{"id":12124,"date":"2026-03-26T20:29:07","date_gmt":"2026-03-26T11:29:07","guid":{"rendered":"https:\/\/miragen.clinic\/vitamin-d-test\/"},"modified":"2026-07-10T21:29:04","modified_gmt":"2026-07-10T12:29:04","slug":"vitamin-d-test","status":"publish","type":"page","link":"https:\/\/miragen.clinic\/en\/vitamin-d-test\/","title":{"rendered":"Vitamin D Test"},"content":{"rendered":"\n<div class=\"wp-block-group has-custom-color-4-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-e96bc7c8 wp-block-group-is-layout-constrained\" style=\"padding-top:240px;padding-right:var(--wp--preset--spacing--superbspacing-small);padding-bottom:240px;padding-left:var(--wp--preset--spacing--superbspacing-small)\">\n<p class=\"has-custom-color-6-color has-text-color has-link-color wp-elements-9ab3840d1f02b8c6f2441cb2a465d08f wp-block-paragraph\">Tests<\/p>\n\n\n\n<h1 class=\"wp-block-heading has-text-align-left has-custom-color-1-color has-text-color has-link-color wp-elements-77bfe8ddd8a4956c4a6909174c6ce5f0\">Vitamin D Test | Check for vitamin D deficiency, which affects immunity and the skin barrier<\/h1>\n<\/div>\n\n<div class=\"wp-block-group has-custom-color-2-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-1b17c90e wp-block-group-is-layout-constrained\" style=\"margin-top:0;margin-bottom:0;padding-top:var(--wp--preset--spacing--superbspacing-xlarge);padding-right:var(--wp--preset--spacing--superbspacing-small);padding-bottom:var(--wp--preset--spacing--superbspacing-xlarge);padding-left:var(--wp--preset--spacing--superbspacing-small)\">\n<div class=\"wp-block-rank-math-toc-block has-custom-color-5-color has-custom-color-11-background-color has-text-color has-background has-link-color wp-elements-a04460d5416165ca501c2f689618f63b\" style=\"padding-top:var(--wp--preset--spacing--superbspacing-xsmall);padding-right:0;padding-bottom:var(--wp--preset--spacing--superbspacing-xsmall);padding-left:0\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li class=\"\"><a href=\"#sec-1\">1. What is a vitamin D test?<\/a><\/li><li class=\"\"><a href=\"#sec-2\">2. Atopic dermatitis and vitamin D<\/a><\/li><li class=\"\"><a href=\"#sec-3\">3. Test cost<\/a><\/li><li class=\"\"><a href=\"#sec-4\">4. Interpreting results and supplementation<\/a><\/li><li class=\"\"><a href=\"#sec-faq\">Frequently Asked Questions<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"sec-1\">1. What is a vitamin D test?<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-custom-color-5-color has-alpha-channel-opacity has-custom-color-5-background-color has-background is-style-wide\" style=\"margin-top:var(--wp--preset--spacing--superbspacing-xsmall);margin-bottom:var(--wp--preset--spacing--superbspacing-xsmall)\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">A vitamin D test measures the level of 25-OH vitamin D in the blood to assess your body\u2019s vitamin D status. It is performed with a single blood draw, and results are reported in ng\/mL. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vitamin D is directly involved in regulating immune system balance. Specifically, the following mechanisms are known. <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Regulation of Th1\/Th2 balance<\/strong> \u2014 Vitamin D suppresses excessive Th1 and Th17 responses and promotes the production of regulatory T cells (Treg), helping to reduce immune hypersensitivity.<\/li>\n\n\n\n<li><strong>Maintaining the skin barrier<\/strong> \u2014 Vitamin D contributes to maintaining skin barrier function by supporting epidermal differentiation and ceramide synthesis. It may help compensate for the barrier damage commonly seen in patients with atopic dermatitis. <\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For these reasons, checking vitamin D levels in patients with <a href=\"https:\/\/miragen.clinic\/en\/atopic-dermatitis\/\">atopic dermatitis<\/a> can be practically helpful in determining the direction of treatment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"sec-2\">2. Atopic dermatitis and vitamin D<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-custom-color-5-color has-alpha-channel-opacity has-custom-color-5-background-color has-background is-style-wide\" style=\"margin-top:var(--wp--preset--spacing--superbspacing-xsmall);margin-bottom:var(--wp--preset--spacing--superbspacing-xsmall)\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">According to the Korea National Health and Nutrition Examination Survey, about 80\u201390% of Korean adults have vitamin D insufficiency (below 30 ng\/mL). In addition, patients with atopic dermatitis are more likely to become vitamin D deficient because itching often reduces outdoor activity. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In fact, studies have shown that blood vitamin D levels in patients with atopic dermatitis are significantly lower than in healthy controls, and lower vitamin D levels have also been reported to be associated with greater atopic dermatitis severity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In a 2024 meta-analysis (11 randomized controlled trials, 686 participants), the vitamin D supplementation group showed a significant reduction in SCORAD scores compared with the control group.