{"id":31788,"date":"2025-06-05T11:15:16","date_gmt":"2025-06-05T09:15:16","guid":{"rendered":"https:\/\/www.mylav.net\/?p=31788"},"modified":"2025-06-05T11:15:16","modified_gmt":"2025-06-05T09:15:16","slug":"le-dosage-de-la-tsh-chez-le-chat","status":"publish","type":"post","link":"https:\/\/www.mylav.net\/fr\/endocrinologie\/le-dosage-de-la-tsh-chez-le-chat\/","title":{"rendered":"Le dosage de la TSH chez le chat : quand peut-elle \u00eatre utile en  pratique ?"},"content":{"rendered":"<p>Pour cet article, nous abordons une question encore peu discut\u00e9e : <strong>le r\u00f4le du dosage de la TSH (Thyroid Stimulating Hormone) chez le chat<\/strong>.<\/p>\n<p>En m\u00e9decine v\u00e9t\u00e9rinaire f\u00e9line, la TSH est rarement mesur\u00e9e. Pourquoi cette analyse est-elle si peu utilis\u00e9e ? Et dans quels cas peut-elle r\u00e9ellement apporter une valeur ajout\u00e9e au diagnostic ? Voici quelques \u00e9l\u00e9ments de r\u00e9ponse.<\/p>\n<p><strong>1- Probl\u00e8mes analytiques :<br \/>\n<\/strong>Le test utilise un kit sp\u00e9cifique con\u00e7u pour la TSH canine. Toutefois, il a \u00e9t\u00e9 d\u00e9montr\u00e9 qu\u2019il existe une r\u00e9activit\u00e9 crois\u00e9e avec la TSH f\u00e9line, ce qui permet d\u2019obtenir des r\u00e9sultats fiables \u00e9galement chez cette esp\u00e8ce.<\/p>\n<p><strong>2- Utilit\u00e9 clinique :<br \/>\n<\/strong>Un deuxi\u00e8me point concerne l\u2019int\u00e9r\u00eat clinique du dosage de la TSH chez le chat, esp\u00e8ce dans laquelle l\u2019hyperthyro\u00efdie est fr\u00e9quente, contrairement \u00e0 l\u2019hypothyro\u00efdie, qui reste tr\u00e8s rare.<br \/>\nHistoriquement, le dosage de la TSH est consid\u00e9r\u00e9e comme un param\u00e8tre hormonal essentiel pour diagnostiquer l\u2019hypothyro\u00efdie chez l\u2019humain et chez le chien (chez qui la TSH est g\u00e9n\u00e9ralement \u00e9lev\u00e9e dans ce contexte).<\/p>\n<p><strong>3- Utilisation dans le diagnostic de l\u2019hyperthyro\u00efdie f\u00e9line :<br \/>\n<\/strong>Une \u00e9tude men\u00e9e par Peterson et collaborateurs en 2015, publi\u00e9e dans le <em>Journal of Veterinary Internal Medicine<\/em>, a montr\u00e9 que le dosage de la TSH \u00e0 l\u2019aide d\u2019un kit canin pouvait s\u2019av\u00e9rer utile dans le diagnostic de l\u2019hyperthyro\u00efdie f\u00e9line, notamment dans les cas douteux.<br \/>\nCette \u00e9tude a d\u00e9montr\u00e9 que, chez 98 % des chats hyperthyro\u00efdiens, la concentration s\u00e9rique de TSH \u00e9tait en dessous du seuil de quantification, c\u2019est-\u00e0-dire \u00e0 un niveau non d\u00e9tectable en laboratoire, inf\u00e9rieur \u00e0 0,03 ng\/mL.<br \/>\nAinsi, puisque la majorit\u00e9 des chats hyperthyro\u00efdiens ont une TSH non mesurable, la pr\u00e9sence d\u2019une TSH d\u00e9tectable (m\u00eame faible) tend \u00e0 exclure l\u2019hyperthyro\u00efdie.<br \/>\nCe test s\u2019est donc r\u00e9v\u00e9l\u00e9 tr\u00e8s sensible pour le diagnostic d\u2019hyperthyro\u00efdie avec un seuil &lt; 0,03 ng\/mL.<br \/>\nCependant, il pr\u00e9sente une faible sp\u00e9cificit\u00e9, car les chats atteints d\u2019un syndrome euthyro\u00efdien malade (euthyroid sick syndrome) peuvent \u00e9galement pr\u00e9senter un TSH indosable, tout en ayant des taux de T4 totale normaux ou faibles.