{"id":203,"date":"2026-07-04T13:48:37","date_gmt":"2026-07-04T13:48:37","guid":{"rendered":"https:\/\/pediatrix.fr\/?page_id=203"},"modified":"2026-07-04T13:57:30","modified_gmt":"2026-07-04T13:57:30","slug":"calcul-de-lage-corrige-dun-premature","status":"publish","type":"page","link":"https:\/\/pediatrix.fr\/index.php\/calcul-de-lage-corrige-dun-premature\/","title":{"rendered":"Calcul de l’\u00e2ge corrig\u00e9 d’un pr\u00e9matur\u00e9"},"content":{"rendered":"\n\n\n\u00c2ge corrig\u00e9 du pr\u00e9matur\u00e9 : d\u00e9finition, calcul et calculateur<\/title>\n<style>\n :root{\n --blue-dark:#0b3d63;\n --blue:#1c6fa8;\n --blue-light:#e8f2fa;\n --accent:#2e9e8f;\n --text:#20303d;\n --muted:#5a6b78;\n --border:#d7e4ee;\n --white:#ffffff;\n --warn-bg:#fff4e5;\n --warn-border:#f0c27b;\n --ok-bg:#e9f7f0;\n --ok-border:#8fd6b4;\n }\n *{box-sizing:border-box;}\n body{\n margin:0;\n font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif;\n 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width:0%;\n transition:width .3s;\n }\n .progress-text{font-size:.78rem;color:var(--muted);margin-top:4px;}\n .error-msg{color:#b13a3a;font-size:.88rem;margin-top:6px;}\n footer.disclaimer{\n margin-top:48px;\n padding-top:20px;\n border-top:1px solid var(--border);\n font-size:.82rem;\n color:var(--muted);\n }\n .sources{font-size:.84rem;color:var(--muted);}\n .sources li{margin-bottom:4px;}\n<\/style>\n\n\n\n<header class=\"page-head\">\n <h1>\u00c2ge r\u00e9el et \u00e2ge corrig\u00e9 : comprendre et calculer<\/h1>\n <p>Rep\u00e8re pour le suivi de l’enfant n\u00e9 pr\u00e9matur\u00e9ment, de la naissance \u00e0 2 ans.<\/p>\n<\/header>\n\n<div class=\"wrap\">\n\n <p class=\"lead\">\n Chez l’enfant n\u00e9 avant terme, deux notions d’\u00e2ge coexistent et ne se confondent pas : l’<strong>\u00e2ge r\u00e9el<\/strong>\n (ou \u00e2ge chronologique) et l’<strong>\u00e2ge corrig\u00e9<\/strong> (ou \u00e2ge ajust\u00e9). Cette page explique la diff\u00e9rence\n et propose un outil pour calculer l’\u00e2ge corrig\u00e9 d’un enfant.\n <\/p>\n\n <h2>D\u00e9finitions<\/h2>\n <div class=\"definition-grid\">\n <div class=\"def-card\">\n <h4>\u00c2ge r\u00e9el (chronologique)<\/h4>\n <p>Temps \u00e9coul\u00e9 depuis la date de naissance effective de l’enfant, quel que soit son terme de naissance.\n C’est l’\u00e2ge de l’\u00e9tat civil.<\/p>\n <\/div>\n <div class=\"def-card\">\n <h4>\u00c2ge corrig\u00e9 (ajust\u00e9)<\/h4>\n <p>\u00c2ge que l’enfant aurait s’il \u00e9tait n\u00e9 \u00e0 terme (40 semaines d’am\u00e9norrh\u00e9e). Il tient compte du nombre\n de semaines de pr\u00e9maturit\u00e9 et rapproche l’\u00e9valuation de l’enfant de son niveau de maturit\u00e9 r\u00e9el.<\/p>\n <\/div>\n <\/div>\n\n <h2>Formule de calcul<\/h2>\n <div class=\"formula-box\">\n \u00c2ge corrig\u00e9 = \u00c2ge r\u00e9el \u2212 (40 SA \u2212 Terme de naissance en SA)\n <\/div>\n <p>\n Concr\u00e8tement : on calcule d’abord le nombre de semaines de pr\u00e9maturit\u00e9 (40 SA moins le terme de naissance),\n puis on retranche ce nombre de semaines \u00e0 l’\u00e2ge r\u00e9el de l’enfant.\n <\/p>\n <p><em>Exemple :<\/em> un enfant n\u00e9 \u00e0 30 SA, \u00e2g\u00e9 aujourd’hui de 6 mois (\u00e2ge r\u00e9el), a un d\u00e9ficit de terme de\n 10 SA (\u2248 2,3 mois). Son \u00e2ge corrig\u00e9 est donc d’environ 3,7 mois.<\/p>\n\n <h2>Quand utiliser quel \u00e2ge ?