{"id":31875,"date":"2025-06-24T10:28:15","date_gmt":"2025-06-24T08:28:15","guid":{"rendered":"https:\/\/www.mylav.net\/?p=31875"},"modified":"2025-06-25T16:27:01","modified_gmt":"2025-06-25T14:27:01","slug":"discordances-entre-lanalyse-microscopique-du-sediment-urinaire-et-luroculture-quelles-peuvent-etre-les-causes","status":"publish","type":"post","link":"https:\/\/www.mylav.net\/fr\/microbiologie\/discordances-entre-lanalyse-microscopique-du-sediment-urinaire-et-luroculture-quelles-peuvent-etre-les-causes\/","title":{"rendered":"Discordances entre l\u2019analyse microscopique du s\u00e9diment urinaire et l\u2019uroculture : quelles peuvent \u00eatre les causes ?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Il vous est certainement d\u00e9j\u00e0 arriv\u00e9 de constater des r\u00e9sultats apparemment incoh\u00e9rents entre l\u2019examen des urines et l\u2019uroculture\u00a0: un aspect microscopique du s\u00e9diment urinaires qui ne correspond pas aux r\u00e9sultats bact\u00e9riologiques. Pourtant, ces discordances peuvent avoir plusieurs explications m\u00e9dicales et scientifiques.<\/span><\/p>\n<p><b>Une infection du tractus urinaire (ITU)<\/b><span style=\"font-weight: 400;\"> correspond \u00e0 l\u2019atteinte des m\u00e9canismes de d\u00e9fense de l\u2019h\u00f4te par une bact\u00e9rie virulente, capable d\u2019adh\u00e9rer, de se multiplier et de persister dans une portion du tractus urinaire.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Les ITU sont le plus souvent d\u2019origine bact\u00e9rienne, mais des champignons ou des virus peuvent \u00e9galement en \u00eatre responsables.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">L\u2019infection peut toucher un site unique comme le rein (py\u00e9lon\u00e9phrite), l\u2019uret\u00e8re (ur\u00e9t\u00e9rite), la vessie (cystite), l\u2019ur\u00e8tre (ur\u00e9trite), et parfois des organes g\u00e9nitaux comme la prostate (prostatite) ou le vagin (vaginite).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Elle peut \u00eatre symptomatique ou non, avec des signes cliniques qui justifient alors une investigation approfondie : pollakiurie, strangurie, h\u00e9maturie, etc. (Bartges, 2004).<\/span><\/p>\n<p><b>L\u2019analyse d\u2019urine<\/b><span style=\"font-weight: 400;\"> est un test de laboratoire courant permettant d\u2019\u00e9valuer les propri\u00e9t\u00e9s physiques, chimiques et microscopiques des urines.<\/span><\/p>\n<p><b>L\u2019uroculture<\/b><span style=\"font-weight: 400;\">\u00a0est un examen bact\u00e9riologique visant \u00e0 d\u00e9tecter les agents \u00e9tiologiques responsables d\u2019infections urinaires, les isoler, \u00e9valuer leur charge microbienne, effectuer un antibiogramme, et analyser les causes de r\u00e9cidive ou de r\u00e9sistance.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">L\u2019analyse du <\/span><b>s\u00e9diment urinaire<\/b><span style=\"font-weight: 400;\"> constitue une \u00e9tape essentielle de l\u2019examen d\u2019urine. Apr\u00e8s centrifugation, le d\u00e9p\u00f4t est observ\u00e9 au microscope pour identifier les \u00e9l\u00e9ments pathologiques \u00e9ventuels.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">En conditions physiologiques, le s\u00e9diment est pauvre, compos\u00e9 de quelques cellules de d\u00e9squamation, leucocytes ou h\u00e9maties isol\u00e9es.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">L\u2019interpr\u00e9tation de l&rsquo;uroculture doit \u00eatre confront\u00e9e aux r\u00e9sultats cytologiques du s\u00e9diment et int\u00e9gr\u00e9e dans le contexte clinique global.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">De nombreux microorganismes susceptibles de coloniser le tractus urinaire sont \u00e9galement des commensaux du tube digestif, de l\u2019appareil uro-g\u00e9nital ou de la peau.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dans ce contexte, la pr\u00e9sence, en quantit\u00e9 significative (exprim\u00e9e en UFC\/mL), d\u2019un isolat bact\u00e9rien issu d\u2019une uroculture r\u00e9alis\u00e9e sur un pr\u00e9l\u00e8vement par cystocent\u00e8se, associ\u00e9e \u00e0 une pyurie (forte concentration de neutrophiles dans le s\u00e9diment) est hautement suggestive d\u2019une infection urinaire.