{"id":66643,"date":"2026-10-12T08:29:59","date_gmt":"2026-10-12T05:29:59","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66643"},"modified":"2026-10-12T08:29:59","modified_gmt":"2026-10-12T05:29:59","slug":"wells-score-for-dvt-calculator","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/medical\/wells-score-for-dvt-calculator\/","title":{"rendered":"Wells Score for DVT Calculator"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Estimate the Pretest Probability of Deep Vein Thrombosis<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66643\" data-favorite-title=\"Wells Score for DVT\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/medical\/wells-score-for-dvt-calculator\/\" data-favorite-excerpt=\"Estimate the pretest probability of deep vein thrombosis (DVT) with the Wells score. Tick the clinical findings that apply and get an instant low, moderate or high risk category.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-flask\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/en\/medical\/wells-score-for-dvt-calculator\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66643\" data-post=\"66643\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"is-single field\" id=\"input-1\"><span class=\"font-semibold\">Clinical signs and symptoms<\/span><\/div><div class=\"field is-checkbox is-single\" id=\"input-2\"><input type=\"checkbox\" id=\"field-2\" value=\"1\" checked=\"checked\"\/><label for=\"field-2\">Localized tenderness along the deep venous system<\/label><\/div><div class=\"field is-checkbox is-single\" id=\"input-3\"><input type=\"checkbox\" id=\"field-3\" value=\"1\" checked=\"checked\"\/><label for=\"field-3\">Entire leg swollen<\/label><\/div><div class=\"field is-checkbox is-single\" id=\"input-4\"><input type=\"checkbox\" id=\"field-4\" value=\"1\"\/><label for=\"field-4\">Calf swelling at least 3 cm larger than the other leg<\/label><\/div><div class=\"field is-checkbox is-single\" id=\"input-5\"><input type=\"checkbox\" id=\"field-5\" value=\"1\"\/><label for=\"field-5\">Pitting edema confined to the symptomatic leg<\/label><\/div><div class=\"field is-checkbox is-single\" id=\"input-6\"><input type=\"checkbox\" id=\"field-6\" value=\"1\"\/><label for=\"field-6\">Collateral (non-varicose) superficial veins<\/label><\/div><div class=\"is-single field\" id=\"input-7\"><span class=\"font-semibold\">Risk factors and history<\/span><\/div><div class=\"field is-checkbox is-single\" id=\"input-8\"><input type=\"checkbox\" id=\"field-8\" value=\"1\"\/><label for=\"field-8\">Active cancer<\/label><\/div><div class=\"field is-checkbox is-single\" id=\"input-9\"><input type=\"checkbox\" id=\"field-9\" value=\"1\"\/><label for=\"field-9\">Paralysis, paresis or recent leg cast<\/label><\/div><div class=\"field is-checkbox is-single\" id=\"input-10\"><input type=\"checkbox\" id=\"field-10\" value=\"1\"\/><label for=\"field-10\">Bedridden 3+ days or major surgery within 12 weeks<\/label><\/div><div class=\"field is-checkbox is-single\" id=\"input-11\"><input type=\"checkbox\" id=\"field-11\" value=\"1\"\/><label for=\"field-11\">Previously documented DVT<\/label><\/div><div class=\"is-single field\" id=\"input-12\"><span class=\"font-semibold\">Differential diagnosis<\/span><\/div><div class=\"field is-checkbox is-single\" id=\"input-13\"><input type=\"checkbox\" id=\"field-13\" value=\"-2\"\/><label for=\"field-13\">An alternative diagnosis is at least as likely<\/label><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66643\">Calculate<\/button><button type=\"reset\">Reset<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculate automatically<\/label><small>If enabled, the result will update automatically when you change any value.