{"id":10565,"date":"2026-08-17T00:15:40","date_gmt":"2026-08-17T08:15:40","guid":{"rendered":"https:\/\/www.osmosis.org\/blog\/?p=10565"},"modified":"2026-07-02T16:43:37","modified_gmt":"2026-07-03T00:43:37","slug":"usmle-step-1-question-of-the-day-vitamin-k","status":"publish","type":"post","link":"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vitamin-k","title":{"rendered":"USMLE\u00ae Step 1 Question of the Day:\u00a0Vitamin K"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-center 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\">In This Article<\/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:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vitamin-k\/#The_correct_answer_to_todays_USMLE%C2%AE_Step_1_Question_is%E2%80%A6\" >The correct answer to today\u2019s USMLE\u00ae Step 1 Question is\u2026<\/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.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vitamin-k\/#Incorrect_Answer_Explanations\" >Incorrect Answer Explanations<\/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.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vitamin-k\/#Main_Explanation\" >Main Explanation<\/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.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vitamin-k\/#Major_Takeaway\" >Major Takeaway&nbsp;<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vitamin-k\/#Want_to_learn_more_about_this_topic\" >Want to learn more about this topic?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.osmosis.org\/blog\/usmle-step-1-question-of-the-day-vitamin-k\/#References\" >References<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\"><strong><em>Today\u2019s USMLE\u00ae Step 1 question of the day features a 23-year-old woman who wants to know more about newborn&#8217;s need for Vitamin K. What&#8217;s the answer to her question? Let\u2019s find out!<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A 23-year-old primigravid woman who is planning a home birth\u00a0asks whether her newborn will need\u00a0<strong>vitamin K<\/strong>\u00a0administration after delivery. The physician explains that newborns are at increased risk for\u00a0<strong>vitamin K deficiency bleeding (VKDB)<\/strong>\u00a0without prophylaxis. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Which of the following <em>best<\/em> explains why neonates require Vitamin K administration?\u00a0<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A. Markedly increased vitamin K requirements during the neonatal period<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B. Inability of neonates to absorb vitamin K present in breast milk<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C. Inability to store vitamin K due to low body fat content<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>D. Inability to recycle vitamin K after it is used in coagulation reactions<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>E. Insufficient intestinal colonization by vitamin K\u2013producing bacteria<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><em>Scroll down for the correct answer!<\/em><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Learn with Osmosis\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/iDxHtjjCMbU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_correct_answer_to_todays_USMLE%C2%AE_Step_1_Question_is%E2%80%A6\"><\/span>The correct answer to today\u2019s USMLE\u00ae Step 1 Question is\u2026<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>E. Insufficient intestinal colonization by vitamin K\u2013producing bacteria<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Correct:<\/strong> See Main Explanation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Incorrect_Answer_Explanations\"><\/span>Incorrect Answer Explanations<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A. Markedly increased vitamin K requirements during the neonatal period<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Incorrect:<\/strong> Neonatal vitamin K deficiency is primarily caused by decreased vitamin K availability rather than increased physiologic demand.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B. Inability of neonates to absorb vitamin K present in breast milk<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Incorrect:<\/strong> Neonates are capable of absorbing vitamin K. However, breast milk contains relatively low amounts of vitamin K, which contributes to low neonatal vitamin K stores.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C. Inability to store vitamin K due to low body fat content<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Incorrect:<\/strong> Neonates are able to store vitamin K. The deficiency primarily results from low endogenous and exogenous vitamin K supply.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>D. Inability to recycle vitamin K after it is used in coagulation reactions<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Incorrect:<\/strong> Neonates possess functional vitamin K epoxide reductase, the enzyme responsible for recycling vitamin K. Although enzyme activity may be somewhat reduced compared with adults, recycling still occurs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Main_Explanation\"><\/span>Main Explanation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Vitamin K<\/strong>&nbsp;is a fat-soluble vitamin&nbsp;required&nbsp;for&nbsp;<strong>\u03b3-carboxylation<\/strong>&nbsp;of&nbsp;<strong>clotting factors<\/strong>&nbsp;<strong>II<\/strong>,&nbsp;<strong>VII<\/strong>,&nbsp;<strong>IX<\/strong>, and&nbsp;<strong>X<\/strong>, as well as&nbsp;<strong>proteins C<\/strong>&nbsp;and&nbsp;<strong>S<\/strong>.