{"id":8662,"date":"2025-01-22T05:58:48","date_gmt":"2025-01-22T03:58:48","guid":{"rendered":"https:\/\/medilab.km.ua\/?p=8662"},"modified":"2026-04-20T18:54:42","modified_gmt":"2026-04-20T15:54:42","slug":"when-is-it-better-to-donate-blood-recommendations-for-accurate-results","status":"publish","type":"post","link":"https:\/\/medilab.km.ua\/en\/when-is-it-better-to-donate-blood-recommendations-for-accurate-results\/","title":{"rendered":"When is it better to donate blood: recommendations for accurate results"},"content":{"rendered":"<h2 data-start=\"68\" data-end=\"109\"><strong data-start=\"71\" data-end=\"109\">Why the timing of blood sampling matters<\/strong><\/h2>\n<p data-start=\"111\" data-end=\"392\">Blood is not just a biological fluid. Its composition is constantly changing under the influence of nutrition, physical activity, hormonal background, stress and even time of day. That is why the answer to the question <strong data-start=\"306\" data-end=\"335\">\u201cwhen is it best to donate blood\u201d<\/strong> directly affects the reliability of the analysis results.<\/p>\n<p data-start=\"394\" data-end=\"607\">If you want to get an objective picture of your health, it is important not only to follow a diet before the test, but also to choose the right <strong data-start=\"530\" data-end=\"558\">time of day for donating blood<\/strong>, take into account the characteristics of each type of research.<\/p>\n<h2 data-start=\"609\" data-end=\"655\"><strong data-start=\"612\" data-end=\"655\">The best time to donate blood is in the morning.<\/strong><\/h2>\n<p data-start=\"657\" data-end=\"839\">In most cases, doctors recommend donating blood. <strong data-start=\"711\" data-end=\"738\">in the morning, from 7:00 to 10:00<\/strong>. It is during this period that the body is in a stable physiological state after a night&#039;s rest.<\/p>\n<p data-start=\"841\" data-end=\"867\">Benefits of morning fasting:<\/p>\n<ul data-start=\"868\" data-end=\"1010\">\n<li data-start=\"868\" data-end=\"900\">the person is in a fasting state<\/li>\n<li data-start=\"901\" data-end=\"944\">hormonal background is maximally \u201cbalanced\u201d<\/li>\n<li data-start=\"945\" data-end=\"1010\">minimal influence of external factors (food, exercise, stress)<\/li>\n<\/ul>\n<h2 data-start=\"1012\" data-end=\"1063\"><strong data-start=\"1015\" data-end=\"1063\">What tests must be taken on an empty stomach in the morning?<\/strong><\/h2>\n<ul data-start=\"1065\" data-end=\"1387\">\n<li data-start=\"1065\" data-end=\"1101\"><strong data-start=\"1067\" data-end=\"1099\"><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> (ZAK)<\/strong><\/li>\n<li data-start=\"1102\" data-end=\"1193\"><strong data-start=\"1104\" data-end=\"1132\">Biochemical blood test<\/strong> (glucose, cholesterol, bilirubin, urea, creatinine, etc.)<\/li>\n<li data-start=\"1194\" data-end=\"1263\"><strong data-start=\"1196\" data-end=\"1223\">Hormonal studies<\/strong> (insulin, cortisol, TSH, testosterone)<\/li>\n<li data-start=\"1264\" data-end=\"1297\"><strong data-start=\"1266\" data-end=\"1295\">Sugar (glucose) analysis<\/strong><\/li>\n<li data-start=\"1298\" data-end=\"1317\"><strong data-start=\"1300\" data-end=\"1315\">Tumor markers<\/strong><\/li>\n<li data-start=\"1318\" data-end=\"1354\"><strong data-start=\"1320\" data-end=\"1352\">Vitamins (e.g. D, B12)<\/strong><\/li>\n<li data-start=\"1355\" data-end=\"1387\"><strong data-start=\"1357\" data-end=\"1385\">Immunological studies<\/strong><\/li>\n<\/ul>\n<p data-start=\"1389\" data-end=\"1500\">For these analyses it is important <strong data-start=\"1414\" data-end=\"1461\">not eating for 8\u201312 hours before blood collection<\/strong>, to avoid distorting the results.<\/p>\n<p data-start=\"1389\" data-end=\"1500\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-8664\" src=\"https:\/\/medilab.km.ua\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/close-up-vacutainer-filled-with-blood-investigation.jpg\" alt=\"Woman preparing for analysis\" width=\"1200\" height=\"675\" srcset=\"\" data-srcset=\"https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/close-up-vacutainer-filled-with-blood-investigation.jpg 1200w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/close-up-vacutainer-filled-with-blood-investigation-150x84.jpg 150w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/close-up-vacutainer-filled-with-blood-investigation-600x338.jpg 600w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/close-up-vacutainer-filled-with-blood-investigation-300x169.jpg 300w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/close-up-vacutainer-filled-with-blood-investigation-1024x576.jpg 1024w, https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/03\/close-up-vacutainer-filled-with-blood-investigation-768x432.