{"id":9034,"date":"2026-04-17T16:18:33","date_gmt":"2026-04-17T16:18:33","guid":{"rendered":"https:\/\/www.better2know.co.uk\/blog\/?p=9034"},"modified":"2026-04-17T16:24:04","modified_gmt":"2026-04-17T16:24:04","slug":"how-accurate-are-blood-tests-for-herpes","status":"publish","type":"post","link":"https:\/\/www.better2know.co.uk\/blog\/how-accurate-are-blood-tests-for-herpes\/","title":{"rendered":"How accurate are blood tests for Herpes?"},"content":{"rendered":"\n<p>When it comes to testing for sexually transmitted infections (STIs), accuracy matters. Many people searching <em>\u201chow accurate are blood tests for Herpes?\u201d<\/em> are looking for reassurance that their results can be trusted.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.better2know.co.uk\/page\/herpes\"><strong>Herpes<\/strong><\/a> is very common, often symptom\u2011free, and frequently misunderstood. Blood testing plays an important role in diagnosing Herpes when symptoms are absent, but, like all medical tests, it has limitations. Understanding how these tests work, when to take them, and what your results really mean can help you make informed decisions about your sexual health.<\/p>\n\n\n\n<p>In fact, across Better2Know\u2019s dataset of standalone Herpes tests, <strong>100% of patients chose a laboratory\u2011based IgG blood test<\/strong>, with <strong>0% relying on visual lesion swabs alone<\/strong>. This clear preference highlights just how important definitive, medical\u2011grade accuracy is when it comes to Herpes testing.<\/p>\n\n\n\n<!--more-->\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" width=\"752\" height=\"381\" src=\"https:\/\/www.better2know.co.uk\/blog\/wp-content\/uploads\/2026\/04\/image-4.jpeg\" alt=\"\" class=\"wp-image-9035\" srcset=\"https:\/\/www.better2know.co.uk\/blog\/wp-content\/uploads\/2026\/04\/image-4.jpeg 752w, https:\/\/www.better2know.co.uk\/blog\/wp-content\/uploads\/2026\/04\/image-4-300x152.jpeg 300w\" sizes=\"(max-width: 752px) 100vw, 752px\" \/><\/figure><\/div>\n\n\n\n<p class=\"has-text-align-center\"><strong>If you think you may have an STI, it\u2019s always better to know your sexual health status.<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"https:\/\/www.better2know.co.uk\/clinics\/book-online\/choose-clinic\">Get tested<\/a><\/div>\n<\/div>\n\n\n\n<h2>Why accuracy matters for STI tests<\/h2>\n\n\n\n<p>STI test results can affect your peace of mind, your relationships, and sometimes your treatment choices. An inaccurate result can either cause unnecessary anxiety or provide false reassurance.<\/p>\n\n\n\n<p>This is especially true for Herpes, where many people never develop <a href=\"https:\/\/www.better2know.co.uk\/blog\/symptoms-of-genital-herpes\/\"><strong>obvious symptoms<\/strong><\/a>. Accurate testing helps you understand your exposure history, reduce the risk of passing the infection to others, and take control of your sexual health with confidence.<\/p>\n\n\n\n<h2>What is Herpes?<\/h2>\n\n\n\n<p>Herpes is a viral infection caused by the Herpes simplex virus (HSV). There are <a href=\"https:\/\/www.better2know.co.uk\/blog\/herpes-oral-v-genital\/\"><strong>two main types<\/strong><\/a>:<\/p>\n\n\n\n<ul><li><strong>HSV\u20111<\/strong>, which most commonly causes oral Herpes (cold sores)<\/li><li><strong>HSV\u20112<\/strong>, which more commonly causes genital Herpes<\/li><\/ul>\n\n\n\n<p>Both types can be passed through skin\u2011to\u2011skin contact, including oral, vaginal, and anal sex. Once infected, the virus remains in the body for life, although symptoms may come and go, or never appear at all. This is one of the reasons testing can be complicated.<\/p>\n\n\n\n<h2>How do you test for Herpes?