{"id":108655,"date":"2023-07-10T09:25:11","date_gmt":"2023-07-10T07:25:11","guid":{"rendered":"https:\/\/ivi-fertility.com\/?p=108655"},"modified":"2023-07-10T14:44:42","modified_gmt":"2023-07-10T12:44:42","slug":"how-do-hormones-control-the-menstrual-cycle","status":"publish","type":"post","link":"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/","title":{"rendered":"How do Hormones control the Menstrual Cycle?"},"content":{"rendered":"<p><strong>How do hormones control the menstrual cycle?<\/strong> The menstrual cycle is regulated by an interaction between reproductive hormones: <strong>LH, FSH, estradiol, and progesterone<\/strong>. This process results in follicular growth, ovulation, and the formation of the corpus luteum. If there is no pregnancy, the decrease in progesterone levels leads to the shedding of the endometrial lining and the restart of the cycle every month.<\/p>\n<p>Today we will talk about how hormones control the menstrual cycle. What are these hormones and what is the function of each one? What are the typical hormonal changes during the cycle?<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_68_1 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/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: #999;color:#999\" 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: #999;color:#999\" 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:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#What_are_the_4_main_hormones_in_the_female_menstrual_cycle\" title=\"What are the 4 main hormones in the female menstrual cycle?\">What are the 4 main hormones in the female menstrual cycle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#How_do_hormones_control_the_menstrual_cycle\" title=\"How do hormones control the menstrual cycle?\">How do hormones control the menstrual cycle?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#Follicular_Phase\" title=\"Follicular Phase\">Follicular Phase<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#FSH_Window_Stage\" title=\"FSH Window Stage\">FSH Window Stage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#Ovulation_and_Luteal_Phase\" title=\"Ovulation and Luteal Phase\">Ovulation and Luteal Phase<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#End_of_the_Cycle\" title=\"End of the Cycle\">End of the Cycle<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#Hormone_levels_during_the_menstrual_cycle\" title=\"Hormone levels during the menstrual cycle\">Hormone levels during the menstrual cycle<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#FSH_Levels\" title=\"FSH Levels\">FSH Levels<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#LH_Levels\" title=\"LH Levels\">LH Levels<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#Estradiol_Levels\" title=\"Estradiol Levels\">Estradiol Levels<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#Progesterone_Levels\" title=\"Progesterone Levels\">Progesterone Levels<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/#Consultation_with_an_IVI_specialist\" title=\"Consultation with an IVI specialist\">Consultation with an IVI specialist<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_are_the_4_main_hormones_in_the_female_menstrual_cycle\"><\/span>What are the 4 main hormones in the female menstrual cycle?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The menstrual cycle has an <strong>approximate duration of 28 days<\/strong> from the first day of bleeding to the first day of bleeding of the next cycle. This period can vary and range between 21 and 35 days. Irregularity in menstrual cycles is known as <strong>oligomenorrhea<\/strong>, and the complete absence of menstruation is known as <strong>amenorrhea<\/strong>.<\/p>\n<p>The menstrual cycle is controlled by four hormones that interact with each other. They are as follows:<\/p>\n<ul>\n<li><strong>FSH hormone<\/strong>, which contributes to egg production and follicular growth.<\/li>\n<li><strong>Estradiol<\/strong>, which acts on the dominant follicle.<\/li>\n<li><strong>LH hormone<\/strong>, which regulates the cycle itself and ovulation.<\/li>\n<li><strong>Progesterone<\/strong>, which has an effect on the endometrium, preparing it for embryo implantation.<\/li>\n<\/ul>\n<p>Next, we will see in more detail how these hormonal changes occur during the menstrual cycle.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_do_hormones_control_the_menstrual_cycle\"><\/span>How do hormones control the menstrual cycle?