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<h2 data-start=\"1502\" data-end=\"1548\"><strong data-start=\"1505\" data-end=\"1548\">When it is not necessary to donate blood in the morning<\/strong><\/h2>\n<p data-start=\"1550\" data-end=\"1669\">There is a group of tests that can be taken <strong data-start=\"1586\" data-end=\"1606\">at another time of day<\/strong>, regardless of mealtime (but it is better to clarify individually):<\/p>\n<ul data-start=\"1671\" data-end=\"1850\">\n<li data-start=\"1671\" data-end=\"1727\">Antibodies to infections (IgG, IgM to viruses, bacteria)<\/li>\n<li data-start=\"1728\" data-end=\"1747\"><a href=\"https:\/\/medilab.km.ua\/en\/genetic-testing-possibilities-types-and-characteristics-of-implementation\/\">Genetic tests<\/a><\/li>\n<li data-start=\"1748\" data-end=\"1767\">PCR research<\/li>\n<li data-start=\"1768\" data-end=\"1813\">Blood group and Rh factor testing<\/li>\n<li data-start=\"1814\" data-end=\"1850\">Control of certain chronic conditions<\/li>\n<\/ul>\n<p data-start=\"1852\" data-end=\"1951\">However, even in these cases, it is advisable to avoid physical exertion, coffee, and smoking a few hours before the test.<\/p>\n<h2 data-start=\"1953\" data-end=\"1996\"><strong data-start=\"1956\" data-end=\"1996\">When is it contraindicated to donate blood?<\/strong><\/h2>\n<ul data-start=\"1998\" data-end=\"2341\">\n<li data-start=\"1998\" data-end=\"2039\">After a night shift or a sleepless night<\/li>\n<li data-start=\"2040\" data-end=\"2093\">During periods of severe emotional or physical stress<\/li>\n<li data-start=\"2094\" data-end=\"2148\">After intense training (wait 24\u201348 hours)<\/li>\n<li data-start=\"2149\" data-end=\"2193\">After eating fatty foods, alcohol, coffee<\/li>\n<li data-start=\"2194\" data-end=\"2260\">During a cold, flu, or exacerbation of a chronic disease<\/li>\n<li data-start=\"2261\" data-end=\"2341\">For women - on the days of menstruation (for most tests, except for certain hormonal tests)<\/li>\n<\/ul>\n<h2 data-start=\"2343\" data-end=\"2397\"><strong data-start=\"2346\" data-end=\"2397\">Special cases: hormones and other sensitive tests<\/strong><\/h2>\n<h3 data-start=\"2399\" data-end=\"2415\"><a href=\"https:\/\/medilab.km.ua\/en\/analysis\/hormonal-panel\/gipotalamo-gipofizarno-nadnyrnykova-systema\/cortisol\/\"><strong data-start=\"2403\" data-end=\"2415\">Cortisol<\/strong><\/a><\/h3>\n<ul data-start=\"2416\" data-end=\"2528\">\n<li data-start=\"2416\" data-end=\"2444\">Has a clear daily rhythm.<\/li>\n<li data-start=\"2445\" data-end=\"2491\">The highest level is in the morning, between 6:00 and 9:00.<\/li>\n<li data-start=\"2492\" data-end=\"2528\">After 10:00 the level starts to drop.<\/li>\n<\/ul>\n<h3 data-start=\"2530\" data-end=\"2549\"><strong data-start=\"2534\" data-end=\"2549\">Testosterone<\/strong><\/h3>\n<ul data-start=\"2550\" data-end=\"2608\">\n<li data-start=\"2550\" data-end=\"2608\">It also fluctuates throughout the day, with a peak in the morning hours.<\/li>\n<\/ul>\n<h3 data-start=\"2610\" data-end=\"2627\"><strong data-start=\"2614\" data-end=\"2627\">Prolactin<\/strong><\/h3>\n<ul data-start=\"2628\" data-end=\"2721\">\n<li data-start=\"2628\" data-end=\"2678\">Sensitive to emotions, sleep, and physical activity.<\/li>\n<li data-start=\"2679\" data-end=\"2721\">It is best to take the test after 30 minutes of rest.<\/li>\n<\/ul>\n<p>Choosing the right time to donate blood is not just a formality, but the key to an accurate diagnosis. Following the preparation recommendations allows you to avoid false results and unnecessary worries. If you are unsure about the time or preparation for a specific analysis, it is better to contact your doctor or laboratory for clarification.<\/p>","protected":false},"excerpt":{"rendered":"<p>Why the timing of blood sampling matters Blood is not just a biological fluid. Its composition is constantly changing under the influence of nutrition,<\/p>","protected":false},"author":627,"featured_media":8663,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8662","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\/8662","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=8662"}],"version-history":[{"count":0,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/posts\/8662\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/media\/8663"}],"wp:attachment":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/media?parent=8662"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/categories?post=8662"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/tags?post=8662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}