{"id":57199,"date":"2026-09-08T11:22:42","date_gmt":"2026-09-08T09:22:42","guid":{"rendered":"https:\/\/www.mylav.net\/?p=57199"},"modified":"2026-09-08T11:57:49","modified_gmt":"2026-09-08T09:57:49","slug":"immunohistochimie-et-diagnostic-histologique-guide-pratique-mylav-quand-y-recourir-quelle-valeur-ajoutee-et-comment-preparer-le-prelevement","status":"publish","type":"post","link":"https:\/\/www.mylav.net\/fr\/histologie\/immunohistochimie-et-diagnostic-histologique-guide-pratique-mylav-quand-y-recourir-quelle-valeur-ajoutee-et-comment-preparer-le-prelevement\/","title":{"rendered":"Immunohistochimie et diagnostic histologique : guide pratique MYLAV &#8211; quand y recourir, quelle valeur ajout\u00e9e et comment pr\u00e9parer le pr\u00e9l\u00e8vement"},"content":{"rendered":"<p>L&rsquo;examen histologique par coloration h\u00e9matoxyline-\u00e9osine (H&amp;E) constitue la r\u00e9f\u00e9rence pour de nombreux diagnostics. L&rsquo;immunohistochimie (IHC) est un approfondissement cibl\u00e9 : elle aide \u00e0 confirmer la nature d&rsquo;une l\u00e9sion, \u00e0 \u00e9claircir les diagnostics diff\u00e9rentiels et, dans certains cas, \u00e0 orienter le pronostic, la stadification ou le traitement.<\/p>\n<h2><strong>Qu&rsquo;est-ce que l&rsquo;immunohistochimie, en termes simples<\/strong><\/h2>\n<p>L&rsquo;IHC est une technique qui utilise des anticorps sp\u00e9cifiques pour mettre en \u00e9vidence des prot\u00e9ines ou des antig\u00e8nes directement sur la lame histologique. L&rsquo;immunohistochimie aide le pathologiste \u00e0 mieux identifier les cellules pr\u00e9sentes et leur comportement.<\/p>\n<ul>\n<li>Elle ne remplace pas l&rsquo;histologie standard : elle la compl\u00e8te lorsque la morphologie seule ne suffit pas.<\/li>\n<li>Elle r\u00e9pond \u00e0 une question pr\u00e9cise : par exemple la lign\u00e9e cellulaire d&rsquo;origine de tumeurs peu diff\u00e9renci\u00e9es, le sous-type tumoral, l&rsquo;indice de prolif\u00e9ration ou la pr\u00e9sence d&rsquo;un agent infectieux.<\/li>\n<li>Elle doit \u00eatre interpr\u00e9t\u00e9e dans le contexte clinico-pathologique : l&rsquo;anamn\u00e8se, la localisation de la l\u00e9sion, l&rsquo;aspect microscopique et la qualit\u00e9 du pr\u00e9l\u00e8vement demeurent essentiels.<\/li>\n<\/ul>\n<h2><strong>\u00a0<\/strong><strong>Quand l&rsquo;IHC peut se r\u00e9v\u00e9ler utile<\/strong><\/h2>\n<p>Le tableau ci-dessous r\u00e9sume les raisons pour lesquelles l&rsquo;IHC peut faciliter la compr\u00e9hension des observations histopathologiques de base.<\/p>\n<h2><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium_large wp-image-57248\" src=\"https:\/\/www.mylav.net\/wp-content\/uploads\/2026\/09\/08092026fra01-768x308.jpg\" alt=\"\" width=\"768\" height=\"308\" \/><\/h2>\n<h2><strong>Pourquoi le pathologiste la propose<\/strong><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium_large wp-image-57239\" src=\"https:\/\/www.mylav.net\/wp-content\/uploads\/2026\/09\/08092026fra02-1-768x104.png\" alt=\"\" width=\"768\" height=\"104\" \/><\/p>\n<h2><strong>Comment interpr\u00e9ter le r\u00e9sultat<\/strong><\/h2>\n<ul>\n<li>R\u00e9sultat positif : il indique que le marqueur a \u00e9t\u00e9 mis en \u00e9vidence dans les cellules ou \u00e0 l&rsquo;endroit attendu, selon un profil coh\u00e9rent.<\/li>\n<li>R\u00e9sultat n\u00e9gatif : il peut \u00eatre utile, mais n&rsquo;exclut pas toujours un diagnostic ; il doit \u00eatre \u00e9valu\u00e9 en tenant compte de la qualit\u00e9 du pr\u00e9l\u00e8vement et des autres observations.<\/li>\n<li>D\u00e9lais de compte rendu : l&rsquo;IHC peut n\u00e9cessiter des jours suppl\u00e9mentaires, mais l&rsquo;objectif est de fournir une information plus fiable et cliniquement utile.