&nbsp;This modification activates clotting factors involved in&nbsp;<strong>secondary hemostasis<\/strong>&nbsp;and directly contributes to&nbsp;<strong>coagulation<\/strong>. Therefore, a deficiency&nbsp;of&nbsp;vitamin K&nbsp;in a neonate&nbsp;can lead to&nbsp;<strong>serious bleeding<\/strong>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For most adults, vitamin K is easily obtained through dietary sources. Vitamin K is also produced endogenously by vitamin K\u2013producing intestinal bacteria.&nbsp;However, neonates are at risk for&nbsp;<strong>vitamin K deficiency<\/strong>&nbsp;because both endogenous and exogenous sources of vitamin K are limited after birth.&nbsp;<strong>Endogenous vitamin K production<\/strong>&nbsp;is low because the neonatal intestine has not yet been sufficiently colonized by vitamin K\u2013producing bacteria.&nbsp;<strong>Exogenous vitamin K supply<\/strong>&nbsp;is also limited due to low placental transfer before birth and the&nbsp;relatively low&nbsp;concentration of vitamin K in breast milk.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because of these factors, newborns routinely receive&nbsp;<strong>intramuscular vitamin K&nbsp;prophylaxis<\/strong>&nbsp;shortly after birth to prevent&nbsp;<strong>vitamin K deficiency bleeding (VKDB)<\/strong>, which may present with gastrointestinal bleeding, mucosal bleeding, or intracranial hemorrhage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Major_Takeaway\"><\/span>Major Takeaway&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Neonatal vitamin K deficiency<\/strong>\u00a0is due to\u00a0decreased\u00a0<strong>endogenous sources<\/strong>\u00a0(insufficient intestinal colonization by vitamin K\u2013producing bacteria) and decreased\u00a0<strong>exogenous sources<\/strong>\u00a0(limited placental transfer and low vitamin K concentration in breast milk). Newborns routinely receive\u00a0<strong>vitamin K prophylaxis<\/strong>\u00a0to prevent\u00a0<strong>vitamin K deficiency bleeding (VKDB)<\/strong>.\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Want_to_learn_more_about_this_topic\"><\/span>Want to learn more about this topic?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Watch this Osmosis video:<\/strong> <a href=\"https:\/\/www.osmosis.org\/learn\/Role_of_Vitamin_K_in_coagulation\">Role of Vitamin K in coagulation<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"References\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hand, I., Noble, L., Abrams, S. A., COMMITTEE ON FETUS AND NEWBORN, SECTION ON BREASTFEEDING, &amp; COMMITTEE ON NUTRITION. (2022).\u00a0<strong><em>Vitamin K and the newborn infant<\/em>.<\/strong>\u00a0<em>Pediatrics, 149<\/em>(3), e2021056036.\u00a0<a href=\"https:\/\/doi.org\/10.1542\/peds.2021-056036\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1542\/peds.2021-056036<\/a>\u00a0\u00a0<\/li>\n\n\n\n<li>Shearer, M. J. (2018).\u00a0<em><strong>Vitamin K deficiency bleeding (VKDB) in early infancy<\/strong><\/em>.\u00a0<em>Blood Reviews, 32<\/em>(3), 225\u2013234.\u00a0<a href=\"https:\/\/doi.org\/10.1016\/j.blre.2017.11.001\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1016\/j.blre.2017.11.001<\/a>\u00a0<\/li>\n\n\n\n<li>Lippi, G., &amp; Franchini, M. (2011). <strong>Vitamin\u00a0K in\u00a0neonates: facts and myths.<\/strong> Blood transfusion =\u00a0Trasfusione\u00a0del\u00a0sangue, 9(1), 4\u20139.\u00a0<a href=\"https:\/\/doi.org\/10.2450\/2010.0034-10\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.2450\/2010.0034-10<\/a>\u00a0<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"http:\/\/osmosis.org\/plans\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"250\" src=\"https:\/\/www.osmosis.org\/blog\/wp-content\/uploads\/sites\/2\/2020\/09\/Blog_Display_Ads_MD1_2023.png?w=700\" alt=\"\" class=\"wp-image-5904\" srcset=\"https:\/\/www.osmosis.org\/blog\/wp-content\/uploads\/sites\/2\/2020\/09\/Blog_Display_Ads_MD1_2023.png 700w, https:\/\/www.osmosis.org\/blog\/wp-content\/uploads\/sites\/2\/2020\/09\/Blog_Display_Ads_MD1_2023.png?resize=300,107 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Want more practice questions? Get your\u00a0<a href=\"https:\/\/www.osmosis.org\/plans\" target=\"_blank\" rel=\"noreferrer noopener\">free trial<\/a>\u00a0and discover why millions of clinicians and caregivers love learning by Osmosis.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why do newborns routinely receive vitamin K after birth? Challenge your understanding of neonatal physiology and coagulation with this high-yield USMLE-style clinical scenario.<\/p>\n","protected":false},"author":208,"featured_media":10568,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[27,20,16,1366,1369,44],"tags":[2967,3108,3257,3106,84,3253,3151,3255,3077,3256,742,664,3252,3254],"class_list":["post-10565","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medicine","category-exam-prep","category-do","category-questions","category-step-1-questions","category-step-1","tag-board-exam-prep","tag-clinical-vignette","tag-coagulation","tag-hematology","tag-medical-education","tag-neonatal-physiology","tag-newborn-care","tag-newborn-health","tag-pediatrics","tag-physiology","tag-preventive-medicine","tag-usmle-step-1","tag-vitamin-k","tag-vkdb"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.6 - 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