{"id":5660,"date":"2013-10-15T11:00:14","date_gmt":"2013-10-15T09:00:14","guid":{"rendered":"https:\/\/www.imferblog.com\/?p=5660"},"modified":"2026-05-10T21:53:12","modified_gmt":"2026-05-10T19:53:12","slug":"pruebas-prenatales-primer-trimestre","status":"publish","type":"post","link":"https:\/\/www.imferblog.com\/?p=5660","title":{"rendered":"Pruebas del primer trimestre de embarazo: qu\u00e9 se hace y por qu\u00e9 | IMFER Blog"},"content":{"rendered":"<p>El primer trimestre del embarazo es un periodo clave en el seguimiento prenatal. Las pruebas realizadas entre las semanas 9 y 14 tienen como objetivo confirmar la viabilidad del embarazo, datar la gestaci\u00f3n con precisi\u00f3n y evaluar el riesgo de anomal\u00edas cromos\u00f3micas fetales. En IMFER acompa\u00f1amos a nuestras pacientes desde estas primeras semanas y explicamos con detalle qu\u00e9 se hace y por qu\u00e9.<\/p>\n<h2>La ecograf\u00eda del primer trimestre<\/h2>\n<p>La ecograf\u00eda entre las semanas 11 y 14 (denominada ecograf\u00eda de translucencia nucal o del primer trimestre) es la prueba m\u00e1s importante de este periodo. Permite:<\/p>\n<ul>\n<li>Confirmar la viabilidad del embarazo (latido card\u00edaco fetal)<\/li>\n<li>Datar la gestaci\u00f3n con m\u00e1xima precisi\u00f3n mediante la medida de la longitud craneocaudal (LCC)<\/li>\n<li>Detectar embarazos m\u00faltiples y determinar la corionicidad<\/li>\n<li>Medir la translucencia nucal: el grosor del espacio transl\u00facido en la nuca fetal, que si est\u00e1 aumentado indica mayor riesgo de trisom\u00edas<\/li>\n<li>Realizar una primera revisi\u00f3n anat\u00f3mica del feto (nariz, huesos largos, vejiga)<\/li>\n<\/ul>\n<h2>El cribado bioqu\u00edmico del primer trimestre<\/h2>\n<p>Combinado con la ecograf\u00eda, la anal\u00edtica de sangre materna en este periodo mide dos marcadores producidos por la placenta:<\/p>\n<ul>\n<li><strong>PAPP-A<\/strong> (prote\u00edna plasm\u00e1tica A asociada al embarazo): niveles bajos se asocian a mayor riesgo de trisom\u00eda 21 y otras anomal\u00edas cromos\u00f3micas, y tambi\u00e9n a complicaciones placentarias.<\/li>\n<li><strong>Beta-hCG libre<\/strong>: niveles elevados se asocian a trisom\u00eda 21; niveles bajos, a trisom\u00eda 18.<\/li>\n<\/ul>\n<h2>El cribado combinado: la prueba m\u00e1s completa<\/h2>\n<p>El cribado combinado integra la edad materna, los resultados ecogr\u00e1ficos y los marcadores bioqu\u00edmicos para calcular un riesgo individualizado de trisom\u00eda 21, 18 y 13. Su tasa de detecci\u00f3n para la trisom\u00eda 21 es del 85-95% con un 5% de falsos positivos. No es diagn\u00f3stico, sino probabil\u00edstico: indica el riesgo, no la certeza.<\/p>\n<p>Si el riesgo calculado es elevado (habitualmente por encima de 1\/250), se ofrece la confirmaci\u00f3n diagn\u00f3stica mediante t\u00e9cnica invasiva (amniocentesis o biopsia corial) o mediante el test prenatal no invasivo (NIPT), que analiza ADN fetal libre en sangre materna con una sensibilidad para trisom\u00eda 21 superior al 99%.<\/p>\n<h2>\u00bfEs obligatorio hacerse estas pruebas?<\/h2>\n<p>No. Todas estas pruebas son voluntarias. La decisi\u00f3n de realizarlas o no, y qu\u00e9 hacer con los resultados si el riesgo es elevado, corresponde exclusivamente a la mujer y a su pareja, con la informaci\u00f3n y el apoyo del equipo m\u00e9dico. En IMFER nos aseguramos de explicar con claridad el significado de cada resultado antes de cualquier decisi\u00f3n.<\/p>\n<p>Si quieres profundizar en este tema, consulta nuestra <a href=\"https:\/\/www.imferblog.com\/guia-infertilidad-pareja\/\">guia sobre reproduccion asistida<\/a>.<\/p>\n<p class=\"imfer-article-cta-inline\"><a href=\"https:\/\/www.imfer.com\" target=\"_blank\" rel=\"noopener\">Consulta con nuestros especialistas en IMFER<\/a>.