{"id":8575,"date":"2025-01-31T10:16:42","date_gmt":"2025-01-31T08:16:42","guid":{"rendered":"https:\/\/medilab.km.ua\/?p=8575"},"modified":"2026-06-01T19:36:46","modified_gmt":"2026-06-01T16:36:46","slug":"what-is-the-basic-rules-of-preparation-before-analyzing","status":"publish","type":"post","link":"https:\/\/medilab.km.ua\/en\/what-is-the-basic-rules-of-preparation-before-analyzing\/","title":{"rendered":"What not to eat before tests: basic preparation rules"},"content":{"rendered":"<h2 data-start=\"70\" data-end=\"127\"><strong data-start=\"73\" data-end=\"125\">Why proper preparation for tests is important<\/strong><\/h2>\n<p data-start=\"129\" data-end=\"567\">Imagine the situation: you are preparing for an important medical examination, come to the laboratory, take tests, but a day later you get disappointing results. Increased glucose levels, lack of important trace elements, abnormalities in liver function... This can cause panic, but there is a nuance - yesterday you drank a cup of coffee, ate a banana or had something fatty for dinner. Such seemingly insignificant little things can significantly affect the test results.<\/p>\n<p data-start=\"569\" data-end=\"834\">Proper preparation for tests is the key to an accurate diagnosis and correct treatment. Some foods can increase blood glucose levels, affect hormone balance, or change the composition of urine, so it is important to know which foods to avoid before testing.<\/p>\n<h2 data-start=\"836\" data-end=\"883\"><strong data-start=\"839\" data-end=\"881\">Basic <a href=\"https:\/\/medilab.km.ua\/en\/rules-for-preparing-for-analysis-that-you-need-to-know-to-get-accurate-results\/\">rules for preparing for tests<\/a><\/strong><\/h2>\n<p data-start=\"885\" data-end=\"969\">Before taking laboratory tests, you should follow these general recommendations:<\/p>\n<ul data-start=\"970\" data-end=\"1522\">\n<li data-start=\"970\" data-end=\"1078\"><strong data-start=\"972\" data-end=\"1018\">Blood tests are usually done on an empty stomach.<\/strong> \u2013 the last meal should be at least 8-12 hours ago.<\/li>\n<li data-start=\"1079\" data-end=\"1186\"><strong data-start=\"1081\" data-end=\"1128\">Do not drink alcohol 24-48 hours before the test<\/strong> \u2013 it affects liver function and glucose levels.<\/li>\n<li data-start=\"1187\" data-end=\"1288\"><strong data-start=\"1189\" data-end=\"1238\">Do not drink coffee, tea, or juices in the morning before the test.<\/strong> \u2013 they can change sugar and hormone levels.<\/li>\n<li data-start=\"1289\" data-end=\"1401\"><strong data-start=\"1291\" data-end=\"1345\">Avoid fatty and spicy foods on the eve of tests<\/strong> \u2013 it affects the level of lipids and enzymes in the blood.<\/li>\n<li data-start=\"1402\" data-end=\"1522\"><strong data-start=\"1404\" data-end=\"1455\">Reduce physical activity before testing<\/strong> \u2013 activity can increase levels of certain enzymes and hormones.<\/li>\n<\/ul>\n<h2 data-start=\"1524\" data-end=\"1571\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-8577\" src=\"https:\/\/medilab.km.ua\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/front-view-young-female-doctor-white-medical-suit-with-blue-stethoscope-holding-injection-flask-pink-space-medicine-medical-hospital-health.jpg\" alt=\" Products that affect test results\" width=\"1200\" height=\"800\" srcset=\"\" data-srcset=\"https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/front-view-young-female-doctor-white-medical-suit-with-blue-stethoscope-holding-injection-flask-pink-space-medicine-medical-hospital-health.jpg 1200w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/front-view-young-female-doctor-white-medical-suit-with-blue-stethoscope-holding-injection-flask-pink-space-medicine-medical-hospital-health-150x100.jpg 150w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/front-view-young-female-doctor-white-medical-suit-with-blue-stethoscope-holding-injection-flask-pink-space-medicine-medical-hospital-health-600x400.jpg 600w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/front-view-young-female-doctor-white-medical-suit-with-blue-stethoscope-holding-injection-flask-pink-space-medicine-medical-hospital-health-300x200.jpg 