<br \/>\nSur la base de cette \u00e9tude, la combinaison des valeurs de tT4, fT4 et TSH permet d\u2019am\u00e9liorer la fiabilit\u00e9 du diagnostic d\u2019hyperthyro\u00efdie f\u00e9line.<\/p>\n<p><strong>4- Utilisation dans le diagnostic de l\u2019hypothyro\u00efdie f\u00e9line :<br \/>\n<\/strong>Dans les rares cas d\u2019hypothyro\u00efdie f\u00e9line, le dosage de la TSH est indispensable, comme c\u2019est le cas chez le chien.<br \/>\nLe profil hormonal typique est constitu\u00e9 d\u2019une baisse des concentrations de tT4\/fT4, associ\u00e9e \u00e0 une \u00e9l\u00e9vation du TSH.<\/p>\n<p><strong>En r\u00e9sum\u00e9<\/strong><\/p>\n<p>Le TSH n\u2019est pas un test de routine en m\u00e9decine f\u00e9line, mais peut \u00eatre <strong>tr\u00e8s utile dans deux situations sp\u00e9cifiques<\/strong> :<\/p>\n<ul>\n<li><strong>Affiner le diagnostic d\u2019hyperthyro\u00efdie<\/strong>, notamment dans les cas limites ou douteux.<\/li>\n<li><strong>Confirmer une hypothyro\u00efdie<\/strong> (rare mais possible), en compl\u00e9ment des dosages de T4.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Pour aller plus loin, nous mettons \u00e0 disposition sur demande les publications de r\u00e9f\u00e9rence utilis\u00e9es dans cet article.<\/p>\n<p><strong>Federico Fracassi,<\/strong> DMV, PhD; Sp\u00e9cialiste Europ\u00e9enne EBVS en M\u00e9decine Interne V\u00e9t\u00e9rinaire (Dipl. ECVIM); Experte MYLAV en M\u00e9decine Interne<\/p>\n<p><strong>\u00a0Walter Bertazzolo, <\/strong>DMV, Sp\u00e9cialiste Europ\u00e9en EBVS en Pathologie Clinique V\u00e9t\u00e9rinaire (Dipl. ECVCP); Directeur Scientifique de MYLAV<\/p>\n<p><a href=\"chrome-extension:\/\/efaidnbmnnnibpcajpcglclefindmkaj\/https:\/www.mylavblog.net\/attachments\/article\/Peterson-diagnostic-testing-for-feline-thyroid-disease-hypothyroidism.pdf\">Peterson-diagnostic-testing-for-feline-thyroid-disease-hypothyroidism.pdf<\/a><\/p>\n<p><a href=\"chrome-extension:\/\/efaidnbmnnnibpcajpcglclefindmkaj\/https:\/www.mylavblog.net\/attachments\/article\/Peterson_et_al-2015-Journal_of_Veterinary_Internal_Medicine.pdf\">Peterson_et_al-2015-Journal_of_Veterinary_Internal_Medicine.pdf<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Picture:\u00a0<a href=\"https:\/\/fr.freepik.com\/\" target=\"_blank\" rel=\"noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/fr.freepik.com\/&amp;source=gmail&amp;ust=1749193672046000&amp;usg=AOvVaw2BL4aIf4YRHalnZ7wZwQkP\">https:\/\/fr.freepik.<wbr \/>com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour cet article, nous abordons une question encore peu discut\u00e9e : le r\u00f4le du dosage [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":31789,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1122],"tags":[],"class_list":["post-31788","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-endocrinologie"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le dosage de la TSH chez le chat : quand peut-elle \u00eatre utile en pratique ? 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