<\/h2>\n <table>\n <tbody><tr><th>Domaine<\/th><th>\u00c2ge \u00e0 utiliser<\/th><\/tr>\n <tr><td>Courbes de croissance (poids, taille, p\u00e9rim\u00e8tre cr\u00e2nien)<\/td><td>\u00c2ge corrig\u00e9, jusqu’\u00e0 2 ans<\/td><\/tr>\n <tr><td>D\u00e9veloppement psychomoteur (motricit\u00e9, langage)<\/td><td>\u00c2ge corrig\u00e9, jusqu’\u00e0 2 ans (parfois au-del\u00e0 pour les grands pr\u00e9matur\u00e9s)<\/td><\/tr>\n <tr><td>Calendrier vaccinal<\/td><td><strong>\u00c2ge r\u00e9el<\/strong> (chronologique) \u2014 pas de correction<\/td><\/tr>\n <tr><td>Diversification alimentaire<\/td><td>G\u00e9n\u00e9ralement \u00e2ge corrig\u00e9 la premi\u00e8re ann\u00e9e<\/td><\/tr>\n <\/tbody><\/table>\n\n <div class=\"note\">\n <strong>Point de vigilance vaccination :<\/strong> contrairement \u00e0 la croissance et au d\u00e9veloppement, la\n vaccination des pr\u00e9matur\u00e9s suit l’<strong>\u00e2ge r\u00e9el<\/strong>, avec des sch\u00e9mas parfois adapt\u00e9s (ex. primo-vaccination\n d\u00e8s 8 semaines d’\u00e2ge r\u00e9el, sch\u00e9ma 3+1 pour le pneumocoque avant 37 SA). Ne pas d\u00e9caler le calendrier vaccinal\n sur la base de l’\u00e2ge corrig\u00e9.\n <\/div>\n\n <h3>Fen\u00eatre d’utilisation<\/h3>\n <p>\n La correction de l’\u00e2ge est habituellement appliqu\u00e9e jusqu’\u00e0 l’\u00e2ge r\u00e9el de <strong>2 ans<\/strong> pour la\n plupart des pr\u00e9matur\u00e9s (jusqu’\u00e0 2\u20133 ans pour les grands pr\u00e9matur\u00e9s n\u00e9s avant 30 SA, selon certaines \u00e9quipes).\n Au-del\u00e0, l’\u00e2ge r\u00e9el redevient la r\u00e9f\u00e9rence pour le suivi. Le calculateur ci-dessous applique cette fen\u00eatre de 2 ans.\n <\/p>\n\n <!-- CALCULATOR -->\n <section id=\"calc\">\n <h2>Calculateur d’\u00e2ge corrig\u00e9<\/h2>\n <p style=\"margin-top:-6px;color:var(--muted);font-size:.92rem;\">\n Renseignez la date de naissance de l’enfant, son terme de naissance, puis la date \u00e0 laquelle vous\n souhaitez \u00e9valuer son \u00e2ge (aujourd’hui par d\u00e9faut).\n <\/p>\n\n <div class=\"field-row\">\n <div class=\"field\">\n <label for=\"dob\">Date de naissance de l’enfant<\/label>\n <input type=\"date\" id=\"dob\">\n <\/div>\n <div class=\"field\">\n <label for=\"evalDate\">Date d’\u00e9valuation<\/label>\n <input type=\"date\" id=\"evalDate\">\n <\/div>\n <\/div>\n\n <div class=\"field-row\">\n <div class=\"field\">\n <label>Terme de naissance<\/label>\n <div class=\"terme-row\">\n <div class=\"field\">\n <input type=\"number\" id=\"termeSA\" min=\"22\" max=\"42\" placeholder=\"SA (ex. 30)\">\n <\/div>\n <div class=\"field\">\n <input type=\"number\" id=\"termeJours\" min=\"0\" max=\"6\" placeholder=\"+ jours (0-6)\">\n <\/div>\n <\/div>\n <\/div>\n <div class=\"field\">\n <label> <\/label>\n <button id=\"compute\" type=\"button\">Calculer l’\u00e2ge corrig\u00e9<\/button>\n <\/div>\n <\/div>\n\n <div class=\"error-msg\" id=\"errorMsg\"><\/div>\n\n <div id=\"result\"><\/div>\n <\/section>\n\n <h2>R\u00e9f\u00e9rences<\/h2>\n <ul class=\"sources\">\n <li>Vaccination Info Service \u2014 <a href=\"https:\/\/professionnels.vaccination-info-service.fr\/Recommandations-vaccinales-specifiques\/Personnes-exposees-a-des-risques-specifiques\/Prematures\" target=\"_blank\" rel=\"noopener\">Recommandations vaccinales chez le pr\u00e9matur\u00e9<\/a><\/li>\n <li>Infovac.fr \u2014 <a