300w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/front-view-young-female-doctor-white-medical-suit-with-blue-stethoscope-holding-injection-flask-pink-space-medicine-medical-hospital-health-1024x683.jpg 1024w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/front-view-young-female-doctor-white-medical-suit-with-blue-stethoscope-holding-injection-flask-pink-space-medicine-medical-hospital-health-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/h2>\n<h2 data-start=\"1524\" data-end=\"1571\"><strong data-start=\"1527\" data-end=\"1569\">What not to eat before blood tests<\/strong><\/h2>\n<p data-start=\"1573\" data-end=\"1656\">The food you eat before testing can significantly change the test results.<\/p>\n<h3 data-start=\"1658\" data-end=\"1699\"><strong data-start=\"1662\" data-end=\"1697\">1. Complete blood count (CBC)<\/strong><\/h3>\n<p data-start=\"1700\" data-end=\"1816\"><a href=\"https:\/\/medilab.km.ua\/en\/analysis\/hematological-panel\/zagalnyj-rozgornutyj-analiz-krovi-avtomatychnyj-analyzer-wbc-lym-mid-grn-lym-mid-grn-rbc-hb-hct-mcv-mch-mchc-rdw-plt-pct-mpv-pdw-3-histogramy-wbc-rbc-plt-shoe-ruchnyj-pidrahunok-lejkotsytarnoyi-fo\/\">Complete blood count<\/a> is performed to assess hemoglobin levels, leukocyte, erythrocyte, and platelet counts.<\/p>\n<p data-start=\"1818\" data-end=\"1838\"><strong data-start=\"1818\" data-end=\"1836\">You can&#039;t eat:<\/strong><\/p>\n<ul data-start=\"1839\" data-end=\"1954\">\n<li data-start=\"1839\" data-end=\"1863\">fatty and fried foods<\/li>\n<li data-start=\"1864\" data-end=\"1896\">sweets and flour products<\/li>\n<li data-start=\"1897\" data-end=\"1925\">meat and sausage products<\/li>\n<li data-start=\"1926\" data-end=\"1954\">strong tea, coffee and juices<\/li>\n<\/ul>\n<p data-start=\"1956\" data-end=\"2025\"><strong data-start=\"1956\" data-end=\"2023\">You can eat (3-4 hours before the test, if the test is not done on an empty stomach):<\/strong><\/p>\n<ul data-start=\"2026\" data-end=\"2145\">\n<li data-start=\"2026\" data-end=\"2050\">light porridge without butter<\/li>\n<li data-start=\"2051\" data-end=\"2117\">vegetables (except beets and carrots, which can change the color of plasma)<\/li>\n<li data-start=\"2118\" data-end=\"2145\">unsweetened tea or water<\/li>\n<\/ul>\n<h3 data-start=\"2147\" data-end=\"2184\"><strong data-start=\"2151\" data-end=\"2182\">2. Biochemical blood test<\/strong><\/h3>\n<p data-start=\"2185\" data-end=\"2316\"><a href=\"https:\/\/medilab.km.ua\/en\/price\/?3325_product_cat%5B0%5D=68&amp;3325_device=laptop&amp;3325_filtered=true\">Biochemistry<\/a> allows you to assess the functioning of the liver, kidneys, pancreas, and determine the level of glucose, cholesterol, proteins, and enzymes.<\/p>\n<p data-start=\"2318\" data-end=\"2361\"><strong data-start=\"2318\" data-end=\"2359\">You should not eat 12 hours before the analysis:<\/strong><\/p>\n<ul data-start=\"2362\" data-end=\"2452\">\n<li data-start=\"2362\" data-end=\"2386\">fatty and fried foods<\/li>\n<li data-start=\"2387\" data-end=\"2407\">dairy products<\/li>\n<li data-start=\"2408\" data-end=\"2416\">eggs<\/li>\n<li data-start=\"2417\" data-end=\"2427\">nuts<\/li>\n<li data-start=\"2428\" data-end=\"2440\">alcohol<\/li>\n<li data-start=\"2441\" data-end=\"2452\">fast food<\/li>\n<\/ul>\n<p data-start=\"2454\" data-end=\"2534\">It is also not recommended to drink large amounts of fluids, other than plain water.<\/p>\n<h3 data-start=\"2536\" data-end=\"2573\"><strong data-start=\"2540\" data-end=\"2571\">3. Glucose level analysis<\/strong><\/h3>\n<p data-start=\"2574\" data-end=\"2662\"><a href=\"https:\/\/medilab.km.ua\/en\/impact-of-covid-19-on-riven-glyukozy\/\">Blood glucose<\/a> can change under the influence of food, so before testing you should avoid:<\/p>\n<ul data-start=\"2663\" data-end=\"2796\">\n<li data-start=\"2663\" data-end=\"2690\">sweets, chocolate, honey<\/li>\n<li data-start=\"2691\" data-end=\"2732\">fruits (especially grapes, bananas)<\/li>\n<li data-start=\"2733\" data-end=\"2762\">juices and carbonated drinks<\/li>\n<li data-start=\"2763\" data-end=\"2796\">pastries and pasta<\/li>\n<\/ul>\n<p data-start=\"2798\" data-end=\"2898\">You should not chew gum before taking a glucose test, as it also contains sugar.