<sup><a style=\"color: inherit;\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/39683522\/\" target=\"_blank\" rel=\"noopener\">1<\/a><\/sup> In addition, in a trial combining vitamin D 1,600 IU and vitamin E 600 IU for 60 days, SCORAD decreased by 64.3%, confirming a clearer synergy than vitamin D alone (34.8%).<sup><a style=\"color: inherit;\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/20653487\/\" target=\"_blank\" rel=\"noopener\">2<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, atopic dermatitis is not cured by vitamin D supplementation alone. The goal is to improve treatment outcomes by correcting vitamin D deficiency while maintaining basic care such as moisturization and medication. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"sec-3\">3. Test cost<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-custom-color-5-color has-alpha-channel-opacity has-custom-color-5-background-color has-background is-style-wide\" style=\"margin-top:var(--wp--preset--spacing--superbspacing-xsmall);margin-bottom:var(--wp--preset--spacing--superbspacing-xsmall)\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">The test is performed by drawing a small amount of blood, and no special preparation is required. You do not need to fast, and results are usually available within 3\u20135 days. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When performed for atopic dermatitis, the vitamin D test is a non-covered service, and the test cost at our clinic is KRW 30,000.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you also undergo an <a href=\"https:\/\/miragen.clinic\/en\/allergy-test-mast\/\">allergy test<\/a>, both tests can be performed with a single blood draw, so no additional blood draw is needed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"sec-4\">4. Interpreting results and supplementation<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-custom-color-5-color has-alpha-channel-opacity has-custom-color-5-background-color has-background is-style-wide\" style=\"margin-top:var(--wp--preset--spacing--superbspacing-xsmall);margin-bottom:var(--wp--preset--spacing--superbspacing-xsmall)\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Interpretation and recommended supplement doses by vitamin D level are as follows.<sup><a style=\"color: inherit;\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/21646368\/\" target=\"_blank\" rel=\"noopener\">3<\/a><\/sup><\/p>\n\n\n\n<ul class=\"wp-block-list has-custom-color-5-color has-text-color has-link-color wp-elements-7e5ef9088600428a7d9e5a2ac60fea88\">\n<li><strong>30 ng\/mL or higher<\/strong> (sufficient) \u2014 Maintenance dose: 1,000 IU daily<\/li>\n\n\n\n<li><strong>20\u201330 ng\/mL<\/strong> (insufficient) \u2014 1,000\u20132,000 IU daily<\/li>\n\n\n\n<li><strong>10\u201320 ng\/mL<\/strong> (deficient) \u2014 Supplement 4,000 IU daily for 6\u20138 weeks, then switch to a maintenance dose<\/li>\n\n\n\n<li><strong>Below 10 ng\/mL<\/strong> (severe deficiency) \u2014 High-dose oral supplementation or a vitamin D injection; even if you receive an injection, start an oral maintenance supplement (1,000\u20132,000 IU\/day) at the same time<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If you are diagnosed with vitamin D deficiency, oral vitamin D supplements are covered by National Health Insurance. Vitamin D injections (200,000 IU) are not covered, and cost KRW 30,000 at our clinic. After starting supplementation, we re-test after 2 months to confirm that levels have recovered sufficiently and then adjust the dose.  <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Studies suggest that supplementing vitamin D together with vitamin E may further improve atopic dermatitis symptoms.<sup><a style=\"color: inherit;\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/20653487\/\" target=\"_blank\" rel=\"noopener\">2<\/a><\/sup> We recommend taking vitamin E 600 IU daily together with a natural d-alpha-tocopherol product. However, if you are taking anticoagulants or antiplatelet agents (warfarin, aspirin, etc.) or are scheduled for surgery, vitamin E may increase the risk of bleeding, so please consult your doctor before deciding whether to take it. <\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/miragen.clinic\/wp-content\/uploads\/2026\/06\/vitamin-d-level-supplement-guide-EN.png\" alt=\"A guide infographic visualizing deficiency stages and recommended supplement doses by level based on vitamin D test results, in a thermometer format\" class=\"wp-image-9659\" title=\"Vitamin D supplementation guide infographic by level\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"&#xCC38;&#xACE0;&#xBB38;&#xD5CC;\">References<\/h3>\n\n\n\n<ol class=\"wp-block-list has-custom-color-5-color has-text-color has-link-color has-superbfont-xxsmall-font-size wp-elements-19637b52dce477e7d469ecd72cf52d17\">\n<li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/39683522\/\" target=\"_blank\" rel=\"noopener\"><em>Nielsen AY et al. Vitamin D Supplementation for Treating Atopic Dermatitis in Children and Adults: A Systematic Review and Meta-Analysis. Nutrients. 