{"id":2664,"date":"2024-08-30T15:29:14","date_gmt":"2024-08-30T06:29:14","guid":{"rendered":"https:\/\/www.hiro-clinic.or.jp\/nippt\/%e5%a6%8a%e5%a8%a0%e9%80%b1%e6%95%b0%e3%81%ae%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/"},"modified":"2024-10-07T18:13:23","modified_gmt":"2024-10-07T09:13:23","slug":"%e5%a6%8a%e5%a8%a0%e9%80%b1%e6%95%b0%e3%81%ae%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.hiro-clinic.or.jp\/nippt\/%e5%a6%8a%e5%a8%a0%e9%80%b1%e6%95%b0%e3%81%ae%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/?lang=en","title":{"rendered":"How to calculate the number of weeks of pregnancy"},"content":{"rendered":"\n<p>The calculation of the number of weeks of pregnancy is based on the <strong>start of the last menstrual period<\/strong>. The following steps explain this in more detail.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Check the start date of the last menstrual period<\/strong>: this is the starting date for the number of weeks of pregnancy.<\/li>\n\n\n\n<li><strong>Calculation of<\/strong> expected delivery <strong>date<\/strong>: The expected delivery date is 280 days (40 weeks) after the start of the last menstrual period. This is considered the standard gestational period.<\/li>\n\n\n\n<li><strong>Calculate the current number of weeks of pregnancy<\/strong>: the <strong>difference between today&#8217;s date and the start of the last menstrual period<\/strong> is converted into weeks.<\/li>\n\n\n\n<li><strong>Ultrasound correction<\/strong>: an ultrasound scan in early pregnancy may correct the number of weeks of gestation based on actual fetal growth. This is done <strong>if the last menstrual period start date is not accurate or if the date of ovulation differs from the normal date<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Example<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If the last menstrual period started on 1 January 2023, the expected delivery date would be 8 October 2023 (280 days later), which would be 31 weeks as of 1 August 2023.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Points of Attention:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The number of weeks of pregnancy is <strong>very important to monitor the health of the mother and the fetus<\/strong>. For this reason, <strong>regular visits to the doctor<\/strong> are recommended.<\/li>\n<\/ul>\n\n\n\n<p>Using this method, you can easily calculate your gestational week and expected delivery date, but the exact number of weeks is best confirmed by a doctor.<\/p>\n\n\n\n<div id=\"pregnancy_calculator\">\n\t<div class=\"preg_calc_info\">\n\t\t<h3>Pregnancy Weeks Calculator<\/h3>\n\t\t<p>Please enter the date of your last menstrual period\uff1a<\/p>\n\t\t<div class=\"preg_calc\">\n\t\t\t<input type=\"date\" id=\"lastMenstrualDate\">\n\t\t\t<button onclick=\"displayPregnancyWeeks()\">Calculate.<\/button>\n\t\t<\/div>\n\t\t<p>The current number of weeks of pregnancy is: <span id=\"result\"><\/span><\/p>\n\t<\/div>\n<\/div>\n  \n  <script>\n\tfunction calculatePregnancyWeeks(lastMenstrualDate) {\n\t  \/\/ Convert the last menstrual date to a Date object\n\t  const startDate = new Date(lastMenstrualDate);\n  \n\t  \/\/ Get today's date\n\t  const today = new Date();\n  \n\t  \/\/ Calculate the difference in days\n\t  const timeDiff = today - startDate;\n  \n\t  \/\/ Convert the days to weeks\n\t  const weeks = Math.floor(timeDiff \/ (1000 * 60 * 60 * 24 * 7));\n  \n\t  return weeks;\n\t}\n  \n\tfunction displayPregnancyWeeks() {\n\t  const lastMenstrualDate = document.getElementById('lastMenstrualDate').value;\n\t  const pregnancyWeeks = calculatePregnancyWeeks(lastMenstrualDate);\n\t  document.getElementById('result').textContent = ` ${pregnancyWeeks} week`;\n\t}\n  <\/script>\n","protected":false},"excerpt":{"rendered":"<p>The calculation of the number of weeks of pregnancy is based on the start of the last&#8230;<\/p>\n","protected":false},"author":5,"featured_media":2051,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[34,71],"class_list":{"0":"post-2664","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-about-pregnancy-en","8":"tag-beginner-en","9":"tag-parent_child-en","10":"article"},"acf":[],"_links":{"self":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/posts\/2664","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/comments?post=2664"}],"version-history":[{"count":5,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/posts\/2664\/revisions"}],"predecessor-version":[{"id":5649,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/posts\/2664\/revisions\/5649"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/media\/2051"}],"wp:attachment":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/media?parent=2664"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/categories?post=2664"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/tags?post=2664"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}