<\/p>\n<h3 data-start=\"2900\" data-end=\"2932\"><strong data-start=\"2904\" data-end=\"2930\">4. Hormonal tests<\/strong><\/h3>\n<p data-start=\"2933\" data-end=\"3068\">Hormone tests require special preparation. For example, before testing for cortisol or adrenaline levels, you should avoid:<\/p>\n<ul data-start=\"3069\" data-end=\"3147\">\n<li data-start=\"3069\" data-end=\"3092\">coffee and strong tea<\/li>\n<li data-start=\"3093\" data-end=\"3105\">chocolate<\/li>\n<li data-start=\"3106\" data-end=\"3118\">alcohol<\/li>\n<li data-start=\"3119\" data-end=\"3147\">spicy and salty dishes<\/li>\n<\/ul>\n<p data-start=\"3149\" data-end=\"3323\">Some hormone tests (e.g., testosterone, estrogen, TSH) are preferably taken on certain days of the menstrual cycle, so you should check with your doctor before testing.<\/p>\n<h2 data-start=\"3325\" data-end=\"3371\"><strong data-start=\"3328\" data-end=\"3369\">What not to eat before a urine test<\/strong><\/h2>\n<p data-start=\"3373\" data-end=\"3487\">A urinalysis is an important test for diagnosing kidney function, the urinary system, and the overall condition of the body.<\/p>\n<p data-start=\"3489\" data-end=\"3547\"><strong data-start=\"3489\" data-end=\"3545\">Before taking a urine test, it is not recommended to consume:<\/strong><\/p>\n<ul data-start=\"3548\" data-end=\"3721\">\n<li data-start=\"3548\" data-end=\"3600\">beets and carrots \u2013 they can change the color of your urine<\/li>\n<li data-start=\"3601\" data-end=\"3641\">salted, smoked, pickled products<\/li>\n<li data-start=\"3642\" data-end=\"3654\">alcohol<\/li>\n<li data-start=\"3655\" data-end=\"3692\">vitamins and vitamin C supplements<\/li>\n<li data-start=\"3693\" data-end=\"3721\">coffee and caffeinated drinks<\/li>\n<\/ul>\n<p data-start=\"3723\" data-end=\"3833\">You should also avoid excessive fluid intake to avoid diluting your urine, which can distort the test results.<\/p>\n<h2 data-start=\"3835\" data-end=\"3881\"><strong data-start=\"3838\" data-end=\"3879\">What not to eat before a stool test<\/strong><\/h2>\n<p data-start=\"3883\" data-end=\"3998\">Some products can alter the results of a stool test, especially when it comes to tests for occult blood.<\/p>\n<p data-start=\"4000\" data-end=\"4032\"><strong data-start=\"4000\" data-end=\"4030\">It is not recommended to use:<\/strong><\/p>\n<ul data-start=\"4033\" data-end=\"4149\">\n<li data-start=\"4033\" data-end=\"4050\">red meat<\/li>\n<li data-start=\"4051\" data-end=\"4070\">beets and spinach<\/li>\n<li data-start=\"4071\" data-end=\"4095\">iron supplements<\/li>\n<li data-start=\"4096\" data-end=\"4149\">blueberries and other foods that can stain stool<\/li>\n<\/ul>\n<p data-start=\"4151\" data-end=\"4264\">Before testing for dysbiosis or microflora, you should also avoid antibiotics and probiotics for 5-7 days.<\/p>\n<p data-start=\"4151\" data-end=\"4264\">Proper preparation for laboratory tests <a href=\"https:\/\/medilab.km.ua\/en\/how-to-prepare-for-testosterone-tests-so-that-the-result-is-accurate\/\" title=\"Testosterone tests: how to prepare for accurate results\"  data-wpil-monitor-id=\"615\">analysis helps to obtain accurate<\/a> results and avoid the need to retake the tests. If you are in doubt about what you can eat before the analysis, it is best to consult with your doctor or the laboratory where the study will be conducted.<\/p>","protected":false},"excerpt":{"rendered":"<p>Why proper preparation for tests is important Imagine the situation: you are preparing for an important medical examination, you come to the laboratory, you take the tests,<\/p>","protected":false},"author":627,"featured_media":8576,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8575","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/posts\/8575","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/users\/627"}],"replies":[{"embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/comments?post=8575"}],"version-history":[{"count":0,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/posts\/8575\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/media\/8576"}],"wp:attachment":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/media?parent=8575"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/categories?post=8575"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/tags?post=8575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}