<\/li>\n<\/ul>\n<h2><strong>Pr\u00e9l\u00e8vement histologique et demande d&rsquo;examen : liste de v\u00e9rification pour le v\u00e9t\u00e9rinaire<\/strong><\/h2>\n<p>Voici les recommandations essentielles \u00e0 suivre pour la bonne r\u00e9alisation de l&rsquo;examen d&rsquo;IHC.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium_large wp-image-57257\" src=\"https:\/\/www.mylav.net\/wp-content\/uploads\/2026\/09\/08092026fra03-1-768x132.png\" alt=\"\" width=\"768\" height=\"132\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Luca Aresu<\/strong>, DMV, PhD, Expert MYLAV en Pathologie<\/p>\n<p><strong>Walter Bertazzolo<\/strong>, DMV, EBVS European Specialist in Veterinary Clinical Pathology (Dipl. ECVCP) ; Directeur Scientifique de MYLAV<\/p>\n<p>&nbsp;<\/p>\n<p>Picture:\u00a0<a href=\"https:\/\/www.magnific.com\/fr\" target=\"_blank\" rel=\"noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/www.magnific.com\/fr&amp;source=gmail&amp;ust=1788943501962000&amp;usg=AOvVaw2OJ6NuyJiFHfNe4ay93k3j\">https:\/\/www.magnific.<wbr \/>com\/fr<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;examen histologique par coloration h\u00e9matoxyline-\u00e9osine (H&amp;E) constitue la r\u00e9f\u00e9rence pour de nombreux diagnostics. L&rsquo;immunohistochimie (IHC) [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":57228,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1125],"tags":[],"class_list":["post-57199","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-histologie"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Immunohistochimie et diagnostic histologique : guide pratique MYLAV - quand y recourir, quelle valeur ajout\u00e9e et comment pr\u00e9parer le pr\u00e9l\u00e8vement - MyLav<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mylav.net\/fr\/histologie\/immunohistochimie-et-diagnostic-histologique-guide-pratique-mylav-quand-y-recourir-quelle-valeur-ajoutee-et-comment-preparer-le-prelevement\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Immunohistochimie et diagnostic histologique : guide pratique MYLAV - quand y recourir, quelle valeur ajout\u00e9e et comment pr\u00e9parer le pr\u00e9l\u00e8vement - MyLav\" \/>\n<meta property=\"og:description\" content=\"L&rsquo;examen histologique par coloration h\u00e9matoxyline-\u00e9osine (H&amp;E) constitue la r\u00e9f\u00e9rence pour de nombreux diagnostics. L&rsquo;immunohistochimie (IHC) [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.mylav.net\/fr\/histologie\/immunohistochimie-et-diagnostic-histologique-guide-pratique-mylav-quand-y-recourir-quelle-valeur-ajoutee-et-comment-preparer-le-prelevement\/\" \/>\n<meta property=\"og:site_name\" content=\"MyLav\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/laboratoriolavallonea\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-08T09:22:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-08T09:57:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.mylav.net\/wp-content\/uploads\/2026\/09\/Immunohistochimie-et-diagnostic-histologique.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Omar\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Omar\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.mylav.net\\\/fr\\\/histologie\\\/immunohistochimie-et-diagnostic-histologique-guide-pratique-mylav-quand-y-recourir-quelle-valeur-ajoutee-et-comment-preparer-le-prelevement\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.mylav.net\\\/fr\\\/histologie\\\/immunohistochimie-et-diagnostic-histologique-guide-pratique-mylav-quand-y-recourir-quelle-valeur-ajoutee-et-comment-preparer-le-prelevement\\\/\"},\"author\":{\"name\":\"Omar\",\"@id\":\"https:\\\/\\\/www.mylav.net\\\/fr\\\/#\\\/schema\\\/person\\\/3bcd23eb1fe4bd11ab10ce46f81f3d0d\"},\"headline\":\"Immunohistochimie et diagnostic histologique : guide pratique MYLAV &#8211; 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