<\/p>\n<p><strong>Tambi\u00e9n puede interesarte:<\/strong> <a href=\"https:\/\/www.imferblog.com\/la-consanguinidad-duplicaba-el-riesgo-de-anomalias-congenitas\/\">Consanguinidad y anomal\u00edas cong\u00e9nitas: riesgos y opciones\u2026<\/a> y <a href=\"https:\/\/www.imferblog.com\/la-consanguinidad-duplicaba-el-riesgo-de-anomalias-congenitas\/\">Consanguinidad y anomal\u00edas cong\u00e9nitas: riesgos y opciones\u2026<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El primer trimestre del embarazo es un periodo clave en el seguimiento prenatal. Las pruebas realizadas entre las semanas 9 y 14 tienen como objetivo confirmar la viabilidad del embarazo, datar la gestaci\u00f3n con precisi\u00f3n y evaluar el riesgo de anomal\u00edas cromos\u00f3micas fetales. En IMFER acompa\u00f1amos a nuestras pacientes desde &#8230;<\/p>\n","protected":false},"author":1,"featured_media":3031,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1289,24,7,1286],"class_list":["post-5660","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualidad","tag-actualidad","tag-embarazo","tag-fertilidad","tag-reproduccion-asistida","h-entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Pruebas del primer trimestre de embarazo | IMFER Blog<\/title>\n<meta name=\"description\" content=\"Pruebas del primer trimestre del embarazo: ecograf\u00eda de translucencia nucal, cribado bioqu\u00edmico y cribado combinado. Gu\u00eda de especialistas en IMFER Murcia.\" \/>\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.imferblog.com\/?p=5660\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pruebas del primer trimestre de embarazo: qu\u00e9 se hace y por qu\u00e9 | IMFER Blog\" \/>\n<meta property=\"og:description\" content=\"Pruebas del primer trimestre del embarazo: ecograf\u00eda de translucencia nucal, cribado bioqu\u00edmico y cribado combinado. Gu\u00eda de especialistas en IMFER Murcia.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.imferblog.com\/?p=5660\" \/>\n<meta property=\"og:site_name\" content=\"IMFER MURCIA\" \/>\n<meta property=\"article:published_time\" content=\"2013-10-15T09:00:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-10T19:53:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.imferblog.com\/wp-content\/uploads\/2012\/02\/pregnant-woman.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"300\" \/>\n\t<meta property=\"og:image:height\" content=\"200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"IMFER\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"IMFER\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/?p=5660#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/?p=5660\"},\"author\":{\"name\":\"IMFER\",\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/#\\\/schema\\\/person\\\/b2d0cc149f6108a37354c3c2e31393a6\"},\"headline\":\"Pruebas del primer trimestre de embarazo: qu\u00e9 se hace y por qu\u00e9 | IMFER Blog\",\"datePublished\":\"2013-10-15T09:00:14+00:00\",\"dateModified\":\"2026-05-10T19:53:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/?p=5660\"},\"wordCount\":477,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/?p=5660#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.imferblog.com\\\/wp-content\\\/uploads\\\/2012\\\/02\\\/pregnant-woman.jpg\",\"keywords\":[\"actualidad\",\"embarazo\",\"Fertilidad\",\"reproduccion asistida\"],\"articleSection\":[\"Actualidad\"],\"inLanguage\":\"es\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.imferblog.com\\\/?p=5660#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/?p=5660\",\"url\":\"https:\\\/\\\/www.imferblog.com\\\/?p=5660\",\"name\":\"Pruebas del primer trimestre de embarazo | IMFER Blog\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/?p=5660#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/?p=5660#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.imferblog.com\\\/wp-content\\\/uploads\\\/2012\\\/02\\\/pregnant-woman.jpg\",\"datePublished\":\"2013-10-15T09:00:14+00:00\",\"dateModified\":\"2026-05-10T19:53:12+00:00\",\"description\":\"Pruebas del primer trimestre del embarazo: ecograf\u00eda de translucencia nucal, cribado bioqu\u00edmico y cribado combinado. Gu\u00eda de especialistas en IMFER Murcia.