[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-403038-105":59,"doc-detail-403038-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","glucose-hydrogen-methane-breath-testing-patient-information","Glucose Hydrogen / Methane Breath Testing - Patient Information","","Glucose hydrogen/methane breath testing helps diagnose intestinal bacterial overgrowth by measuring hydrogen and/or methane levels in exhaled breath after ingesting glucose. Preparation requires diet and medication changes to ensure accurate results, including avoiding antibiotics and probiotics weeks before, stopping medications that affect gut movement one week before, and following a low-fibre, low-dairy meal plan the day before. On the test day, patients fast for 12 hours, avoid smoking, and follow breathing instructions over about 2.5 hours.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/glucose-hydrogen-methane-breath-testing-patient-information/403038/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/glucose-hydrogen-methane-breath-testing-patient-information/403038.png","ImageObject",300,407,{"name":92,"@type":93},"Theodore","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-05","2026-09-27",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",11,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What is a glucose hydrogen/methane breath test used to diagnose?","Question",{"text":113,"@type":114},"It is used to diagnose the syndrome of intestinal bacterial overgrowth by measuring hydrogen and/or methane levels in exhaled breath after glucose ingestion.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How should I prepare for the breath test?",{"text":118,"@type":114},"You must change your diet and omit some medication to keep measurements accurate. Follow the listed timelines: avoid antibiotics and probiotics four weeks before, stop gut-movement influencing medicines one week before, follow the specified low-fibre/low-dairy foods the day before, and fast for 12 hours on the test day.",{"name":120,"@type":111,"acceptedAnswer":121},"What happens during the breath test and how long will it take?",{"text":122,"@type":114},"You will blow into a bag for a baseline measurement, drink a small amount of glucose, and then blow into a bag at specific times until the test is completed. Allow about 2.5 hours at the hospital.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},403038,1790714185,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":39,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":46,"preview_page_count":4},7971461740886,"https://ap-avatar.wpscdn.com/davatar_3d24733baf745e90a7e4bdd5f77d97b2","Glucose Hydrogen / Methane Breath Testing  \nEndoscopy Suite  \nPatient Information  \nWhat is a breath test?  \nA glucose hydrogen/methane breath test is used to diagnose the syndrome of intestinal bacterial overgrowth.  \nWhy am I having a breath test?  \nIf the anatomy or physiology of your digestive tract have been changed by surgery, chemotherapy, radiotherapy or other conditions, you may have symptoms such as watery loose stool, a need to rush to the lavatory, wind, bloating and weight loss. If the levels of hydrogen and/or methane in the exhaled breath are high after the ingestion of glucose, this may indicate  \nbacterial overgrowth. We will measure these gases in your breath.  \nWhat preparation will I need for my breath test?  \nWe will ask you to change your diet and to omit some medication so that any breath test measurements recorded are accurate. It is important that you follow the instructions below very carefully. If these are not followed, your procedure may have to be cancelled.  \nFour weeks before:  \n• Do not take any antibiotics. If you take any antibiotics long-term, discuss this with the referring clinician  \n• Do not take any probiotics  \n• Any procedure requiring cleansing the bowel (such as colonoscopy) should not be done.  \nOne week before:  \n• Stop taking any medication which influences gut movement: laxatives, fibre supplements and prokinetics (medication increasing movements of the bowels).  \n• Stop taking Loperamide (Imodium) 48 hours before the test, if possible. Please discuss with your referring clinician if you are not sure.  \nOne day before:  \n• Avoid any high fibre foods, wholemeal products and dairy products.  \n• Food / drinks which you can have: white bread, white rice, potatoes, eggs, meat, fish, water, black coffee and tea.  \n• Food / drinks which you cannot have: pasta, vegetables, fruit, fruit juices, fizzy drinks, dairy products, pulses (lentils etc), nuts and seeds, sweets and chocolate.  \nOn the day of the test:  \n• Stop eating 12 hours before the test. Water is allowed. Do not eat anything during the test.  \n• Clean your teeth, but avoid mouthwash if it contains sugar or alcohol  \n• Do not smoke in the morning before the test and during the test.  \n• Avoid exercising or sleeping during the test.  \n• Have your usual medication (including blood pressure tablets) in the morning. If you have insulin-dependent diabetes, do not administer insulin in the morning, but bring the medication with you so that insulin can be administered immediately after the test, together with the food.  \nWhat will happen when I come up for the breath test?  \n• We will ask you to blow (exhale) into a bag for a baseline measurement  \n• We will give you a small amount of sweet liquid (glucose) to drink  \n• We will ask you to blow (exhale) into a bag at specific times until the test is completed  \n• Please write down any bowel symptoms you experience during the test  \n• Please allow 2.5 hours to be at the hospital.  \nWhen will I know the results?  \nThe results will either be assessed on the day or during the subsequent appointment in the clinic by the referring doctor. They will be sent to your GP and the consultant who referred you for the test. A follow up appointment will be arranged if it is needed.  \nContact details  \nFor routine advice, please contact  \nThe Endoscopy Suite 020 7811 8328 / 020 7811 8320  \n(Monday to Friday, 8am – 5pm)  \nIf we cannot take your call, please leave an answerphone message. These will be collected twice daily (Monday to Friday) and a member of the Endoscopy Suite will return your call. Outside of working hours 020 7352 8171  \nPlease call the main switchboard and ask to speak to the clinical site practitioner.  \nAlternatively, please call:  \nThe Royal Marsden Macmillan Hotline: 020 8915 6899 (available 24 hours a day, 7 days a week)  \nCall us straight away if you are feeling unwell or are worried about the side effects of cancer treatments.  \nThis service provides specialist advice and sup","cbCaigXUt4gmzQ7x","https://ap.wps.com/l/cbCaigXUt4gmzQ7x","pdf",207252,"English","# Patient Information\n## What is a breath test?\n## Why am I having a breath test?\n## What preparation will I need for my breath test?\n## Four weeks before\n## One week before\n## One day before\n## On the day of the test\n## What will happen when I come up for the breath test?\n## When will I know the results?\n## Contact details\n## References","[{\"question\":\"What is a glucose hydrogen/methane breath test used to diagnose?\",\"answer\":\"It is used to diagnose the syndrome of intestinal bacterial overgrowth by measuring hydrogen and/or methane levels in exhaled breath after glucose ingestion.\"},{\"question\":\"How should I prepare for the breath test?\",\"answer\":\"You must change your diet and omit some medication to keep measurements accurate. Follow the listed timelines: avoid antibiotics and probiotics four weeks before, stop gut-movement influencing medicines one week before, follow the specified low-fibre/low-dairy foods the day before, and fast for 12 hours on the test day.\"},{\"question\":\"What happens during the breath test and how long will it take?\",\"answer\":\"You will blow into a bag for a baseline measurement, drink a small amount of glucose, and then blow into a bag at specific times until the test is completed. Allow about 2.5 hours at the hospital.\"}]","Glucose Hydrogen / Methane Breath Testing - Patient Information | PDF",1790536768]