{"id":17636,"date":"2026-07-27T23:10:15","date_gmt":"2026-07-27T23:10:15","guid":{"rendered":"https:\/\/atlasemhematologia.com.br\/blog\/?p=17636"},"modified":"2026-07-27T23:10:15","modified_gmt":"2026-07-27T23:10:15","slug":"traco-falciforme","status":"publish","type":"post","link":"https:\/\/atlasemhematologia.com.br\/blog\/traco-falciforme\/","title":{"rendered":"Tra\u00e7o falciforme"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">O tra\u00e7o falciforme \u00e9 a condi\u00e7\u00e3o hematol\u00f3gica heredit\u00e1ria mais prevalente no Brasil, estimando-se que aproximadamente 4% da popula\u00e7\u00e3o seja portadora. Caracteriza-se pela heran\u00e7a heterozig\u00f3tica da hemoglobina S, resultando no gen\u00f3tipo HbAS. Na grande maioria dos portadores, o quadro cl\u00ednico \u00e9 assintom\u00e1tico e o hemograma apresenta-se dentro dos limites de normalidade. Essa caracter\u00edstica, que aparentemente tranquiliza, \u00e9 ao mesmo tempo a principal armadilha diagn\u00f3stica: o hemograma isolado n\u00e3o identifica o tra\u00e7o falciforme. Compreender o que esse exame pode e n\u00e3o pode revelar nesse contexto \u00e9 fundamental para evitar subdiagn\u00f3stico e orientar adequadamente o racioc\u00ednio cl\u00ednico-laboratorial.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1030\" height=\"775\" src=\"https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/07\/image-1030x775.jpeg\" alt=\"\" class=\"wp-image-17637\" srcset=\"https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/07\/image-1030x775.jpeg 1030w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/07\/image-300x226.jpeg 300w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/07\/image-768x578.jpeg 768w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/07\/image.jpeg 1380w\" sizes=\"(max-width: 1030px) 100vw, 1030px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Fisiopatologia simplificada da hemoglobina S e do tra\u00e7o falciforme<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">A hemoglobina S resulta de uma muta\u00e7\u00e3o pontual no gene da cadeia beta da globina, com substitui\u00e7\u00e3o do \u00e1cido glut\u00e2mico pela valina na posi\u00e7\u00e3o 6. Quando desoxigenada, a hemoglobina S polimeriza e deforma as hem\u00e1cias, conferindo-lhes o formato de foice. No portador do tra\u00e7o falciforme, entretanto, a presen\u00e7a de pelo menos 60% de hemoglobina A normal confere prote\u00e7\u00e3o suficiente para que a polimeriza\u00e7\u00e3o n\u00e3o ocorra em condi\u00e7\u00f5es fisiol\u00f3gicas normais. Por isso, as hem\u00e1cias do portador t\u00eam morfologia preservada e sobrevida eritrocit\u00e1ria normal na circula\u00e7\u00e3o perif\u00e9rica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Em condi\u00e7\u00f5es extremas, como hip\u00f3xia grave, desidrata\u00e7\u00e3o intensa ou esfor\u00e7o f\u00edsico extenuante em altitude elevada, pode ocorrer algum grau de falciza\u00e7\u00e3o mesmo no portador do tra\u00e7o. Entretanto, essas situa\u00e7\u00f5es s\u00e3o exce\u00e7\u00f5es e n\u00e3o se refletem nos par\u00e2metros do hemograma de rotina. Portanto, a fisiopatologia do tra\u00e7o falciforme explica diretamente por que o hemograma convencional n\u00e3o \u00e9 suficiente para seu diagn\u00f3stico.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Limita\u00e7\u00f5es do hemograma no rastreio: quando solicitar eletroforese de hemoglobina<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">No portador do tra\u00e7o falciforme, o hemograma completo tipicamente apresenta hemoglobina, hemat\u00f3crito, VCM, HCM, CHCM e RDW dentro dos intervalos de refer\u00eancia. O esfrega\u00e7o de sangue perif\u00e9rico pode mostrar, ocasionalmente, algumas hem\u00e1cias em alvo, mas esse achado n\u00e3o \u00e9 espec\u00edfico e n\u00e3o confirma o diagn\u00f3stico. Portanto, o hemograma n\u00e3o rastreia o tra\u00e7o falciforme.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O exame de refer\u00eancia para o diagn\u00f3stico \u00e9 a eletroforese de hemoglobina, preferencialmente por cromatografia l\u00edquida de alta efici\u00eancia (HPLC), que quantifica as fra\u00e7\u00f5es de hemoglobina presentes na amostra. No tra\u00e7o falciforme, o resultado t\u00edpico mostra aproximadamente 60% ou mais de HbA e 40% ou menos de HbS, com HbA2 normal ou discretamente elevada e HbF dentro do intervalo de refer\u00eancia. Vale ressaltar que a presen\u00e7a concomitante de alfa-talassemia pode reduzir a propor\u00e7\u00e3o de HbS para valores abaixo de 40%, exigindo correla\u00e7\u00e3o cuidadosa com os dados cl\u00ednicos e familiares.