{"id":52991,"date":"2025-04-25T22:10:06","date_gmt":"2025-04-26T02:10:06","guid":{"rendered":"https:\/\/www.hancockhealth.org\/mayo-health-library\/c-reactive-protein-test\/"},"modified":"2026-02-04T12:13:37","modified_gmt":"2026-02-04T17:13:37","slug":"c-reactive-protein-test","status":"publish","type":"mayo","link":"https:\/\/www.hancockhealth.org\/zh\/mayo-health-library\/c-reactive-protein-test\/","title":{"rendered":"C-reactive protein test"},"content":{"rendered":"<div class=\"container mx-auto   wordpress-block wordpress- core-\">\n<p>C-reactive protein, also called CRP, is a protein made by the liver. The level of CRP increases when there&#8217;s inflammation in the body. A simple blood test can check your C-reactive protein level.<\/p>\n<p>A high-sensitivity C-reactive protein test, also called hs-CRP test, is more sensitive than a standard C-reactive protein test. That means the high-sensitivity test can find smaller increases in C-reactive protein than a standard test can.<\/p>\n<p>The hs-CRP test can help show the risk of getting coronary artery disease. In coronary artery disease, the blood vessels of the heart narrow. Narrowed blood vessels can lead to a heart attack.<\/p>\n<p>A C-reactive protein test may be done to:<\/p>\n<ul>\n<li>Check for infection.<\/li>\n<li>Help diagnose a chronic inflammatory disease such as rheumatoid arthritis or lupus.<\/li>\n<li>Learn your risk of heart disease.<\/li>\n<li>Learn your risk of a second heart attack.<\/li>\n<\/ul>\n<h3>A note about C-reactive protein tests for heart disease<\/h3>\n<p>A high level of hs-CRP in the blood has been linked to an increased risk of heart attacks. Also, people who have had a heart attack are more likely to have another heart attack if they have a high hs-CRP level. But their risk goes down when their hs-CRP level is in the typical range.<\/p>\n<p>An hs-CRP test isn&#8217;t for everyone. The test doesn&#8217;t show the cause of inflammation. So it&#8217;s possible to have a high hs-CRP level that doesn&#8217;t affect the heart.<\/p>\n<p>An hs-CRP test may be most useful for people who have a 10% to 20% chance of having a heart attack within the next 10 years. This is known as intermediate risk. A healthcare professional can determine your risk using tests that look at your lifestyle choices, family history and overall health.<\/p>\n<p>A C-reactive protein test or a high-sensitivity C-reactive protein test poses little risk. You might have soreness or bruising around the site where blood was drawn. Rarely, the site can become infected.<\/p>\n<p>To prepare for a C-reactive protein test, your healthcare team might ask you not to do hard exercise, such as intense weight training or a long run, before the test. Such activities can cause a sudden jump in the C-reactive protein level.<\/p>\n<p>Some medicines can affect the CRP level. Tell your healthcare professional about the medicines you take, including those you bought without a prescription.<\/p>\n<p>If your blood sample will be used for other tests, you may be told not to eat or drink for a while before the test. For example, if you&#8217;re having an hs-CRP test to check for heart disease, you also might have a cholesterol test at the same time.<\/p>\n<p>Your healthcare professional tells you how to prepare for your test.<\/p>\n<p>A C-reactive protein test requires a blood sample. To take a sample of your blood, a healthcare professional places a needle into a vein in your arm, usually at the bend of the elbow. The blood sample goes to a lab to be tested. You can return to your usual activities right away.<\/p>\n<p>It can take a few days to get C-reactive protein test results. Your healthcare professional can explain what the test results mean.<\/p>\n<p>C-reactive protein is measured in milligrams per liter (mg\/L). Results equal to or greater than 8 mg\/L or 10 mg\/L are considered high. Range values vary depending on the lab doing the test.<\/p>\n<p>A high hs-CRP test result is a sign of inflammation. It may be due to serious infection, injury or chronic disease. Your healthcare professional may recommend other tests to determine the cause.<\/p>\n<p>Results for an hs-CRP test are usually given as follows:<\/p>\n<ul>\n<li><strong>Lower risk of heart disease:<\/strong> Less than 2.0 mg\/L.<\/li>\n<li><strong>Higher risk of heart disease:<\/strong> Equal to or greater than 2.0 mg\/L.<\/li>\n<\/ul>\n<p>A person&#8217;s CRP levels vary over time. A coronary artery disease risk assessment usually is based on the average of two hs-CRP tests. It&#8217;s best if the tests are taken two weeks apart. Values above 2.0 mg\/L may mean an increased risk of heart attacks or risk of a repeat heart attack.<\/p>\n<p>The hs-CRP level is only one risk factor for coronary artery disease. Having a high hs-CRP level doesn&#8217;t always mean a higher risk of developing heart disease. Other test results can help determine the risk.<\/p>\n<p>Talk to your healthcare professional about your risk factors for heart disease and ways to try to prevent it. Lifestyle changes or medicines might help lower the risk of a heart attack.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>This simple blood test measures inflammation in the body. The results help diagnose infection and, sometimes, predict the risk of heart attack.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","tags":[1686,1687,1682],"class_list":["post-52991","mayo","type-mayo","status-publish","hentry","tag-anatomical-structure","tag-medical-procedure","tag-person-group-concept","content_type-tests-procedures"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C-reactive protein test - Hancock Health<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hancockhealth.org\/zh\/mayo-health-library\/c-reactive-protein-test\/\" \/>\n<meta property=\"og:locale\" content=\"zh_HK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C-reactive protein test - Hancock Health\" \/>\n<meta property=\"og:description\" content=\"This simple blood test measures inflammation in the body. 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