\",\"inLanguage\":\"es\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.imferblog.com\\\/?p=5660\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"es\",\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/?p=5660#primaryimage\",\"url\":\"https:\\\/\\\/www.imferblog.com\\\/wp-content\\\/uploads\\\/2012\\\/02\\\/pregnant-woman.jpg\",\"contentUrl\":\"https:\\\/\\\/www.imferblog.com\\\/wp-content\\\/uploads\\\/2012\\\/02\\\/pregnant-woman.jpg\",\"width\":\"300\",\"height\":\"200\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/#website\",\"url\":\"https:\\\/\\\/www.imferblog.com\\\/\",\"name\":\"IMFER MURCIA\",\"description\":\"Blog donde encontrar\u00e1s todo lo que quieres saber de fertilidad\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.imferblog.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"es\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/#organization\",\"name\":\"IMFER\",\"url\":\"https:\\\/\\\/www.imferblog.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"es\",\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.imferblog.com\\\/wp-content\\\/uploads\\\/2014\\\/11\\\/foto-logo-imfer-generica.jpg\",\"contentUrl\":\"https:\\\/\\\/www.imferblog.com\\\/wp-content\\\/uploads\\\/2014\\\/11\\\/foto-logo-imfer-generica.jpg\",\"width\":760,\"height\":351,\"caption\":\"IMFER\"},\"image\":{\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.imferblog.com\\\/#\\\/schema\\\/person\\\/b2d0cc149f6108a37354c3c2e31393a6\",\"name\":\"IMFER\",\"sameAs\":[\"http:\\\/\\\/www.imfer.com\",\"imfer\"],\"url\":\"https:\\\/\\\/www.imferblog.com\\\/?author=1\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Pruebas del primer trimestre de embarazo | IMFER Blog","description":"Pruebas del primer trimestre del embarazo: ecograf\u00eda de translucencia nucal, cribado bioqu\u00edmico y cribado combinado. Gu\u00eda de especialistas en IMFER Murcia.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.imferblog.com\/?p=5660","og_locale":"es_ES","og_type":"article","og_title":"Pruebas del primer trimestre de embarazo: qu\u00e9 se hace y por qu\u00e9 | IMFER Blog","og_description":"Pruebas del primer trimestre del embarazo: ecograf\u00eda de translucencia nucal, cribado bioqu\u00edmico y cribado combinado. Gu\u00eda de especialistas en IMFER Murcia.","og_url":"https:\/\/www.imferblog.com\/?p=5660","og_site_name":"IMFER MURCIA","article_published_time":"2013-10-15T09:00:14+00:00","article_modified_time":"2026-05-10T19:53:12+00:00","og_image":[{"width":300,"height":200,"url":"https:\/\/www.imferblog.com\/wp-content\/uploads\/2012\/02\/pregnant-woman.jpg","type":"image\/jpeg"}],"author":"IMFER","twitter_card":"summary_large_image","twitter_misc":{"Escrito por":"IMFER","Tiempo de lectura":"2 minutos"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.imferblog.com\/?p=5660#article","isPartOf":{"@id":"https:\/\/www.imferblog.com\/?p=5660"},"author":{"name":"IMFER","@id":"https:\/\/www.imferblog.com\/#\/schema\/person\/b2d0cc149f6108a37354c3c2e31393a6"},"headline":"Pruebas del primer trimestre de embarazo: qu\u00e9 se hace y por qu\u00e9 | IMFER