagn&oacute;stico da Artrite Reumatoide<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/exames\/resumo-de-fator-reumatoide-definicao-uso-clinico-e-mais\/#Veja-tambem\" >Veja tamb&eacute;m:&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/exames\/resumo-de-fator-reumatoide-definicao-uso-clinico-e-mais\/#Referencias-Bibliograficas\" >Refer&ecirc;ncias Bibliogr&aacute;ficas&nbsp;<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-o-que-e-o-fator-reumatoide\"><span class=\"ez-toc-section\" id=\"O-que-e-o-Fator-Reumatoide\"><\/span>O que &eacute; o Fator Reumatoide<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Em 1940, o noruegu&ecirc;s Erik Waaler e o americano Ralph M. Rose observaram a presen&ccedil;a de anticorpos que reagiam com a por&ccedil;&atilde;o Fc das imunoglobulinas G (IgG) em pacientes com artrite reumatoide, esses anticorpos foram posteriormente denominados <strong>fator reumatoide<\/strong>. O fator reumatoide &eacute; um <strong>autoanticorpo do tipo IgM<\/strong> que se ligam &agrave;s por&ccedil;&otilde;es Fc do IgG, formando <strong>imunocomplexos <\/strong>que se depositam em articula&ccedil;&otilde;es e em outros tecidos, levando &agrave; inflama&ccedil;&atilde;o e &agrave; les&atilde;o tecidual.&nbsp;&nbsp;<\/p><p>Os mecanismos precisos que levam &agrave; produ&ccedil;&atilde;o do fator reumatoide n&atilde;o s&atilde;o totalmente compreendidos, mas acredita-se que <strong>fatores gen&eacute;ticos<\/strong> <strong>e ambientais<\/strong> possam estar envolvidos na produ&ccedil;&atilde;o do FR. &Eacute; importante notar que o fator reumatoide tamb&eacute;m pode ser encontrado em outras doen&ccedil;as autoimunes e n&atilde;o autoimunes e em at&eacute; 4% dos indiv&iacute;duos jovens saud&aacute;veis e idosos sem qualquer patologia aparente.&nbsp;<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"404\" height=\"268\" src=\"https:\/\/med.estrategia.com\/portal\/wp-content\/uploads\/2023\/08\/pasted-image-0-5.jpg\" alt=\"\" class=\"wp-image-44031\"><figcaption class=\"wp-element-caption\">Representa&ccedil;&atilde;o esquem&aacute;tica do fator reumatoide. Estrat&eacute;gia MED<\/figcaption><\/figure><\/div><p>\n\n<div id=\"new-form\">\n\t<form id=\"forms_layout\">\n\t<input type=\"hidden\" id=\"chave_de\" name=\"chave_de\" value=\"01_EMED_LEADS_TOTAIS\" \/>\n\t\t<input type=\"hidden\" id=\"mid\" name=\"mid\" value=\"515009018\" \/>\n\t\t<input type=\"hidden\" id=\"Objetivo\" name=\"Objetivo\" value=\"Medicina\" \/>\n\t\t<input type=\"hidden\" id=\"Estado_de_Origem_do_IP\" name=\"Estado_de_Origem_do_IP\"  value=\"\" \/>\n\t\t<input type=\"hidden\" id=\"Cidade_de_Origem_do_IP\" name=\"Cidade_de_Origem_do_IP\" value=\"\" \/>\n\t\t<input type=\"hidden\" id=\"Modo_de_entrada\" name=\"Modo_de_entrada\" value=\"Portal\" \/>\n\t\t<input type=\"hidden\" id=\"Pagina_Origem\" name=\"Pagina_Origem\" value=\"\" \/>\n\n\t\t<div class=\"texto\">\n\t\t\t<h3 class=\"news\">Inscreva-se em nossa newsletter!<\/h3>\n\t\t\t<p>Receba not\u00edcias sobre resid\u00eancia m\u00e9dica, revalida\u00e7\u00e3o de diplomas e concursos m\u00e9dicos, al\u00e9m de materiais de estudo gratuitos e informa\u00e7\u00f5es relevantes do mundo da Medicina.