href=\"https:\/\/www.infovac.fr\/pratique-vaccinale\/vaccination-du-premature\/\" target=\"_blank\" rel=\"noopener\">Vaccination du pr\u00e9matur\u00e9<\/a><\/li>\n <li>La Revue du Praticien \u2014 <a href=\"https:\/\/www.larevuedupraticien.fr\/article\/vaccination-des-prematures-un-schema-adapte\" target=\"_blank\" rel=\"noopener\">Vaccination des pr\u00e9matur\u00e9s : un sch\u00e9ma adapt\u00e9<\/a><\/li>\n <li>CHU Sainte-Justine \u2014 <a href=\"https:\/\/www.chusj.org\/fr\/soins-services\/P\/Prematures\/Age-corrige\" target=\"_blank\" rel=\"noopener\">\u00c2ge corrig\u00e9 des pr\u00e9matur\u00e9s<\/a><\/li>\n <\/ul>\n\n <footer class=\"disclaimer\">\n Cet outil est destin\u00e9 \u00e0 l’information des professionnels et des familles. Il ne remplace pas l’avis du\n p\u00e9diatre ou du m\u00e9decin traitant, qui reste seul juge de l’interpr\u00e9tation clinique de l’\u00e2ge corrig\u00e9 pour\n un enfant donn\u00e9. Page r\u00e9alis\u00e9e \u00e0 titre p\u00e9dagogique \u2014 AFPA \/ Pediatrix.\n <\/footer>\n<\/div>\n\n<script>\n(function(){\n var dobInput = document.getElementById('dob');\n var evalInput = document.getElementById('evalDate');\n var termeSA = document.getElementById('termeSA');\n var termeJours = document.getElementById('termeJours');\n var btn = document.getElementById('compute');\n var resultDiv = document.getElementById('result');\n var errorDiv = document.getElementById('errorMsg');\n\n \/\/ default eval date = today\n var today = new Date();\n evalInput.value = today.toISOString().slice(0,10);\n\n function humanAge(totalDays){\n if (totalDays < 0) totalDays = 0;\n var years = Math.floor(totalDays \/ 365.25);\n var remAfterYears = totalDays - years*365.25;\n var months = Math.floor(remAfterYears \/ 30.4375);\n if (totalDays < 60){\n var weeks = Math.floor(totalDays\/7);\n var days = totalDays - weeks*7;\n return weeks + ' sem' + (days>0 ? ' ' + days + ' j' : '');\n }\n if (years >= 1){\n return years + ' an' + (years>1?'s':'') + (months>0 ? ' et ' + months + ' mois' : '');\n }\n return months + ' mois';\n }\n\n \/\/ \u00c2ge corrig\u00e9 exprim\u00e9 syst\u00e9matiquement en semaines et jours (pertinent sur la fen\u00eatre 0-2 ans)\n function correctedAgeWeeksDays(totalDays){\n var sign = totalDays < 0 ? '- ' : '';\n var abs = Math.abs(totalDays);\n var weeks = Math.floor(abs \/ 7);\n var days = abs - weeks * 7;\n return sign + weeks + ' sem' + (days > 0 ? ' ' + days + ' j' : '');\n }\n\n btn.addEventListener('click', function(){\n errorDiv.textContent = '';\n resultDiv.innerHTML = '';\n\n var dobVal = dobInput.value;\n var evalVal = evalInput.value;\n var sa = parseInt(termeSA.value, 10);\n var jours = parseInt(termeJours.value, 10);\n if (isNaN(jours)) jours = 0;\n\n if(!dobVal){ errorDiv.textContent = 'Veuillez indiquer la date de naissance.'; return; }\n if(!evalVal){ errorDiv.textContent = 'Veuillez indiquer la date d\\'\u00e9valuation.'; return; }\n if(isNaN(sa) || sa < 22 || sa > 42){ errorDiv.textContent = 'Veuillez indiquer un terme de naissance valide (22 \u00e0 42 SA).'; return; }\n if(jours < 0 || jours > 6){ errorDiv.textContent = 'Le compl\u00e9ment en jours doit \u00eatre compris entre 0 et 6.'; return; }\n\n var dob = new Date(dobVal + 'T00:00:00');\n var evalDate = new Date(evalVal + 'T00:00:00');\n\n if (evalDate < dob){ errorDiv.textContent = 'La date d\\'\u00e9valuation doit \u00eatre post\u00e9rieure \u00e0 la date de naissance.'; return; }\n\n var realDays = Math.round((evalDate - dob) \/ 86400000);\n var termeDays = sa*7 + jours;\n var prematurityDays = 280 - termeDays; \/\/ 40 SA = 280 jours\n if (prematurityDays < 0) prematurityDays = 0;\n\n var correctedDaysRaw = realDays - prematurityDays;\n\n var realAgeStr = humanAge(realDays);\n var correctedAgeStr = correctedAgeWeeksDays(correctedDaysRaw);\n\n var isTermBirth = termeDays >= 259; \/\/ 37 SA = 259 jours\n var withinWindow = realDays <= 730; \/\/ 2 ans\n\n var html = '';\n html += '<div class=\"results-grid\">';\n html += ' <div class=\"result-card\"><div class=\"label\">\u00c2ge r\u00e9el<\/div><div class=\"big\">' + realAgeStr + '<\/div><\/div>';\n html += ' <div class=\"result-card\"><div class=\"label\">\u00c2ge corrig\u00e9<\/div><div class=\"big\">' + (isTermBirth ? realAgeStr : correctedAgeStr) + '<\/div><\/div>';\n html += '<\/div>';\n\n var pct = Math.min(100, Math.round((realDays\/730)*100));\n html += '<div class=\"progress-outer\"><div class=\"progress-inner\" style=\"width:' + pct + '%;\"><\/div><\/div>';\n html += '<div class=\"progress-text\">' + pct + '% de la fen\u00eatre de correction (2 ans d\\'\u00e2ge r\u00e9el)<\/div>';\n\n if (isTermBirth){\n html += '<div class=\"status-box status-info\">Terme de naissance \u2265 37 SA : cet enfant n\\'est pas consid\u00e9r\u00e9 comme pr\u00e9matur\u00e9, aucune correction d\\'\u00e2ge n\\'est n\u00e9cessaire (\u00e2ge corrig\u00e9 = \u00e2ge r\u00e9el).<\/div>';\n } else if (!withinWindow){\n html += '<div class=\"status-box status-warn\"><strong>Hors fen\u00eatre de correction :<\/strong> l\\'enfant a d\u00e9pass\u00e9 l\\'\u00e2ge r\u00e9el de 2 ans. L\\'\u00e2ge corrig\u00e9 n\\'est en principe plus utilis\u00e9 au-del\u00e0 de ce seuil (\u00e2ge r\u00e9el = r\u00e9f\u00e9rence), sauf avis contraire du p\u00e9diatre pour les tr\u00e8s grands pr\u00e9matur\u00e9s.<\/div>';\n } else {\n html += '<div class=\"status-box status-ok\">Correction applicable : utiliser l\\'\u00e2ge corrig\u00e9 pour la croissance et le d\u00e9veloppement psychomoteur. Pour la vaccination, continuer \u00e0 utiliser l\\'\u00e2ge r\u00e9el.<\/div>';\n }\n\n resultDiv.innerHTML = html;\n });\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>\u00c2ge corrig\u00e9 du pr\u00e9matur\u00e9 : d\u00e9finition, calcul et calculateur \u00c2ge r\u00e9el et \u00e2ge corrig\u00e9 : comprendre et calculer Rep\u00e8re pour le suivi de l’enfant n\u00e9 pr\u00e9matur\u00e9ment, de la\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-203","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/pediatrix.fr\/index.php\/wp-json\/wp\/v2\/pages\/203","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pediatrix.fr\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pediatrix.fr\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pediatrix.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pediatrix.fr\/index.php\/wp-json\/wp\/v2\/comments?post=203"}],"version-history":[{"count":3,"href":"https:\/\/pediatrix.fr\/index.php\/wp-json\/wp\/v2\/pages\/203\/revisions"}],"predecessor-version":[{"id":207,"href":"https:\/\/pediatrix.fr\/index.php\/wp-json\/wp\/v2\/pages\/203\/revisions\/207"}],"wp:attachment":[{"href":"https:\/\/pediatrix.fr\/index.php\/wp-json\/wp\/v2\/media?parent=203"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}