<\/h2>\n\n\n\n<p>There are two main ways to test for Herpes:<\/p>\n\n\n\n<ul><li><strong>Swab tests<\/strong>, which take a sample from a visible blister or sore<\/li><li><strong>Blood tests<\/strong>, which look for antibodies produced by the immune system in response to HSV<\/li><\/ul>\n\n\n\n<h2>How accurate are blood tests for Herpes?<\/h2>\n\n\n\n<p>A blood test to detect IgG antibodies remains the preferred test for most situations, and are highly accurate. PCR tests that use swab samples are also useful because they can detect the individual virus causing the symptoms.<\/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=\"How accurate are blood tests for Herpes?\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/KZrvDyGsCFc?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>When is it best to get tested for Herpes?<\/h2>\n\n\n\n<p>Timing plays a crucial role in Herpes testing accuracy.<\/p>\n\n\n\n<p>After infection, it takes time for your body to produce detectable antibodies. This period is known as the <strong>window period<\/strong>. Testing too early can result in a false negative. Antibodies usually begin to develop after <strong>three to four weeks<\/strong><\/p>\n\n\n\n<p>If you test negative but believe you were recently exposed, repeating the test later may be advised.<\/p>\n\n\n\n<h2>Are swab tests more accurate?<\/h2>\n\n\n\n<p>If you have visible sores or blisters, <a href=\"https:\/\/www.better2know.co.uk\/blog\/can-you-get-tested-for-herpes-without-an-outbreak\/\"><strong>a swab test is usually the most accurate way to diagnose Herpes<\/strong><\/a>. This is because the sample is taken directly from the affected area and can detect the virus itself.<\/p>\n\n\n\n<p>However, swabs are only effective when symptoms are present. Once sores begin to heal, accuracy decreases. Blood tests remain the best option when symptoms are absent or have already resolved.<\/p>\n\n\n\n<h2>FAQ<\/h2>\n\n\n\n<h3>Can Herpes be missed on a blood test?<\/h3>\n\n\n\n<p>Yes. If the test is taken too early, before antibodies have developed, Herpes can be missed. This is why understanding the window period is essential when relying on blood tests for Herpes detection.<\/p>\n\n\n\n<h3>If I test negative, should I get tested again?<\/h3>\n\n\n\n<p>If you tested within the window period or continue to have symptoms or concerns, retesting may be recommended. A healthcare professional can help interpret your result and advise whether follow\u2011up testing is appropriate.<\/p>\n\n\n\n<h2>Final thoughts<\/h2>\n\n\n\n<p>So, how accurate are blood tests for Herpes? When taken at the right time and properly interpreted, they\u2019re highly effective for detecting prior exposure to HSV, especially when no symptoms are present.<\/p>\n\n\n\n<p>At Better2Know, we use laboratory\u2011based Herpes blood tests designed to deliver reliable, confidential results, along with expert support to help you understand what those results mean. If you are unsure about the best test for you, our team is always here to help.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" width=\"752\" height=\"381\" src=\"https:\/\/www.better2know.co.uk\/blog\/wp-content\/uploads\/2026\/04\/image-5.jpeg\" alt=\"\" class=\"wp-image-9036\" srcset=\"https:\/\/www.better2know.co.uk\/blog\/wp-content\/uploads\/2026\/04\/image-5.jpeg 752w, https:\/\/www.better2know.co.uk\/blog\/wp-content\/uploads\/2026\/04\/image-5-300x152.jpeg 300w\" sizes=\"(max-width: 752px) 100vw, 752px\" \/><\/figure><\/div>\n\n\n\n<p class=\"has-text-align-center\"><strong>Don\u2019t leave your sexual health to chance.<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"https:\/\/www.better2know.co.uk\/clinics\/book-online\/choose-clinic\">Get tested<\/a><\/div>\n<\/div>\n\n\n\n<!