<\/p>\n\t\t<\/div>\n\t\t<div class=\"campos\">\n\t\t\t<div class=\"first_name labels\">\n\t\t\t\t<input type=\"text\" class=\"input_labels\" id=\"first_name\" name=\"Nome_Completo\" placeholder=\"Nome\" required \/>\n\t\t\t<\/div>\n\t\t\t<div class=\"email labels\">\n\t\t\t\t<input type=\"email\" class=\"input_labels\" id=\"email\" name=\"Email\" placeholder=\"E-mail\" required \/>\n\t\t\t<\/div>\n\t\t\t<button type=\"submit\" class=\"button_layout\">\n\t\t\t\t<div id=\"lblBotao\">Inscreva-se<\/div>\n\t\t\t\t<span id=\"divSpiner\" class=\"loader\" role=\"status\" style=\"display: none;\"><\/span>\t\n\t\t\t<\/button>\n\t\t<\/div><!-- \/campos -->\n\t\t\n\t\t<label class=\"container_checkbox\">Voc\u00ea concorda com a nossa\n\t\t\t<a class=\"politics_privacy_ahref\" target=\"_blank\" href=\"https:\/\/gratis.estrategiaconcursos.com.br\/politica-de-privacidade\/\">Pol\u00edtica de Privacidade<\/a> e aceita receber informa\u00e7\u00f5es adicionais do Estrat\u00e9gia Educacional.\n\t\t\t<input id=\"checkbox_layout\" type=\"checkbox\" checked=\"checked\" required \/>\n\t\t\t<span class=\"checkbox\"><\/span>\n\t\t<\/label>\n\t\t<div id=\"msg\"><\/div>\n\t\t<div id=\"error\" class=\"error\">\n\t\t<\/div>\n\t<\/form>\n<\/div><!-- \/new-form -->\n\n\n\n<\/p><h2 class=\"wp-block-heading\" id=\"h-uso-clinico-do-fator-reumatoide\"><span class=\"ez-toc-section\" id=\"Uso-clinico-do-Fator-Reumatoide\"><\/span>Uso cl&iacute;nico do Fator Reumatoide<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Embora o fator reumatoide seja amplamente estudado em pacientes com artrite reumatoide, esse marcador pode estar aumentado em outras condi&ccedil;&otilde;es, al&eacute;m disso, nem todo paciente com artrite reumatoide ter&aacute; valores elevados do fator reumatoide. <strong>O valor de refer&ecirc;ncia &eacute; &lt; 20 UI\/ml<\/strong> e pode estar elevado nas seguintes patologias:&nbsp;<\/p><ul class=\"wp-block-list\">\n<li>Hepatite C;<\/li>\n\n\n\n<li>Tuberculose;<\/li>\n\n\n\n<li>Endocardite infecciosa subaguda;<\/li>\n\n\n\n<li>Mononucleose infecciosa;<\/li>\n\n\n\n<li>Sarcoidose;<\/li>\n\n\n\n<li>Esclerodermia;<\/li>\n\n\n\n<li>S&iacute;ndrome de Sj&ouml;gren;<\/li>\n\n\n\n<li>L&uacute;pus eritematoso sist&ecirc;mico (LES); e<\/li>\n\n\n\n<li>S&iacute;filis.<\/li>\n<\/ul><h2 class=\"wp-block-heading\" id=\"h-metodos-de-deteccao-do-fator-reumatoide\"><span class=\"ez-toc-section\" id=\"Metodos-de-deteccao-do-Fator-Reumatoide\"><\/span>M&eacute;todos de detec&ccedil;&atilde;o do Fator Reumatoide&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Existem diferentes m&eacute;todos de detec&ccedil;&atilde;o do fator reumatoide (FR) no sangue. Os mais comuns incluem:<\/p><ol class=\"wp-block-list\">\n<li><strong>Teste de Waaler-Rose<\/strong>: Embora n&atilde;o seja mais amplamente utilizado, o teste de Waaler-Rose foi um dos primeiros m&eacute;todos para detec&ccedil;&atilde;o do FR.<\/li>\n<\/ol><ol class=\"wp-block-list\" start=\"2\">\n<li><strong>Teste do L&aacute;tex<\/strong>: O teste do l&aacute;tex &eacute; um m&eacute;todo r&aacute;pido e simples para detectar o FR.