<\/span><\/p>\n<p><b>Peut-on obtenir un s\u00e9diment n\u00e9gatif avec une culture positive ?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Oui, et plusieurs causes peuvent l\u2019expliquer :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Charge bact\u00e9rienne trop faible pour \u00eatre visible au microscope<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Exc\u00e8s de cellules masquant la pr\u00e9sence de bact\u00e9ries<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Contaminations \u00e9ventuelles<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Limites de r\u00e9solution de l\u2019observation microscopique par rapport \u00e0 la culture, qui permet la croissance et l\u2019identification morphologique et biochimique des germes pr\u00e9sents<\/span><\/li>\n<\/ul>\n<p><b>Comment expliquer un s\u00e9diment urinaire positif alors que l\u2019examen bact\u00e9riologique est n\u00e9gatif ?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">L\u2019absence de croissance bact\u00e9rienne en culture, malgr\u00e9 une bact\u00e9riurie observ\u00e9e au microscope, peut s\u2019expliquer par plusieurs facteurs :<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Pr\u00e9sence de substances inhibitrices dans les urines<\/b><span style=\"font-weight: 400;\"> : un traitement antibiotique en cours ou la pr\u00e9sence de d\u00e9sinfectants chimiques peuvent rendre les bact\u00e9ries \u00ab non viables \u00bb. Or, seules les bact\u00e9ries vivantes et capables de se multiplier sont d\u00e9tectables en culture.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Pr\u00e9sence de pus et\/ou de cellules inflammatoires<\/b><span style=\"font-weight: 400;\"> : les enzymes lysosomiaux des neutrophiles ou la phagocytose bact\u00e9rienne peuvent inhiber la croissance des germes.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Charge bact\u00e9rienne trop faible<\/b><span style=\"font-weight: 400;\"> : en dessous du seuil de d\u00e9tection de la culture.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Mauvais ratio acide borique\/urine<\/b><span style=\"font-weight: 400;\"> : lorsqu\u2019un d\u00e9lai d\u2019analyse est in\u00e9vitable et que la r\u00e9frig\u00e9ration n\u2019est pas possible, l\u2019utilisation de tubes pr\u00e9-remplis avec un conservateur tel que l\u2019acide borique est recommand\u00e9e. Ce conservateur stabilise la concentration bact\u00e9rienne en emp\u00eachant leur prolif\u00e9ration ou leur lyse.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><b>Attention<\/b><span style=\"font-weight: 400;\"> : il est essentiel de respecter le volume d\u2019urine indiqu\u00e9 sur le r\u00e9cipient. Un rapport inad\u00e9quat (trop peu d\u2019urine par rapport \u00e0 la quantit\u00e9 de borate) peut inhiber la croissance des bact\u00e9ries en culture.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Erreurs de transport ou de conservation<\/b><span style=\"font-weight: 400;\"> : y compris des variations de temp\u00e9rature pendant l\u2019acheminement du pr\u00e9l\u00e8vement.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Bact\u00e9ries \u00e0 croissance lente ou exigeante<\/b><span style=\"font-weight: 400;\"> : comme certains ana\u00e9robies ou germes n\u00e9cessitant plus de 48 \u00e0 72 heures pour se d\u00e9velopper.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Pr\u00e9sence de bact\u00e9ries ana\u00e9robies non recherch\u00e9es<\/b><span style=\"font-weight: 400;\"> : si le pr\u00e9l\u00e8vement a \u00e9t\u00e9 expos\u00e9 \u00e0 l\u2019oxyg\u00e8ne ou si l\u2019examen n\u2019a pas sp\u00e9cifiquement inclus la recherche d\u2019ana\u00e9robies. Pour une d\u00e9tection compl\u00e8te, il est conseill\u00e9 de demander une <strong>uroculture<\/strong><\/span><b>\u00a0compl\u00e8te<\/b><span style=\"font-weight: 400;\"> (incluant bact\u00e9ries a\u00e9robies, ana\u00e9robies et levures).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Pr\u00e9l\u00e8vement inad\u00e9quat<\/b><span style=\"font-weight: 400;\"> : volume insuffisant, contamination du pr\u00e9l\u00e8vement, m\u00e9thode de recueil inappropri\u00e9e.