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/eventos.atlasemhematologia.com.br\/listadeesperatimeblogatlas\"><img decoding=\"async\" width=\"1030\" height=\"276\" src=\"https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-1030x276.png\" alt=\"\" class=\"wp-image-17314\" srcset=\"https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-1030x276.png 1030w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-300x80.png 300w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-768x206.png 768w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-1536x411.png 1536w, https:\/\/atlasemhematologia.com.br\/blog\/wp-content\/uploads\/2026\/03\/BANNER-BLOG-ATLAS-2048x549.png 2048w\" sizes=\"(max-width: 1030px) 100vw, 1030px\" \/><\/a><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Import\u00e2ncia do diagn\u00f3stico correto para aconselhamento gen\u00e9tico e sa\u00fade p\u00fablica<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">O diagn\u00f3stico correto do tra\u00e7o falciforme tem implica\u00e7\u00f5es que v\u00e3o al\u00e9m do indiv\u00edduo. Quando ambos os genitores s\u00e3o portadores do tra\u00e7o HbAS, cada gesta\u00e7\u00e3o apresenta 25% de probabilidade de resultar em uma crian\u00e7a com doen\u00e7a falciforme HbSS, condi\u00e7\u00e3o de maior gravidade cl\u00ednica. Nesse contexto, o aconselhamento gen\u00e9tico \u00e9 fundamental e depende diretamente da identifica\u00e7\u00e3o laboratorial precisa da condi\u00e7\u00e3o de portador.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No Brasil, o Programa Nacional de Triagem Neonatal realiza a pesquisa de hemoglobinopatias por HPLC em papel de filtro de todos os rec\u00e9m-nascidos, permitindo o diagn\u00f3stico precoce tanto da doen\u00e7a falciforme quanto do tra\u00e7o. Entretanto, em adultos e adolescentes que n\u00e3o passaram pela triagem neonatal, o diagn\u00f3stico muitas vezes depende da solicita\u00e7\u00e3o ativa da eletroforese de hemoglobina. Reconhecer que o hemograma normal n\u00e3o exclui o tra\u00e7o falciforme \u00e9 o primeiro passo para garantir que esse diagn\u00f3stico n\u00e3o seja perdido.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Refer\u00eancias<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">OLIVEIRA, Larissa Santana; ALCANTARA, Thiago Ruan de Lima. <em>Atlas em hematologia: um guia visual para a identifica\u00e7\u00e3o de c\u00e9lulas sangu\u00edneas<\/em>. 1. ed. Salvador: Oxente, 2025.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PECKER, Lydia H.; NAIK, Rakhi P. The current state of sickle cell trait: implications for reproductive and genetic counseling. <strong>Hematology 2014, the American Society of Hematology Education Program Book<\/strong>, v. 2018, n. 1, p. 474-481, 2018.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SRIDHAR, A.; IDOWU, M. Hemoglobin electrophoresis in sickle cell disease: A primer for the clinician. <strong>Lab. Med<\/strong>, v. 52, p. 321-326, 2021.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O tra\u00e7o falciforme \u00e9 a condi\u00e7\u00e3o hematol\u00f3gica heredit\u00e1ria mais prevalente no Brasil, estimando-se que aproximadamente 4% da popula\u00e7\u00e3o seja portadora. Caracteriza-se pela heran\u00e7a heterozig\u00f3tica da hemoglobina S, resultando no gen\u00f3tipo HbAS. Na grande maioria dos portadores, o quadro cl\u00ednico \u00e9 assintom\u00e1tico e o hemograma apresenta-se dentro dos limites de normalidade. Essa caracter\u00edstica, que aparentemente tranquiliza, [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":17638,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pagelayer_contact_templates":[],"_pagelayer_content":"","footnotes":""},"categories":[13,18],"tags":[],"class_list":["post-17636","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-celulas","category-doencas-hematologicas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tra\u00e7o falciforme - Blog - Atlas em Hematologia<\/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:\/\/atlasemhematologia.com.br\/blog\/traco-falciforme\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tra\u00e7o falciforme - Blog - Atlas em Hematologia\" \/>\n<meta property=\"og:description\" content=\"O tra\u00e7o falciforme \u00e9 a condi\u00e7\u00e3o hematol\u00f3gica heredit\u00e1ria mais prevalente no Brasil, estimando-se que aproximadamente 4% da popula\u00e7\u00e3o seja portadora. Caracteriza-se pela heran\u00e7a heterozig\u00f3tica da hemoglobina S, resultando no gen\u00f3tipo HbAS. Na grande maioria dos portadores, o quadro cl\u00ednico \u00e9 assintom\u00e1tico e o hemograma apresenta-se dentro dos limites de normalidade. 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