Urea, creatinine<\/strong> \u2014 changes due to dehydration<\/p>\n<\/li>\n<\/ul>\nIf you drink coffee before taking a biochemistry test \u2014 there is a risk of getting a wrong diagnosis<\/strong>, especially in cases of suspected diabetes or liver problems.<\/p>\n3. Glucose and insulin analysis<\/h3>\n
Caffeine stimulates the release of glucose from the liver and also affects insulin sensitivity. This leads to:<\/p>\n
\n- \n
elevated fasting glucose<\/strong><\/p>\n<\/li>\n- \n
incorrect assessment of the HOMA-IR index<\/strong> (insulin resistance)<\/p>\n<\/li>\n<\/ul>\nBefore taking a sugar test or glucose tolerance test Drinking coffee is strictly not recommended.<\/strong>.<\/p>\n4. Complete blood count<\/h3>\n
Caffeine contributes to removing fluid from the body<\/strong> (diuretic effect), which temporarily increases:<\/p>\n\n- \n
hematocrit<\/strong><\/p>\n<\/li>\n- \n
red blood cell count<\/strong><\/p>\n<\/li>\n- \n
relative plasma protein concentration<\/strong><\/p>\n<\/li>\n<\/ul>\nThis does not indicate disease, but may confuse the doctor<\/strong> when interpreting.<\/p>\n5. Blood pressure, ECG, functional tests<\/h3>\n
If you drink coffee before the test:<\/p>\n
\n- \n
pulse and blood pressure increase<\/strong><\/p>\n<\/li>\n- \n
possible extrasystoles, tachycardia<\/strong><\/p>\n<\/li>\n- \n
ECG will be less informative<\/p>\n<\/li>\n<\/ul>\n
For accurate results It is best to avoid caffeine for at least 8\u201310 hours<\/strong>.<\/p>\n![\"Laboratory](\"https:\/\/medilab.km.ua\/wp-content\/themes\/woodmart\/images\/lazy.svg\")
<\/p>\n
What drinks contain caffeine besides coffee?<\/h2>\n\n- \n
Black, green, white tea<\/p>\n<\/li>\n
- \n
Energy drinks<\/p>\n<\/li>\n
- \n
Some sports supplements<\/p>\n<\/li>\n
- \n
Colas, carbonated drinks with caffeine<\/p>\n<\/li>\n
- \n
Drinks with guarana, mate<\/p>\n<\/li>\n<\/ul>\n
Even a small cup of latte or green tea<\/strong> \u2014 is already a source of caffeine, which affects test results.<\/p>\nHow long should it take after coffee to take a test?<\/h2>\n
To ensure that caffeine does not affect the results, it is recommended to:<\/p>\n
\n- \n
do not drink coffee for at least 8 hours before the test<\/strong><\/p>\n<\/li>\n- \n
do not drink caffeinated beverages in the evening<\/strong>, if the test is in the morning<\/p>\n<\/li>\n- \n
drink only water in the morning<\/strong><\/p>\n<\/li>\n<\/ul>\nSo you will get accurate, clinically meaningful indicators<\/strong>, without the errors that even a morning cup of coffee can cause.<\/p>","protected":false},"excerpt":{"rendered":"Can one cup of coffee really ruin the result? Yes. Caffeine is a biologically active substance that affects the work of the cardiovascular, nervous,<\/p>","protected":false},"author":627,"featured_media":9471,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9470","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\/9470","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=9470"}],"version-history":[{"count":0,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/posts\/9470\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/media\/9471"}],"wp:attachment":[{"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/media?parent=9470"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/categories?post=9470"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/medilab.km.ua\/en\/wp-json\/wp\/v2\/tags?post=9470"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"Laboratory](\"https:\/\/medilab.km.ua\/wp-content\/uploads\/2025\/05\/yaki-khvorobi-mozhe-pokazati-zagalniy.jpg\")
<\/p>\n