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Your Wells DVT Result<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Wells DVT score<\/span><span class=\"result-term\">score<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Pretest probability category<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-3\"><span class=\"field-title\"><span>What this means<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copy link to this calculation<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Leave a Comment<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"66643\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Like <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Helpful <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confused <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Disappointed <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inaccurate <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>Wells Score for DVT Formula<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\\[ S \\;=\\; \\sum_{i=1}^{9} c_i \\;-\\; 2 \\cdot D \\\\[6pt] c_i = \\begin{cases} 1 &amp; \\text{if criterion } i \\text{ is present} \\\\ 0 &amp; \\text{if criterion } i \\text{ is absent} \\end{cases} \\qquad D = \\begin{cases} 1 &amp; \\text{if an alternative diagnosis is at least as likely} \\\\ 0 &amp; \\text{otherwise} \\end{cases} \\]<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(S\\) \u2014 total Wells DVT score<\/li>\n<li>\\(c_i\\) \u2014 each of the nine clinical findings (tenderness along the deep venous system, entire leg swollen, calf swelling \u2265 3 cm, pitting edema, collateral superficial veins, active cancer, paralysis or recent leg cast, bedridden \u2265 3 days or major surgery within 12 weeks, previously documented DVT)<\/li>\n<li>\\(D\\) \u2014 subtracts 2 points when an alternative diagnosis explains the symptoms at least as well as DVT<\/li>\n<\/ul>\n<p>The score converts clinical findings into a pretest probability category: \\(S \\le 0\\) is low, \\(1 \\le S \\le 2\\) is moderate, and \\(S \\ge 3\\) is high probability of DVT.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-459\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Wells Score for DVT \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<p>{example}<\/p>\n<p><strong>Example:<\/strong> a 62-year-old patient presents with a painful, swollen right leg. On examination there is localized tenderness along the deep venous system and the entire leg is visibly swollen; no other criteria apply and no alternative diagnosis is considered more likely.<\/p>\n<p>\\[ S = \\underbrace{1}_{\\text{tenderness}} + \\underbrace{1}_{\\text{whole leg swollen}} = 2 \\]<\/p>\n<p><strong>Result:<\/strong> Wells DVT score = <strong>2<\/strong> \u2014 <strong>modate<\/strong> pretest probability (DVT prevalence of about 17% in this category). A D-dimer test or compression ultrasound is typically recommended. Under the simplified two-level rule (score \u2265 2), DVT is considered <em>likely<\/em> and imaging is the next step.<\/p>\n<p>{\/example}<\/p>\n\r\n<\/section>\n<h2>How to use the calculator<\/h2>\n<ol>\n<li>Review the patient's symptoms and history, then tick each item under <strong>Clinical signs and symptoms<\/strong> that is present: localized tenderness along the deep venous system, entire leg swollen, calf swelling at least 3 cm larger than the other leg (measured 10 cm below the tibial tuberosity), pitting edema confined to the symptomatic leg, or collateral non-varicose superficial veins.<\/li>\n<li>Tick any applicable items under <strong>Risk factors and history<\/strong>: active cancer (treatment within 6 months or palliative care), paralysis, paresis or a recent leg cast, bedridden 3 or more days or major surgery within 12 weeks, or a previously documented DVT.<\/li>\n<li>Under <strong>Differential diagnosis<\/strong>, tick <em>An alternative diagnosis is at least as likely<\/em> only if another condition (for example cellulitis, a muscle tear or heart failure) explains the leg symptoms at least as well as DVT. This subtracts 2 points.<\/li>\n<li>Read your <strong>Wells DVT Result<\/strong>: the total score, the pretest probability category (low \u2264 0, moderate 1\u20132, high \u2265 3), the approximate DVT prevalence for that category, and the suggested next diagnostic step.<\/li>\n<\/ol>\n<h2>What is the Wells score for DVT?<\/h2>\n<p>Deep vein thrombosis is a blood clot in a deep vein, most often in the leg. It affects roughly 1 in 1,000 people per year and can lead to pulmonary embolism if part of the clot breaks loose, so recognizing it quickly matters. The difficulty is that symptoms such as swelling, pain and redness are shared with many far more common conditions, and imaging every patient with a sore leg is neither practical nor necessary.