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Let&#8217;s now look at the different stages of the menstrual cycle, which are determined by the interaction of hormones.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Follicular_Phase\"><\/span>Follicular Phase<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>At the beginning of the cycle, there is a slight increase in FSH hormone levels, which stimulate follicular growth in the ovary. The first part of the menstrual cycle is mainly focused on follicular growth and the selection of a single dominant follicle. That&#8217;s why this initial stage is known as the <strong>follicular phase<\/strong>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"FSH_Window_Stage\"><\/span>FSH Window Stage<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>As the follicles grow, they produce <strong>estradiol and inhibin B<\/strong>. Inhibin and decreased levels of estradiol exert negative feedback on the hypothalamic-pituitary-gonadal axis. This leads to a decrease in FSH levels, contributing to the selection of the <strong>dominant follicle<\/strong>. This is possible because larger follicles require less FSH to grow, while smaller ones are delayed because they need sustained hormone release. This period is known as the <strong>FSH window<\/strong> and leads to the selection of the dominant follicle.<\/p>\n<p>As the dominant follicle continues to grow, it continues to synthesize estradiol. As estradiol levels increase, there is a shift in feedback mechanisms from negative to positive, resulting in an increase in LH levels.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ovulation_and_Luteal_Phase\"><\/span>Ovulation and Luteal Phase<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The mid-cycle surge in LH levels, lasting 36-48 hours, triggers ovulation or<strong> the release of the mature oocyte from the follicle<\/strong>. The remaining follicle forms what is known as the &#8220;corpus luteum.&#8221; This structure secretes progesterone, reaching its peak levels in the last 14 days of the cycle. This constitutes the luteal phase. The presence of elevated progesterone levels in the middle of this phase indicates that ovulation has occurred.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"End_of_the_Cycle\"><\/span>End of the Cycle<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Progesterone prepares the endometrium for embryo implantation if fertilization of the oocyte has occurred. The presence of an embryo induces the secretion of <strong>hCG hormone<\/strong>, which helps maintain the function of the corpus luteum. This allows it to continue producing progesterone and sustain the pregnancy.<\/p>\n<p>If fertilization and embryo implantation do not occur, the corpus luteum will regress, leading to a decrease in progesterone levels. This drop in progesterone concentrations leads to the shedding of the endometrial lining and menstrual bleeding, marking the start of a new cycle.<\/p>\n<p><img decoding=\"async\" class=\"alignnone  wp-image-108656\" src=\"https:\/\/ivi-fertility.com\/wp-content\/uploads\/sites\/12\/2023\/06\/hormones-300x200.jpeg\" alt=\"\" width=\"464\" height=\"309\" srcset=\"https:\/\/ivi-fertility.com\/wp-content\/uploads\/sites\/12\/2023\/06\/hormones-300x200.jpeg 300w, https:\/\/ivi-fertility.com\/wp-content\/uploads\/sites\/12\/2023\/06\/hormones-768x511.jpeg 768w, https:\/\/ivi-fertility.com\/wp-content\/uploads\/sites\/12\/2023\/06\/hormones-540x358.jpeg 540w, https:\/\/ivi-fertility.com\/wp-content\/uploads\/sites\/12\/2023\/06\/hormones-255x169.jpeg 255w, https:\/\/ivi-fertility.com\/wp-content\/uploads\/sites\/12\/2023\/06\/hormones-200x133.jpeg 200w, https:\/\/ivi-fertility.com\/wp-content\/uploads\/sites\/12\/2023\/06\/hormones-700x466.jpeg 700w, https:\/\/ivi-fertility.com\/wp-content\/uploads\/sites\/12\/2023\/06\/hormones.jpeg 1000w\" sizes=\"(max-width: 464px) 100vw, 464px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Hormone_levels_during_the_menstrual_cycle\"><\/span>Hormone levels during the menstrual cycle<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To measure hormone levels,<strong> a test called hormonal determination<\/strong> is conducted. The results of this test can vary depending on age, sex, or health history. The specific laboratory where the test is performed can also influence the results.