{"id":16574,"date":"2021-08-10T00:00:00","date_gmt":"2021-08-09T22:00:00","guid":{"rendered":"https:\/\/www.ecoceutics.com\/diferencies-pcr-test-antigens\/"},"modified":"2023-04-13T10:10:28","modified_gmt":"2023-04-13T08:10:28","slug":"diferencies-pcr-test-antigens","status":"publish","type":"post","link":"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/diferencies-pcr-test-antigens\/","title":{"rendered":"Difer\u00e8ncies entre PCR i test d&#8217;ant\u00edgens"},"content":{"rendered":"<p>Tots dos s\u00f3n tests que ens permeten saber si una persona s\u2019ha contagiat de covid-19. I encara que tenen coses en com\u00fa, la metodologia i la utilitat de cadascun s\u00f3n diferents. Vegem\u2026.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contenido de la p\u00e1gina<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #333333;color:#333333\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #333333;color:#333333\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/diferencies-pcr-test-antigens\/#com-funciona-exactament-la-pcr\" >Com funciona exactament la PCR?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/diferencies-pcr-test-antigens\/#com-funciona-un-test-dantigens\" >Com funciona un test d\u2019ant\u00edgens?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/diferencies-pcr-test-antigens\/#en-que-sassemblen-i-en-que-es-diferencien-totes-dues-proves\" >En qu\u00e8 s\u2019assemblen i en qu\u00e8 es diferencien totes dues proves?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/diferencies-pcr-test-antigens\/#que-haig-de-fer-una-pcr-o-un-test-dantigens\" >Qu\u00e8 haig de fer: una PCR o un test d\u2019ant\u00edgens?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"com-funciona-exactament-la-pcr\"><\/span>Com funciona exactament la PCR?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PCR s\u00f3n les sigles en angl\u00e8s de Polymerase Chain Reaction, \u00abreacci\u00f3 en cadena de la polimerasa\u00bb. Expliquem detalladament el <a href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/funcionament-pcr\/\">funcionament d&#8217;una PCR<\/a> en aquest article\u00a0per\u00f2, resumint, podem dir que la PCR cerca material gen\u00e8tic del virus, espec\u00edficament l\u2019ARN viral. La mostra m\u00e9s comuna per a la PCR \u00e9s l\u2019hisopat\u00a0nasofaringi (\u00abel bastonet pel nas\u00bb) per\u00f2 tamb\u00e9 es pot utilitzar saliva, un\u00a0hisopat\u00a0bucofaringi (\u00abel palet per la gola\u00bb) o un\u00a0hisopat\u00a0rectal. Per qu\u00e8 rectal? Perqu\u00e8 el nostre cos elimina virus pel sistema digestiu, durant m\u00e9s dies fins i tot que pel sistema respiratori.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"com-funciona-un-test-dantigens\"><\/span>Com funciona un test d\u2019ant\u00edgens?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Un test d\u2019ant\u00edgens detecta una prote\u00efna viral (usualment la prote\u00efna N). Les mostres solen ser un\u00a0hisopat\u00a0nasal (en el cas del test d\u2019autodiagn\u00f2stic el bastonet \u00abno va tant al fons\u00bb del nas com en el cas de la PCR o els tests professionals) o salivals. Els tests s\u00f3n molt semblants a una prova d\u2019embar\u00e0s, perqu\u00e8 tenen una tira de material por\u00f3s que mostrar\u00e0 una ratlleta de color o dues ratlletes, nom\u00e9s que en comptes de recollir orina s\u2019apliquen unes gotetes de l\u00edquid en un foradet de la tira.<\/p>\n<p>Les reaccions que es donen s\u00f3n els seg\u00fcents:<\/p>\n<ul>\n<li>L\u2019hisop es posa en contacte durant un temps establert pel fabricant amb un l\u00edquid adequat per a fer el test, de manera d\u2019extreure els virus que han quedat impregnats en l\u2019hisop.<\/li>\n<li>En la primera part del test hi ha un material por\u00f3s amb una \u00abzona de purificaci\u00f3\u00bb amb reactius que permeten preparar la mostra per a les reaccions que v\u00e9nen: hi ha productes que controlen el pH, detergents que eliminen productes no desitjats, etc. Cada marca utilitza una mescla diferent.