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Artefacts microscopiques mal interpr\u00e9t\u00e9s<\/b><span style=\"font-weight: 400;\"> : certaines structures (gouttelettes lipidiques, cristaux amorphes, d\u00e9bris cellulaires, organites cytoplasmiques&#8230;) peuvent \u00eatre confondues avec des bact\u00e9ries lors de l\u2019examen microscopique du s\u00e9diment.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Dans ce cas, un examen cytologique du s\u00e9diment urinaire peut s\u2019av\u00e9rer tr\u00e8s utile. Il permet une meilleure caract\u00e9risation morphologique et peut aider \u00e0 \u00e9carter une fausse bact\u00e9riurie (Soares et al., 2024).<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">Examen cytologique du s\u00e9diment urinaire apr\u00e8s coloration : nombreux leucocytes en lyse et grande quantit\u00e9 de bact\u00e9ries basophiles.<\/span><\/i><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-31877 size-full\" src=\"https:\/\/www.mylav.net\/wp-content\/uploads\/2025\/06\/Discordances-urinoculture-docx-Documenti-Google-06-24-2025_10_23_AM.png\" alt=\"\" width=\"585\" height=\"436\" \/><\/p>\n<p><b><br \/>\nBonnes pratiques de pr\u00e9l\u00e8vement<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Un pr\u00e9l\u00e8vement adapt\u00e9 est essentiel pour \u00e9viter les r\u00e9sultats discordants.<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Privil\u00e9gier la cystocent\u00e8se<\/b><span style=\"font-weight: 400;\"> : m\u00e9thode la plus fiable pour r\u00e9duire le risque de contamination.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Quantit\u00e9 suffisante<\/b><span style=\"font-weight: 400;\"> pour permettre un d\u00e9nombrement pr\u00e9cis en UFC\/mL.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Utiliser un tube avec acide borique<\/b><span style=\"font-weight: 400;\"> pour stabiliser la charge microbienne sans r\u00e9frig\u00e9ration.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Identifier correctement le pr\u00e9l\u00e8vement<\/b><span style=\"font-weight: 400;\"> avec les donn\u00e9es du patient et le contexte clinique : d\u00e9but, dur\u00e9e, progression des sympt\u00f4mes, traitements en cours, r\u00e9sultat cytologique, etc.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">Id\u00e9alement, l\u2019uroculture doit \u00eatre r\u00e9alis\u00e9e <\/span><b>avant<\/b><span style=\"font-weight: 400;\"> la mise en place d\u2019un traitement antibiotique. Si ce n\u2019est pas possible, le test reste r\u00e9alisable mais il faudra tenir compte d\u2019une possible inhibition de croissance. En fin de traitement, il est recommand\u00e9 d\u2019attendre <\/span><b>7 \u00e0 10 jours<\/b><span style=\"font-weight: 400;\"> avant de contr\u00f4ler l\u2019uroculture.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>R\u00e9f\u00e9rences<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bartges J.W., 2004. Diagnosis of urinary tract infections. Vet Clin Small Anim 34: 923\u2013933.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Soares A.B.U. et al., 2024. Are stained and unstained methods of urine sediment from dogs in accordance with microbiological culture?, Ci\u00eancia Rural, v.54:04, e20230129.<\/span><\/li>\n<\/ul>\n<p><b>Giulia Frossini<\/b><span style=\"font-weight: 400;\">, Biotechnologiste v\u00e9t\u00e9rinaire, Service de Microbiologie MYLAV<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><b>Marta Medardo<\/b><span style=\"font-weight: 400;\">, DMV, Dipl. ECVM, Responsable du Service de Microbiologie MYLAV<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>Credit: Freepik<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Il vous est certainement d\u00e9j\u00e0 arriv\u00e9 de constater des r\u00e9sultats apparemment incoh\u00e9rents entre l\u2019examen des [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":31885,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1123,1165],"tags":[],"class_list":["post-31875","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-microbiologie","category-urine"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Discordances entre l\u2019analyse microscopique du s\u00e9diment urinaire et l\u2019uroculture : quelles peuvent \u00eatre les 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