<\/li>\n<\/ol><ol class=\"wp-block-list\" start=\"3\">\n<li><strong>Nefelometria<\/strong>: A nefelometria &eacute; um m&eacute;todo mais sens&iacute;vel e mais utilizado atualmente, que mede a quantidade de part&iacute;culas que dispersam a luz em um soro.<\/li>\n<\/ol><h2 class=\"wp-block-heading\" id=\"h-limitacoes-do-fator-reumatoide\"><span class=\"ez-toc-section\" id=\"Limitacoes-do-Fator-Reumatoide\"><\/span>Limita&ccedil;&otilde;es do Fator Reumatoide&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2><p>&Eacute; importante conhecer algumas limita&ccedil;&otilde;es do fator reumatoide que devem ser considerados dependendo do contexto cl&iacute;nico:&nbsp;<\/p><ol class=\"wp-block-list\">\n<li>Como j&aacute; mencionamos, <strong>o fator reumatoide n&atilde;o &eacute; espec&iacute;fico para a artrite reumatoide<\/strong> e pode estar presente em outras doen&ccedil;as autoimunes e em indiv&iacute;duos saud&aacute;veis.<\/li>\n<\/ol><ol class=\"wp-block-list\" start=\"2\">\n<li>Os pacientes idosos podem apresentar valores mais elevados.<\/li>\n<\/ol><ol class=\"wp-block-list\" start=\"3\">\n<li>A transfus&atilde;o recente de sangue, as m&uacute;ltiplas vacina&ccedil;&otilde;es ou um complemento inadequadamente ativado podem afetar os resultados.<\/li>\n<\/ol><ol class=\"wp-block-list\" start=\"4\">\n<li>O soro com crioglobulina ou n&iacute;veis elevados de lip&iacute;dios podem produzir resultados falso-&shy;positivos.<\/li>\n<\/ol><h2 class=\"wp-block-heading\" id=\"h-o-papel-do-fator-reumatoide-no-diagnostico-da-artrite-reumatoide\"><span class=\"ez-toc-section\" id=\"O-papel-do-Fator-Reumatoide-no-diagnostico-da-Artrite-Reumatoide\"><\/span>O papel do Fator Reumatoide no diagn&oacute;stico da Artrite Reumatoide<span class=\"ez-toc-section-end\"><\/span><\/h2><p>O fator reumatoide est&aacute; presente em 70% a 80% dos pacientes com artrite reumatoide, com <strong>sensibilidade de 65% a 75%<\/strong> e <strong>especificidade de 80% a 85%<\/strong>. Portanto, nem todos os pacientes com artrite reumatoide possuem FR positivo, e nem todas as pessoas com FR positivo t&ecirc;m artrite reumatoide.&nbsp;<\/p><p>Os pacientes com fator reumatoide positivo com artrite reumatoide tendem a apresentar doen&ccedil;a articular mais agressiva e manifesta&ccedil;&otilde;es extra-articulares, como n&oacute;dulos reumatoide e vasculites, do que aqueles com fator reumatoide negativo. Al&eacute;m disso, o FR &eacute; usado como um dos crit&eacute;rios classificat&oacute;rios para artrite reumatoide.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"781\" height=\"591\" src=\"https:\/\/med.estrategia.com\/portal\/wp-content\/uploads\/2023\/08\/pasted-image-0-4.jpg\" alt=\"\" class=\"wp-image-44030\" srcset=\"https:\/\/med.estrategia.com\/portal\/wp-content\/uploads\/2023\/08\/pasted-image-0-4.jpg 781w, https:\/\/med.estrategia.com\/portal\/wp-content\/uploads\/2023\/08\/pasted-image-0-4-768x581.jpg 768w\" sizes=\"(max-width: 781px) 100vw, 781px\" \/><figcaption class=\"wp-element-caption\">Fator reumatoide como crit&eacute;rio classificat&oacute;rio para Artrite Reumatoide. Estrat&eacute;gia MED<\/figcaption><\/figure><\/div><p><strong><a id=\"cta\" class=\"cta-imagem\" href=\"https:\/\/med.estrategia.com\/cursos\/extensivo-de-residncia-mdica\/\" target=\"blank\">\n                <img decoding=\"async\" width=\"100%\" src=\"https:\/\/med.estrategia.com\/portal\/wp-content\/uploads\/2025\/08\/extensivo_rm.jpg\" alt=\"Extensivo RM\" title=\"extensivo_rm\">\n        <\/a><\/strong><\/p><h2 class=\"wp-block-heading\" id=\"h-veja-tambem\"><span class=\"ez-toc-section\" id=\"Veja-tambem\"><\/span>Veja tamb&eacute;m:&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/resumed\/resumed-de-artrite-reumatoide\/\">ResuMED de artrite reumatoide: epidemiologia, manifesta&ccedil;&otilde;es, diagn&oacute;stico, tratamento e mais!<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/doencas\/resumo-de-artrite-septica-aguda-diagnostico-tratamento-e-mais\/\">Resumo de artrite s&eacute;ptica aguda: diagn&oacute;stico, tratamento e mais!<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/resumed\/resumed-de-espondiloartrites\/\">ResuMED de espondiloartrites: doen&ccedil;as, diagn&oacute;stico e mais!<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/med.estrategia.com\/portal\/conteudos-gratis\/doencas\/resumo-de-costocondrite-diagnostico-tratamento-e-mais\/\">Resumo de costocondrite: diagn&oacute;stico, tratamento e mais!<\/a><\/li>\n<\/ul><h2 class=\"wp-block-heading\" id=\"h-referencias-bibliograficas\"><span class=\"ez-toc-section\" id=\"Referencias-Bibliograficas\"><\/span>Refer&ecirc;ncias Bibliogr&aacute;ficas&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2><ol class=\"wp-block-list\">\n<li>Carl A. Burtis, David E. Bruns, Edward R. Ashwood. <strong>Interpreta&ccedil;&atilde;o de Exames Laboratoriais<\/strong>. 10. ed. Rio de Janeiro: Guanabara Koogan, 2016<\/li>\n<\/ol><ol class=\"wp-block-list\" start=\"2\">\n<li>Tiwari V, Jandu JS, Bergman MJ. <strong>Rheumatoid Factor<\/strong>. [Updated 2022 Jul 25]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: <a href=\"https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK532898\/\" target=\"_blank\" rel=\"noopener noreferrer\">https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK532898\/<\/a><\/li>\n<\/ol><ol class=\"wp-block-list\" start=\"3\">\n<li>Robert H Shmerling, MD. <strong>Rheumatoid factor: Biology and utility of measurement<\/strong>. Uptodate. 2023<\/li>\n<\/ol><\/p>\n","protected":false},"excerpt":{"rendered":"Ol&aacute;, meu Doutor e minha Doutora! O fator reumatoide (FR) &eacute; um autoanticorpo que foi observado inicialmente em&hellip;\n","protected":false},"author":46,"featured_media":44032,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"wl_entities_gutenberg":"","footnotes":""},"categories":[305],"tags":[630,85,631,47,633,632,95],"wl_entity_type":[199],"class_list":{"0":"post-44029","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-exames","8":"tag-artrite-reumatoide","9":"tag-clinica-medica","10":"tag-fator-reumatoide","11":"tag-hematologia","12":"tag-igg","13":"tag-laboratorio","14":"tag-residencia-medica","15":"wl_entity_type-article"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.6 (Yoast SEO v26.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Resumo de Fator Reumatoide: defini\u00e7\u00e3o, uso cl\u00ednico e mais!<\/title>\n<meta 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