{"id":435,"date":"2025-08-15T08:08:12","date_gmt":"2025-08-15T08:08:12","guid":{"rendered":"https:\/\/www.yorktest.com\/us\/?page_id=435"},"modified":"2025-10-11T10:56:54","modified_gmt":"2025-10-11T10:56:54","slug":"what-do-they-test","status":"publish","type":"page","link":"https:\/\/www.yorktest.com\/us\/buyers-guide\/what-do-they-test\/","title":{"rendered":"What do they test"},"content":{"rendered":"\n\n\n<section class=\"pt-6 pb-6 lg:pt-8 lg:pb-8 \" id=\"\" data-section=\"breadcrumbs\">\n    <div class=\"container\">\n        <div class=\"flex\">\n            <nav aria-label=\"breadcrumbs\" class=\"rank-math-breadcrumb\"><p><span class=\"last\">Home<\/span><\/p><\/nav>\n        <\/div>\n    <\/div>\n<\/section>\n\n\n\n\n<section class=\"pt-0 pb-10 lg:pt-0 lg:pb-10 \" id=\"\" data-block=\"heading-and-text\">\n    <div class=\"container\">\n        <div class=\"flex flex-col gap-6\">\n                            <h1 class=\"text-5xl lg:text-[70px] leading-[1.2]\">\n                    What Do They Actually Test For? \u2026.Hint: We Don\u2019t Mean Ingredients!\n                <\/h1>\n            \n                            <div class=\"wysiwyg\">\n                    <p>Not all IgG blood tests are the same and, sometimes, it can be extremely difficult to work out who tests for what. Now this is where it gets science-y but you don\u2019t need to be a scientific whizz to understand all about IgG and how it plays an important part in a test\u2019s credibility.<\/p>\n<p>A reliable method for food intolerance testing is through IgG analysis, which is a fancy name for testing the reactions to the proteins in foods. IgG stands for Immunoglobulin G.<\/p>\n<p>There are four subtypes of IgG. In normal human blood, IgG1 is the most prevalent, making up around 60-70% of your total IgG, followed by IgG2 (20-30%), IgG3 (5-8%). IgG4 only makes up 1-4% of the IgG antibodies present.<\/p>\n<p>IgG1, 2 and 3 are\u00a0<strong><u>all<\/u><\/strong>\u00a0capable of causing inflammation which could contribute to\u00a0<a href=\"https:\/\/www.yorktest.com\/food-intolerance-advice\/symptoms\/\">Food Intolerance Symptoms<\/a>. IgG4 antibodies, however, are only present in low levels and its presence is not as relevant to inflammatory reactions.<\/p>\n<p>What does this mean for you? The truth is \u2013 a lot more than you think. The value of choosing a testing provider which only tests IgG4 and using those results for your elimination diet is actually very limited and there\u2019s little evidence that this is helpful.<\/p>\n<p>There are a few food intolerance providers out there which only test for IgG4. Check them out below:<\/p>\n\n                <\/div>\n                    <\/div>\n    <\/div>\n<\/section>\n\n\n\n\n<section class=\"bg- pt-10 pb-10 lg:pt-20 lg:pb-20 \" id=\"\" data-block=\"generic-content\">\n    <div class=\"container\">\n        <div class=\"w-full \">\n                            <div class=\"wysiwyg\">\n                    <p><img loading=\"lazy\" decoding=\"async\" class=\" ls-is-cached lazyloaded\" style=\"max-width: 550px;\" src=\"https:\/\/www.yorktest.com\/wp-content\/uploads\/2019\/01\/graphs2-1024x742.jpg\" alt=\"\" width=\"500\" height=\"362\" data-src=\"https:\/\/www.yorktest.com\/wp-content\/uploads\/2019\/01\/graphs2-1024x742.jpg\" \/><\/p>\n<p>(Accurate as of October 2018)<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\" lazyloaded\" style=\"max-width: 200px;\" src=\"https:\/\/www.yorktest.com\/wp-content\/uploads\/sites\/4\/2018\/08\/food-for-touht.png\" alt=\"food for thought\" data-src=\"https:\/\/www.yorktest.com\/wp-content\/uploads\/sites\/4\/2018\/08\/food-for-touht.png\" \/><\/p>\n<h3 class=\"block-title\" style=\"color: #00b8aa;\">Food For Thought: Would You Pay For A Whole Pizza When You\u2019re Only Able To Have A Slice?<\/h3>\n<p>The answer is: we hope not! It\u2019s important you get the most bang for your buck, and a food sensitivity test which only tests 1-4% of your IgG profile is not a useful food intolerance test. It\u2019s like paying to view a famous painting in a gallery. Would you pay to see the corner of a painting?<\/p>\n<p>If you\u2019re going to buy a test, make sure you don\u2019t get left in the cold by only seeing the tip of the iceberg.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\" lazyloaded\" style=\"max-width: 880px;\" src=\"https:\/\/www.yorktest.com\/wp-content\/uploads\/sites\/4\/2018\/08\/tip-of-the-iceberg-883x1024.png\" alt=\"tip of the iceberg\" data-src=\"https:\/\/www.yorktest.com\/wp-content\/uploads\/sites\/4\/2018\/08\/tip-of-the-iceberg-883x1024.png\" \/><\/p>\n\n                <\/div>\n            \n                    <\/div>\n    <\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":332,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-435","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.yorktest.com\/us\/wp-json\/wp\/v2\/pages\/435","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yorktest.com\/us\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.yorktest.com\/us\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.yorktest.com\/us\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yorktest.com\/us\/wp-json\/wp\/v2\/comments?post=435"}],"version-history":[{"count":3,"href":"https:\/\/www.yorktest.com\/us\/wp-json\/wp\/v2\/pages\/435\/revisions"}],"predecessor-version":[{"id":86413,"href":"https:\/\/www.yorktest.com\/us\/wp-json\/wp\/v2\/pages\/435\/revisions\/86413"}],"up":[{"embeddable":true,"href":"https:\/\/www.yorktest.com\/us\/wp-json\/wp\/v2\/pages\/332"}],"wp:attachment":[{"href":"https:\/\/www.yorktest.com\/us\/wp-json\/wp\/v2\/media?parent=435"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}