Blog","datePublished":"2013-10-15T09:00:14+00:00","dateModified":"2026-05-10T19:53:12+00:00","mainEntityOfPage":{"@id":"https:\/\/www.imferblog.com\/?p=5660"},"wordCount":477,"commentCount":0,"publisher":{"@id":"https:\/\/www.imferblog.com\/#organization"},"image":{"@id":"https:\/\/www.imferblog.com\/?p=5660#primaryimage"},"thumbnailUrl":"https:\/\/www.imferblog.com\/wp-content\/uploads\/2012\/02\/pregnant-woman.jpg","keywords":["actualidad","embarazo","Fertilidad","reproduccion asistida"],"articleSection":["Actualidad"],"inLanguage":"es","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.imferblog.com\/?p=5660#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.imferblog.com\/?p=5660","url":"https:\/\/www.imferblog.com\/?p=5660","name":"Pruebas del primer trimestre de embarazo | IMFER Blog","isPartOf":{"@id":"https:\/\/www.imferblog.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.imferblog.com\/?p=5660#primaryimage"},"image":{"@id":"https:\/\/www.imferblog.com\/?p=5660#primaryimage"},"thumbnailUrl":"https:\/\/www.imferblog.com\/wp-content\/uploads\/2012\/02\/pregnant-woman.jpg","datePublished":"2013-10-15T09:00:14+00:00","dateModified":"2026-05-10T19:53:12+00:00","description":"Pruebas del primer trimestre del embarazo: ecograf\u00eda de translucencia nucal, cribado bioqu\u00edmico y cribado combinado. Gu\u00eda de especialistas en IMFER Murcia.","inLanguage":"es","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.imferblog.com\/?p=5660"]}]},{"@type":"ImageObject","inLanguage":"es","@id":"https:\/\/www.imferblog.com\/?p=5660#primaryimage","url":"https:\/\/www.imferblog.com\/wp-content\/uploads\/2012\/02\/pregnant-woman.jpg","contentUrl":"https:\/\/www.imferblog.com\/wp-content\/uploads\/2012\/02\/pregnant-woman.jpg","width":"300","height":"200"},{"@type":"WebSite","@id":"https:\/\/www.imferblog.com\/#website","url":"https:\/\/www.imferblog.com\/","name":"IMFER MURCIA","description":"Blog donde encontrar\u00e1s todo lo que quieres saber de fertilidad","publisher":{"@id":"https:\/\/www.imferblog.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.imferblog.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"es"},{"@type":"Organization","@id":"https:\/\/www.imferblog.com\/#organization","name":"IMFER","url":"https:\/\/www.imferblog.com\/","logo":{"@type":"ImageObject","inLanguage":"es","@id":"https:\/\/www.imferblog.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.imferblog.com\/wp-content\/uploads\/2014\/11\/foto-logo-imfer-generica.jpg","contentUrl":"https:\/\/www.imferblog.com\/wp-content\/uploads\/2014\/11\/foto-logo-imfer-generica.jpg","width":760,"height":351,"caption":"IMFER"},"image":{"@id":"https:\/\/www.imferblog.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.imferblog.com\/#\/schema\/person\/b2d0cc149f6108a37354c3c2e31393a6","name":"IMFER","sameAs":["http:\/\/www.imfer.com","imfer"],"url":"https:\/\/www.imferblog.com\/?author=1"}]}},"views":1743,"_links":{"self":[{"href":"https:\/\/www.imferblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5660","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.imferblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.imferblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.imferblog.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.imferblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5660"}],"version-history":[{"count":0,"href":"https:\/\/www.imferblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5660\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.imferblog.com\/index.php?rest_route=\/wp\/v2\/media\/3031"}],"wp:attachment":[{"href":"https:\/\/www.imferblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.imferblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.imferblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}