<\/li>\n<li>Passant la zona de purificaci\u00f3 el material por\u00f3s cont\u00e9 anticossos\u00a0antiprote\u00efna\u00a0N marcats amb una mol\u00e8cula acolorida (l\u00e0tex, or,\u00a0etc). La mostra es mou a trav\u00e9s del material del test, permetent el contacte entre la prote\u00efna N i l\u2019antic\u00f2s\u00a0antiprote\u00efna\u00a0N.<\/li>\n<li>El moviment continu del l\u00edquid en la vareta del test arrossega els\u00a0complexos prote\u00efna\u00a0N-antic\u00f2s\u00a0antiprote\u00efna\u00a0N fins a la zona de lectura. Una part de la zona de lectura cont\u00e9 un altre tipus d\u2019anticossos\u00a0antiprote\u00efna\u00a0N fixats al material (\u00e9s a dir, no es poden moure). Aquests anticossos capten al complex format pr\u00e8viament i l\u2019immobilitzen. Aix\u00ed, les part\u00edcules de color es concentren en aquesta banda, permetent a l\u2019ull veure una ratlleta de color que interpretem com a positiu.<\/li>\n<\/ul>\n<p>\u00c9s una reacci\u00f3 complexa, per aquest motiu sigui necessari tenir la famosa \u00abratlleta de control\u00bb. Passant la zona de purificaci\u00f3, juntament amb els anticossos\u00a0antiprote\u00efna\u00a0N, es col\u00b7loca una prote\u00efna que anomenarem A (prote\u00efnes de ratol\u00ed, de cabra,\u00a0etc) marcada amb color i capa\u00e7 de moure\u2019s amb el flux de mostra de la mateixa forma que la prote\u00efna N. La zona de control consisteix en anticossos \u00abantiprote\u00efna\u00a0A\u00bb fixats al costat de la ratlleta de reacci\u00f3: quan el front amb prote\u00efna N i prote\u00efna A arriben a la zona de control la prote\u00efna A reacciona amb els seus anticossos, apareix el color concentrat i es confirma que la prova va sortir b\u00e9. Si per algun motiu la mostra no puja pel test, o \u00abalguna cosa\u00bb succeeix, la ratlleta de control no es veur\u00e0 i el test queda invalidat.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"en-que-sassemblen-i-en-que-es-diferencien-totes-dues-proves\"><\/span>En qu\u00e8 s\u2019assemblen i en qu\u00e8 es diferencien totes dues proves?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hi ha dues grans similituds:<\/p>\n<ul>\n<li>Tots dos permeten diagnosticar la covid-19 en una persona amb s\u00edmptomes o asimptom\u00e0tica (encara que amb diferent sensibilitat).<\/li>\n<li>Ambdues tenen un per\u00edode durant el qual el cos t\u00e9 el virus, per\u00f2 no \u00e9s detectable, per aquest motiu la quarantena en cas de contacte estret sigui de\u00a010\u00a0dies i no es pugui deixar de fer tot i que la PCR o un test d\u2019antigen van ser negatius. Aix\u00f2 s\u00ed, aquest per\u00edode canvia en cada cas, ja que la PCR detecta c\u00e0rregues virals menors.<\/li>\n<\/ul>\n<p>Les difer\u00e8ncies s\u00f3n v\u00e0ries:<\/p>\n<ul>\n<li>La PCR, a causa dels bons resultats que d\u00f3na (\u00e9s dif\u00edcil que hi hagi falsos positius o falsos negatius) es considera que \u00e9s la prova de refer\u00e8ncia per a diagn\u00f2stic. El test d\u2019ant\u00edgens pot fallar alguna cosa m\u00e9s, sobretot si \u00e9s d\u2019autodiagn\u00f2stic (no sempre prenem b\u00e9 la prova perqu\u00e8 \u00e9s dif\u00edcil \u00abenvair el nas\u00bb sense dolor ni mol\u00e8sties). Per aix\u00f2 a vegades s\u2019opta per confirmar el resultat d\u2019un test d\u2019autodiagn\u00f2stic amb una PCR o amb un test d\u2019antigen fet per personal qualificat (infermeria, farm\u00e0cia).<\/li>\n<li>La PCR \u00e9s \u00fatil durant m\u00e9s temps d\u2019infecci\u00f3, perqu\u00e8 pot trobar material gen\u00e8tic durant molts dies (la PCR que confirma la curaci\u00f3 es realitza 10-14 dies despr\u00e9s del diagn\u00f2stic encara que els s\u00edmptomes se\u2019n vagin abans). El test d\u2019ant\u00edgens d\u2019autodiagn\u00f2stic \u00e9s d\u2019utilitat durant els primers\u00a05\u00a0dies de s\u00edmptomes o els primers\u00a07\u00a0dies d\u2019infecci\u00f3 aproximadament.