{"id":9057,"date":"2026-07-24T00:32:20","date_gmt":"2026-07-23T20:32:20","guid":{"rendered":"https:\/\/gastroclinic.am\/?page_id=9057"},"modified":"2026-07-28T23:03:42","modified_gmt":"2026-07-28T19:03:42","slug":"fib4","status":"publish","type":"page","link":"https:\/\/gastroclinic.am\/en\/fib4\/","title":{"rendered":"FIB-4 calculator"},"content":{"rendered":"\n\n\n<!-- INSERT into UX Builder -> HTML block -->\n\n<style>\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;500;600;700&display=swap');\n\n#fib4en, #fib4en * { box-sizing: border-box; margin: 0; padding: 0; }\n#fib4en {\n  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;\n  color: #1C1C1E;\n  max-width: 780px;\n  margin: 0 auto;\n  padding: 2rem 2rem 3rem;\n  -webkit-font-smoothing: antialiased;\n  background: rgba(119,174,92,0.07);\n  border-radius: 20px;\n}\n\n#fib4en .step-label {\n  font-size: 11px; font-weight: 600; letter-spacing: .1em;\n  text-transform: uppercase; 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}\n  to { opacity: 1; transform: translateY(0); }\n}\n<\/style>\n\n<div id=\"fib4en\">\n  <div class=\"step-label\">FIB-4 calculator<\/div>\n  <div class=\"step-title\">Quick assessment of liver fibrosis risk<\/div>\n  <p class=\"intro\">Enter the laboratory values using the correct units. The calculator will show the FIB-4 score, risk category, and the recommended next step.<\/p>\n\n  <div class=\"formula-card\">\n    <span class=\"formula-lbl\">Formula<\/span>\n    <span class=\"formula-main\">FIB-4 = (age \u00d7 AST) \/ (platelets \u00d7 \u221aALT)<\/span>\n  <\/div>\n\n  <div class=\"step-label\">Step 1<\/div>\n  <div class=\"step-title\">Enter your values<\/div>\n  <div class=\"fields-grid\">\n    <div class=\"field-wrap\">\n      <label for=\"fib4en-age\">Age (years)<\/label>\n      <input type=\"number\" id=\"fib4en-age\" placeholder=\"48\" min=\"18\" max=\"120\" step=\"1\">\n      <span class=\"field-hint\">The test has limited reliability under age 35<\/span>\n    <\/div>\n    <div class=\"field-wrap\">\n      <label for=\"fib4en-ast\">AST (U\/L)<\/label>\n      <input type=\"number\" id=\"fib4en-ast\" placeholder=\"32\" min=\"1\" step=\"0.1\">\n      <span class=\"field-hint\">Aspartate aminotransferase<\/span>\n    <\/div>\n    <div class=\"field-wrap\">\n      <label for=\"fib4en-alt\">ALT (U\/L)<\/label>\n      <input type=\"number\" id=\"fib4en-alt\" placeholder=\"40\" min=\"1\" step=\"0.1\">\n      <span class=\"field-hint\">Alanine aminotransferase<\/span>\n    <\/div>\n    <div class=\"field-wrap\">\n      <label for=\"fib4en-plt\">Platelets (\u00d710\u2079\/L)<\/label>\n      <input type=\"number\" id=\"fib4en-plt\" placeholder=\"210\" min=\"1\" step=\"0.1\">\n      <span class=\"field-hint\">Enter, for example, 200, not 200,000<\/span>\n    <\/div>\n  <\/div>\n\n  <button class=\"main-btn\" type=\"button\" onclick=\"fib4EnValidateAndCalc()\">Calculate FIB-4<\/button>\n  <button class=\"ghost-btn\" type=\"button\" onclick=\"fib4EnReset()\">Clear fields<\/button>\n\n  <div class=\"validation-msg\" id=\"fib4en-validation-msg\">\n    <ul id=\"fib4en-validation-list\"><\/ul>\n  <\/div>\n\n  <div id=\"fib4en-res\" style=\"display:none\"><\/div>\n<\/div>\n\n<script>\n(function(){\nfunction num(id){\n  var el=document.getElementById(id);\n  if(!el)return NaN;\n  return parseFloat(String(el.value).replace(',', '.'));\n}\nfunction clearErrors(){\n  document.querySelectorAll('#fib4en .field-error').forEach(function(el){el.classList.remove('field-error');});\n}\nfunction markError(id){\n  var el=document.getElementById(id);\n  if(el&&el.closest('.field-wrap'))el.closest('.field-wrap').classList.add('field-error');\n}\nfunction pillClass(kind){\n  if(kind==='low')return 'p-low';\n  if(kind==='high')return 'p-high';\n  if(kind==='warn')return 'p-warn';\n  return 'p-mid';\n}\nfunction showResult(data){\n  var cta='';\n  if(data.ctaText&&data.ctaUrl){\n    cta='<a class=\"cta-btn\" style=\"display:flex\" href=\"'+data.ctaUrl+'\">'+data.ctaText+'<\/a>';\n  }\n  var html='<div class=\"divider\"><\/div>'\n    +'<div class=\"res-title\">Your result<\/div>'\n    +'<div class=\"res-sub\">Interpretation depends on age: from 35 to 65 years, the low-risk cut-off is 1.30; after age 65, it is 2.00.