2024;16(23):4128.   <\/em><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/20653487\/\" target=\"_blank\" rel=\"noopener\"><em>Javanbakht MH et al. Randomized controlled trial using vitamins E and D supplementation in atopic dermatitis. J Dermatolog Treat. 2011;22(3):144-50.   <\/em><\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/21646368\/\" target=\"_blank\" rel=\"noopener\"><em>Holick MF et al. Evaluation, treatment, and prevention of vitamin D deficiency: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2011;96(7):1911-30.   <\/em><\/a><\/li>\n<\/ol>\n<\/div>\n\n<div class=\"wp-block-group has-custom-color-6-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-4c3b03bf wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--superbspacing-xlarge);padding-right:var(--wp--preset--spacing--superbspacing-small);padding-bottom:var(--wp--preset--spacing--superbspacing-xlarge);padding-left:var(--wp--preset--spacing--superbspacing-small)\">\n<h2 class=\"wp-block-heading\" id=\"sec-faq\">Frequently Asked Questions<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-custom-color-5-color has-alpha-channel-opacity has-custom-color-5-background-color has-background is-style-wide\" style=\"margin-top:var(--wp--preset--spacing--superbspacing-xsmall);margin-bottom:var(--wp--preset--spacing--superbspacing-xsmall)\"\/>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-q-a1b2c3d4e5\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">Do I need to fast for a vitamin D test?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>No. A vitamin D test can be performed regardless of whether you have fasted. <\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-b2c3d4e5f6\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">Is the vitamin D test covered by insurance?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>For atopic dermatitis alone, it is not covered by National Health Insurance and costs KRW 30,000 as a non-covered service. Coverage may apply if you have certain diagnoses, such as osteoporosis. <\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-c3d4e5f6a7\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">If I\u2019m low in vitamin D, do I have to take supplements?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>If your level is below 20 ng\/mL (deficiency), supplementation is recommended. If it is in the insufficient range (20\u201330 ng\/mL), we first review your diet and sun exposure before deciding. <\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-d4e5f6a7b8\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">Can I get it together with an allergy test?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Yes, the vitamin D test and an allergy test can be performed at the same time with a single blood draw.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-e5f6a7b8c9\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">I\u2019m already taking a vitamin D supplement\u2014can I still get tested?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Yes, testing is actually recommended to confirm whether your current supplementation is appropriate. Please let us know the product and dose you are taking during your visit. <\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Tests Vitamin D Test | Check for vitamin D deficiency, which affects immunity and the skin barrier 1. What is a vitamin D test? A vitamin D test measures the level of 25-OH vitamin D in the blood to assess your body\u2019s vitamin D status. It is performed with a single blood draw, and results [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":12125,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-full-width","meta":{"_miragen_jsonld":"","footnotes":""},"class_list":["post-12124","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/miragen.clinic\/en\/wp-json\/wp\/v2\/pages\/12124","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/miragen.clinic\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/miragen.clinic\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/miragen.clinic\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/miragen.clinic\/en\/wp-json\/wp\/v2\/comments?post=12124"}],"version-history":[{"count":8,"href":"https:\/\/miragen.clinic\/en\/wp-json\/wp\/v2\/pages\/12124\/revisions"}],"predecessor-version":[{"id":13043,"href":"https:\/\/miragen.clinic\/en\/wp-json\/wp\/v2\/pages\/12124\/revisions\/13043"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/miragen.clinic\/en\/wp-json\/wp\/v2\/media\/12125"}],"wp:attachment":[{"href":"https:\/\/miragen.clinic\/en\/wp-json\/wp\/v2\/media?parent=12124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}