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"FSH_Levels\"><\/span>FSH Levels<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>FSH hormone levels are measured in mIU\/mL (milli-international units per milliliter). In the case of women, the results can vary depending on the phase of the menstrual cycle. Additionally, there are numerous factors that can cause FSH levels to be either too high or too low. The <strong>normal results<\/strong> are as follows:<\/p>\n<ul>\n<li>4-9.9 mIU\/mL during the follicular phase<\/li>\n<li>2-17.2 mIU\/mL during the peak LH ovulatory phase<\/li>\n<li>1-9.2 mIU\/mL during the luteal phase<\/li>\n<li>3-100.6 mIU\/mL after menopause<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"LH_Levels\"><\/span>LH Levels<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Regarding LH, the<strong> normal ranges<\/strong> are as follows:<\/p>\n<ul>\n<li>68-15.0 mIU\/mL for the follicular phase<\/li>\n<li>9-56.6 mIU\/mL during the ovulatory peak<\/li>\n<li>61-16.3 mIU\/mL during the luteal phase<\/li>\n<li>2-52.3 mIU\/mL during menopause<\/li>\n<\/ul>\n<p>Abnormally high levels of LH during non-ovulatory periods could be indicative of<a href=\"https:\/\/ivi-fertility.com\/blog\/menopause\/\"> menopause<\/a>. They can also reveal polycystic ovary syndrome, a pituitary disorder, nutritional issues, or a stressful situation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Estradiol_Levels\"><\/span>Estradiol Levels<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Normal estradiol levels<\/strong> can vary significantly depending on the time period considered. In a normal menstrual cycle, estradiol levels fluctuate as follows:<\/p>\n<ul style=\"list-style-type: disc\">\n<li>&lt;50 pg\/mL during menstrual periods<\/li>\n<li>200 pg\/mL (maximum) during follicular development<\/li>\n<li>400 pg\/mL (maximum) just before ovulation<\/li>\n<\/ul>\n<p>The concentration briefly drops during ovulation and rises again during the luteal phase.<\/p>\n<p>In the absence of pregnancy, estradiol levels decrease to their minimum concentrations at the end of the luteal phase.<\/p>\n<p>If there is pregnancy, estradiol levels steadily increase until the fetus is fully mature. This estradiol comes from the placenta.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Progesterone_Levels\"><\/span>Progesterone Levels<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Progesterone levels are measured in nanograms per milliliter (ng\/mL). The normal levels are as follows:<\/p>\n<ul>\n<li>to 0.3 ng\/mL for prepubertal girls<\/li>\n<li>to 0.7 ng\/mL during the follicular stage of the menstrual cycle<\/li>\n<li>to 25 ng\/mL during the luteal stage of the menstrual cycle<\/li>\n<li>10 to 44 ng\/mL during the first trimester of pregnancy<\/li>\n<li>5 to 82.5 ng\/mL during the second trimester of pregnancy<\/li>\n<li>65 to 290 ng\/mL during the third trimester of pregnancy<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Consultation_with_an_IVI_specialist\"><\/span>Consultation with an IVI specialist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Despite the information provided by measurements, it is always necessary to consult the results of the analyses with a specialist to establish a diagnosis. If you would like to schedule tests and analyses, consult with an IVI specialist who will advise you regarding any abnormalities in your cycle. We are world leaders in fertility treatments. <a href=\"https:\/\/ivi-fertility.com\/ask-for-an-appointment\/\">Call us or leave your information in the contact form, and our team will get in touch with you.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"How do hormones control the menstrual cycle? The menstrual cycle is regulated by an interaction between reproductive hormones: LH, FSH, estradiol, and progesterone. This process results in follicular growth, ovulation, and the formation of the corpus luteum. If there is no pregnancy, the decrease in progesterone levels leads to the shedding of the endometrial lining&#8230; <a class=\"view-article\" href=\"https:\/\/ivi-fertility.com\/blog\/how-do-hormones-control-the-menstrual-cycle\/\">View Article<\/a>","protected":false},"author":34,"featured_media":108658,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[257,218,64],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How do hormones control the menstrual cycle: phases, levels<\/title>\n<meta name=\"description\" content=\"How do Hormones control the Menstrual Cycle? What are these hormones and what is the function of each one? 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