<\/p>\n<p>The Wells score, developed by Philip Stevens Wells and colleagues, solves this problem by structuring clinical judgment into a simple point count. Nine findings each add 1 point, while a plausible alternative diagnosis subtracts 2 points. The total places the patient into a low, moderate or high pretest probability group. In the original validation studies, DVT was present in about 5% of low-probability patients, 17% of moderate-probability patients and 53% of high-probability patients.<\/p>\n<p>The key word is <em>pretest<\/em>: the score tells you how likely DVT is <em>before<\/em> any testing, which determines what test should come next. In the low-probability group, guidelines generally allow DVT to be excluded with a negative D-dimer test without ultrasound. In the moderate group, either a D-dimer or a compression ultrasound is appropriate. In the high-probability group, guidelines recommend proceeding directly to compression ultrasonography, because a negative D-dimer alone is not considered sufficient to rule out the diagnosis.<\/p>\n<p>Many modern algorithms also use a simplified two-level version of the rule: a score of 2 or more classifies DVT as <em>likely<\/em> (proceed to imaging), while a score below 2 classifies it as <em>unlikely<\/em> (D-dimer can safely rule out). The calculator shows both interpretations in the result so you can follow whichever pathway your local protocol uses.<\/p>\n<h2>Assumptions, limitations and practical tips<\/h2>\n<ul>\n<li><strong>Clinical tool, not a diagnosis.<\/strong> The Wells score estimates probability only. It cannot confirm or exclude DVT on its own \u2014 a definitive answer requires D-dimer testing, compression ultrasonography, or both.<\/li>\n<li><strong>Designed for symptomatic patients.<\/strong> The score was validated in patients with signs or symptoms suggestive of DVT in a leg. It is not a screening tool for asymptomatic people.<\/li>\n<li><strong>Measure the calf properly.<\/strong> The 3 cm calf-swelling criterion refers to a difference measured 10 cm below the tibial tuberosity (the bony bump below the kneecap), not at the ankle or the widest part of the calf.<\/li>\n<li><strong>Collateral veins must be non-varicose.<\/strong> Only newly visible superficial veins that are not varicose veins count; longstanding varicose veins do not.<\/li>\n<li><strong>Use judgment on the alternative diagnosis item.<\/strong> This is the most subjective part of the score. It should only be ticked when another diagnosis genuinely explains the symptoms at least as well as DVT \u2014 not simply because another condition is possible.<\/li>\n<li><strong>When in doubt, test.<\/strong> A low score reduces but does not eliminate risk. If clinical suspicion persists despite a low score, objective testing is still warranted. Sudden leg swelling, pain or redness always deserves prompt medical evaluation.<\/li>\n<\/ul>\n<p>For related clinical scoring tools, you may also find the <a href=\"https:\/\/wpcalc.com\/en\/medical\/cha2ds2-vasc-score\/\">CHA\u2082DS\u2082-VASc Score<\/a>, the <a href=\"https:\/\/wpcalc.com\/en\/medical\/glasgow-coma-scale-calculator\/\">Glasgow Coma Scale<\/a> and the <a href=\"https:\/\/wpcalc.com\/en\/medical\/framingham-risk-score\/\">Framingham Heart Disease Risk<\/a> calculators useful.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Estimate the pretest probability of deep vein thrombosis (DVT) with the Wells score. Tick the clinical findings that apply and get an instant low, moderate or high risk category.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[8],"tags":[50],"class_list":["post-66643","post","type-post","status-publish","format-standard","hentry","category-medical","tag-diagnostics"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66643","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=66643"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66643\/revisions"}],"predecessor-version":[{"id":66644,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66643\/revisions\/66644"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66643"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66643"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66643"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}