<\/div>'\n    +'<div class=\"score-card\">'\n      +'<div class=\"score-top\">'\n        +'<div><div class=\"score-lbl\">FIB-4 score<\/div><div class=\"score-num\">'+data.score.toFixed(2)+'<\/div><\/div>'\n        +'<span class=\"risk-pill '+pillClass(data.kind)+'\">'+data.badge+'<\/span>'\n      +'<\/div>'\n      +'<div class=\"result-message\">'+data.message+'<\/div>'\n    +'<\/div>'\n    +'<div class=\"next-card\"><div class=\"next-title\">What to do next<\/div><div class=\"next-text\">'+data.next+'<\/div><\/div>'\n    +cta\n    +'<p class=\"footnote\">* This calculator is intended for orientation only and does not replace medical consultation. The result should be interpreted together with symptoms, risk factors, and other tests.<\/p>';\n  var r=document.getElementById('fib4en-res');\n  r.innerHTML=html;\n  r.style.display='block';\n  r.scrollIntoView({behavior:'smooth',block:'nearest'});\n}\nwindow.fib4EnValidateAndCalc=function(){\n  var errors=[];\n  clearErrors();\n  var age=num('fib4en-age'), ast=num('fib4en-ast'), alt=num('fib4en-alt'), plt=num('fib4en-plt');\n  if(!Number.isFinite(age)){errors.push('Enter age');markError('fib4en-age');}\n  else if(age<18||age>120){errors.push('Age must be between 18 and 120 years');markError('fib4en-age');}\n  if(!Number.isFinite(ast)){errors.push('Enter AST');markError('fib4en-ast');}\n  else if(ast<=0){errors.push('AST must be a positive number');markError('fib4en-ast');}\n  if(!Number.isFinite(alt)){errors.push('Enter ALT');markError('fib4en-alt');}\n  else if(alt<=0){errors.push('ALT must be a positive number');markError('fib4en-alt');}\n  if(!Number.isFinite(plt)){errors.push('Enter the platelet count');markError('fib4en-plt');}\n  else if(plt<=0){errors.push('Platelet count must be a positive number');markError('fib4en-plt');}\n\n  var msgBox=document.getElementById('fib4en-validation-msg');\n  var list=document.getElementById('fib4en-validation-list');\n  if(errors.length>0){\n    list.innerHTML=errors.map(function(e){return '<li>'+e+'<\/li>';}).join('');\n    msgBox.style.display='block';\n    msgBox.scrollIntoView({behavior:'smooth',block:'nearest'});\n    return;\n  }\n  msgBox.style.display='none';\n  list.innerHTML='';\n\n  var score=(age*ast)\/(plt*Math.sqrt(alt));\n  if(age<35){\n    showResult({\n      score:score,\n      kind:'warn',\n      badge:'Test is unreliable',\n      message:'In patients younger than 35, the FIB-4 score may not be reliable enough to rule out or confirm liver fibrosis.',\n      next:'Discuss the result with a gastroenterologist or hepatologist. If needed, the doctor may recommend additional tests.'\n    });\n    return;\n  }\n  if(score>=2.67){\n    showResult({\n      score:score,\n      kind:'high',\n      badge:'High risk',\n      message:'The result falls into the high-risk zone for advanced fibrosis. This may indicate a likelihood of F3\u2013F4 fibrosis.',\n      next:'Consult a hepatologist or gastroenterologist to confirm the result, plan further diagnostics, and decide on next steps.',\n      ctaText:'Book a hepatologist visit',\n      ctaUrl:'https:\/\/gastroclinic.am\/en\/ourstaff\/meri-soghoyan\/'\n    });\n    return;\n  }\n  var lowCutoff=age>65?2.0:1.3;\n  if(score<lowCutoff){\n    showResult({\n      score:score,\n      kind:'low',\n      badge:'Low risk',\n      message:'The result falls into the low-risk zone for advanced liver fibrosis.',\n      next:'Unless your doctor recommends otherwise, continue preventive monitoring and repeat the assessment in about one year.'\n    });\n    return;\n  }\n  showResult({\n    score:score,\n    kind:'mid',\n    badge:'Indeterminate zone',\n    message:'The result is in the indeterminate zone, where the FIB-4 score alone is not enough for a final assessment.',\n    next:'Additional evaluation is recommended, such as liver elastography.',\n    ctaText:'Book liver elastography',\n    ctaUrl:'https:\/\/gastroclinic.am\/en\/elastography\/'\n  });\n};\nwindow.fib4EnReset=function(){\n  ['fib4en-age','fib4en-ast','fib4en-alt','fib4en-plt'].forEach(function(id){\n    var el=document.getElementById(id);\n    if(el)el.value='';\n  });\n  clearErrors();\n  document.getElementById('fib4en-validation-msg').style.display='none';\n  document.getElementById('fib4en-validation-list').innerHTML='';\n  document.getElementById('fib4en-res').style.display='none';\n  document.getElementById('fib4en-res').innerHTML='';\n  window.scrollTo({top:document.getElementById('fib4en').offsetTop-20,behavior:'smooth'});\n};\n})();\n<\/script>\n\n\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":9162,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-9057","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - 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