<\/li>\n<li>La PCR requereix diverses hores per a donar un resultat mentre que els tests d\u2019ant\u00edgens donen un resultat en 20 minuts. Els laboratoris privats que realitzen\u00a0PCRs\u00a0solen trigar entre 24-48 hs entre presa de mostra i lliurament de resultats.<\/li>\n<li>La PCR requereix personal qualificat; els tests d\u2019ant\u00edgens s\u00f3n prou senzills\u00a0com per\u00a0fer-se a casa seguint les instruccions del fabricant.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"que-haig-de-fer-una-pcr-o-un-test-dantigens\"><\/span>Qu\u00e8 haig de fer: una PCR o un test d\u2019ant\u00edgens?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Dep\u00e8n perqu\u00e8 ho necessitis. Per exemple, t\u2019expliquem els casos m\u00e9s freq\u00fcents que hem vist a peu de taulell:<\/p>\n<ul>\n<li>Si vols veure a una persona sensible (avis,\u00a0immunodeprimits,\u00a0etc) \u00e9s m\u00e9s adequat un test d\u2019autodiagn\u00f2stic, perqu\u00e8 \u00e9s r\u00e0pid i econ\u00f2mic, per\u00f2 cal tenir en compte:\n<ul>\n<li>Un negatiu sense s\u00edmptomes no significa que estiguis lliure de virus i que no contagi\u00efs. La visita encara ha de dur-se a terme amb mascareta, mantenint la dist\u00e0ncia de seguretat i si \u00e9s a l\u2019aire lliure, millor.<\/li>\n<li>Un positiu significa que has de contactar amb el teu centre de salut i comen\u00e7ar la quarantena.<\/li>\n<\/ul>\n<\/li>\n<li>Si tens s\u00edmptomes compatibles amb covid-19 i est\u00e0s en els primers dies d\u2019infecci\u00f3, encara que els s\u00edmptomes siguin lleus, el test d\u2019antigen \u00e9s una excel\u00b7lent opci\u00f3 per a diagnosticar el teu quadre.<\/li>\n<li>Si vols viatjar, necessites el que el pa\u00eds de dest\u00ed et demani. A vegades \u00e9s test d\u2019ant\u00edgens, a vegades \u00e9s PCR, per\u00f2 en qualsevol cas el resultat ha d\u2019estar certificat per una instituci\u00f3 habilitada per a tal fi. En aquest cas no et serveix el test d\u2019autodiagn\u00f2stic que fas a la teva casa, perqu\u00e8 no hi ha qui certifiqui el teu resultat.<\/li>\n<li>Si vols escur\u00e7ar els\u00a010\u00a0dies de quarantena, no et serveix res.\n<ul>\n<li>La PCR triga 24-48 hs, amb el que quan tinguis el resultat sabr\u00e0s que fa dos dies eres\u00a0negatiu, per\u00f2 res m\u00e9s; avui ja pots estar tenint virus en quantitats suficients per a contagiar a alg\u00fa.<\/li>\n<li>El test d\u2019ant\u00edgens \u00e9s r\u00e0pid, per\u00f2 nom\u00e9s certifica aquest moment en el temps; els pr\u00f2xims dies pot ser que s\u00ed que siguis positiu. A m\u00e9s, el test d\u2019autodiagn\u00f2stic pot donar falsos negatius pel que d\u00e8iem m\u00e9s amunt de la dificultat de la presa de mostra. Podries estar ja malalt sense s\u00edmptomes, podries contagiar i no ho sabries.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Si tens m\u00e9s dubtes pots contactar amb la teva farm\u00e0cia de confian\u00e7a, que sabr\u00e0 indicar-te si els tests que ven s\u00f3n adequats per al teu cas o si necessites acostar-te a un laboratori privat o a un centre de salut.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tots dos s\u00f3n tests que ens permeten saber si una persona s\u2019ha contagiat de covid-19. I encara que tenen coses en com\u00fa, la metodologia i la utilitat de cadascun s\u00f3n diferents. Vegem\u2026. Com funciona exactament la PCR? PCR s\u00f3n les sigles en angl\u00e8s de Polymerase Chain Reaction, \u00abreacci\u00f3 en cadena de la polimerasa\u00bb. Expliquem detalladament [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":18072,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[4,1],"tags":[],"class_list":["post-16574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-respostes-de-salut","category-salut"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Difer\u00e8ncies entre una PCR i test d&#039;ant\u00edgens | farm\u00e0cies Ecoceutics<\/title>\n<meta name=\"description\" content=\"Saps quines difer\u00e8ncies hi ha entre un test d&#039;ant\u00edgens i una prova PCR? 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