-- Simple Share Buttons Adder (8.1.2) simplesharebuttons.com --><div class=\"ssba-classic-2 ssba ssbp-wrap left ssbp--theme-1\"><div style=\"text-align:left\"><span class=\"ssba-share-text\">Share this...<\/span><br\/><a data-site=\"\" class=\"ssba_facebook_share\" href=\"http:\/\/www.facebook.com\/sharer.php?u=https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/posts\/9034\"  target=\"_blank\" ><img src=\"https:\/\/www.better2know.co.uk\/blog\/wp-content\/plugins\/simple-share-buttons-adder\/buttons\/somacro\/facebook.png\" style=\"width: 35px;\" title=\"Facebook\" class=\"ssba ssba-img\" alt=\"Share on Facebook\" \/><div title=\"Facebook\" class=\"ssbp-text\">Facebook<\/div><\/a><a data-site='pinterest' class='ssba_pinterest_share' href='javascript:void((function()%7Bvar%20e=document.createElement(&apos;script&apos;);e.setAttribute(&apos;type&apos;,&apos;text\/javascript&apos;);e.setAttribute(&apos;charset&apos;,&apos;UTF-8&apos;);e.setAttribute(&apos;src&apos;,&apos;\/\/assets.pinterest.com\/js\/pinmarklet.js?r=&apos;+Math.random()*99999999);document.body.appendChild(e)%7D)());'><img src=\"https:\/\/www.better2know.co.uk\/blog\/wp-content\/plugins\/simple-share-buttons-adder\/buttons\/somacro\/pinterest.png\" style=\"width: 35px;\" title=\"Pinterest\" class=\"ssba ssba-img\" alt=\"Pin on Pinterest\" \/><div title=\"Pinterest\" class=\"ssbp-text\">Pinterest<\/div><\/a><a data-site=\"\" class=\"ssba_twitter_share\" href=\"http:\/\/twitter.com\/share?url=https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/posts\/9034&amp;text=How%20accurate%20are%20blood%20tests%20for%20Herpes%3F%20\"  target=&quot;_blank&quot; ><img src=\"https:\/\/www.better2know.co.uk\/blog\/wp-content\/plugins\/simple-share-buttons-adder\/buttons\/somacro\/twitter.png\" style=\"width: 35px;\" title=\"Twitter\" class=\"ssba ssba-img\" alt=\"Tweet about this on Twitter\" \/><div title=\"Twitter\" class=\"ssbp-text\">Twitter<\/div><\/a><a data-site=\"linkedin\" class=\"ssba_linkedin_share ssba_share_link\" href=\"http:\/\/www.linkedin.com\/shareArticle?mini=true&amp;url=https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/posts\/9034\"  target=&quot;_blank&quot; ><img src=\"https:\/\/www.better2know.co.uk\/blog\/wp-content\/plugins\/simple-share-buttons-adder\/buttons\/somacro\/linkedin.png\" style=\"width: 35px;\" title=\"LinkedIn\" class=\"ssba ssba-img\" alt=\"Share on LinkedIn\" \/><div title=\"Linkedin\" class=\"ssbp-text\">Linkedin<\/div><\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>When it comes to testing for sexually transmitted infections (STIs), accuracy matters. Many people searching \u201chow accurate are blood tests for Herpes?\u201d are looking for reassurance that their results can be trusted. Herpes is very common, often symptom\u2011free, and frequently misunderstood. Blood testing plays an important role in diagnosing Herpes when symptoms are absent, but, [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_s2mail":""},"categories":[6],"tags":[],"yst_prominent_words":[788,642,2165,2163,924,563,854,725,706,735,797,2825],"_links":{"self":[{"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/posts\/9034"}],"collection":[{"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=9034"}],"version-history":[{"count":2,"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/posts\/9034\/revisions"}],"predecessor-version":[{"id":9038,"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/posts\/9034\/revisions\/9038"}],"wp:attachment":[{"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=9034"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=9034"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=9034"},{"taxonomy":"yst_prominent_words","embeddable":true,"href":"https:\/\/www.better2know.co.uk\/blog\/wp-json\/wp\/v2\/yst_prominent_words?post=9034"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}