🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 120 (from laksa042)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa120.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical, ml_categories_json AS ml_categories_json, ml_types_json AS ml_types_json, ml_intent_types_json AS ml_intent_types_json, meta_language AS meta_language, attrs_author AS attrs_author, ifNull(toUnixTimestamp(attrs_publish_time), 0) AS attrs_publish_time, ifNull(toUnixTimestamp(attrs_original_publish_time), 0) AS attrs_original_publish_time, ifNull(attrs_is_republished, 0) AS attrs_is_republished, ifNull(attrs_nr_words, 0) AS attrs_nr_words, ifNull(attrs_boilerpipe_nr_words, 0) AS attrs_boilerpipe_nr_words, ifNull(body_ext_links_number, 0) AS body_ext_links_number, ifNull(body_int_links_number, 0) AS body_int_links_number, ifNull(meta_nofollow, 0) AS meta_nofollow, ifNull(meta_noarchive, 0) AS meta_noarchive, ifNull(props_was_rendered, 0) AS props_was_rendered, ifNull(src_redirect, \'\') AS src_redirect, ifNull(download_time_msec, 0) AS download_time_msec, ifNull(download_ttfb_msec, 0) AS download_ttfb_msec, ifNull(download_size, 0) AS download_size FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.cepheid.com/en-US/solutions/knowing-more-matters/pcr-vs-antigen.html\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.cepheid.com/en-US/solutions/knowing-more-matters/pcr-vs-antigen.html\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.cepheid.com\/en-US\/solutions\/knowing-more-matters\/pcr-vs-antigen.html","crawl_time":1776691869,"first_indexed_time":1726008258,"http_code":200,"src_unparsed":"com,cepheid!www,\/en-US\/solutions\/knowing-more-matters\/pcr-vs-antigen.html s443","src_root_hash":"804123622525046720","history_drop_reason":null,"meta_title":"PCR Tests vs. Antigen Tests","meta_descriptions":["A PCR or polymerase chain reaction test detects genetic material from an organism by copying a small portion of the genetic material in a process called amplification. Learn how PCR tests differ from antigen tests."],"attrs_boilerpipe_text":"A PCR (polymerase chain reaction) test detects genetic material from an organism (i.e. bacteria or a virus) by copying a small portion of the genetic material in a process called amplification.\nAmplification allows for easier detection and identification of pathogens (disease-causing organisms) — sometimes even prior to symptoms surfacing — thus helping to prevent the transmission of infection and halt further disease spread. Tests that do not use amplification, such as antigen tests, might not achieve early detection because there are not enough viruses, bacteria, or other pathogens present in a patient’s sample.\n1. A patient gives a sample\nA healthcare provider takes a sample of blood, saliva, mucus, or tissue. This sample contains DNA or RNA (genetic material).\n2. The sample is placed into a machine \u2028where PCR amplification occurs\nA chemical reaction causes the sample to make billions of copies \u2028of the genetic sequence.\n3. The test is complete\nThe machine determines if pathogens are present in the amplified sample. \u2028A healthcare professional examines the results to develop a treatment plan.\nWhat is the Difference Between PCR and Antigen Testing?\nThroughout the COVID-19 pandemic, both PCR and rapid antigen testing emerged as integral to slowing the spread of the virus. However, PCR has been recognized as the gold standard for respiratory virus testing.\nPCR Tests\nPCR tests are more sensitive than antigen tests. PCR tests amplify genetic material from the virus; therefore, they can detect very small amounts of virus in a sample\nAntigen Tests\nAntigen tests detect viral proteins directly from a sample without amplification; therefore, false negatives may occur if there is a low or moderate amount of virus present","attrs_markdown":"[Skip navigation](https:\/\/www.cepheid.com\/en-US\/solutions\/knowing-more-matters\/pcr-vs-antigen.html#body-content)\n\n[![Cepheid logo](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/logos\/logo-dark-regular.svg) ![Cepheid logo](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/logos\/logo-light-regular.svg)](https:\/\/www.cepheid.com\/en-US.html)   [![Cepheid logo](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/logos\/logo-dark-minimized.svg) ![Cepheid logo](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/logos\/logo-light-minimized.svg)](https:\/\/www.cepheid.com\/en-US.html)\n\n- 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(Deutsch)](https:\/\/www.cepheid.com\/en-US\/solutions\/knowing-more-matters\/pcr-vs-antigen.html)\n\nSelected\n\n{{headingText}}\n\n{{paragraphText}}\n\n{{closeBtnLabel}}\n\n[{{continueBtnLabel}}](https:\/\/www.cepheid.com\/en-US\/solutions\/knowing-more-matters\/selectedLocaleLink)\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/-default-upload-bucket\/landing%20page%20header%20\\(d\\)%20\\(2\\)%20\\(1\\).png)\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/-default-upload-bucket\/landing%20page%20header%20\\(d\\)%20\\(2\\)%20\\(1\\).png)\n\n# Knowing More Matters {{searchText ? ' for \"' : ''}}{{searchText}}{{searchText ? '\"' : ''}}\nWhat are PCR Tests?\n\n![]()\n\n[Learn more about our fight to End TB and our Global Access program](https:\/\/www.cepheid.com\/en-US\/solutions\/global-access.html)\n\nA PCR (polymerase chain reaction) test detects genetic material from an organism (i.e. bacteria or a virus) by copying a small portion of the genetic material in a process called amplification.\n\nAmplification allows for easier detection and identification of pathogens (disease-causing organisms) — sometimes even prior to symptoms surfacing — thus helping to prevent the transmission of infection and halt further disease spread. Tests that do not use amplification, such as antigen tests, might not achieve early detection because there are not enough viruses, bacteria, or other pathogens present in a patient’s sample.\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/knowing-more-matters\/Knowing%20More%20Matters%20Banner%20PCR%20Use.png)\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/knowing-more-matters\/Mobile%20PCR%20vs%20Antigen.png)\n\n## How Does PCR Testing Work?2\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/-default-upload-bucket\/icon1PCR.png)\n\n**1\\. A patient gives a sample**\n\nA healthcare provider takes a sample of blood, saliva, mucus, or tissue. This sample contains DNA or RNA (genetic material).\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/-default-upload-bucket\/icon2PCR.png)\n\n**2\\. The sample is placed into a machine where PCR amplification occurs**\n\nA chemical reaction causes the sample to make billions of copies of the genetic sequence.\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/-default-upload-bucket\/icon3PCR.png)\n\n**3\\. The test is complete**\n\nThe machine determines if pathogens are present in the amplified sample. A healthcare professional examines the results to develop a treatment plan.\n\nWhat is the Difference Between PCR and Antigen Testing?\n\nThroughout the COVID-19 pandemic, both PCR and rapid antigen testing emerged as integral to slowing the spread of the virus. However, PCR has been recognized as the gold standard for respiratory virus testing.\n\n![dna](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/knowing-more-matters\/Cepheid-Icon-DNA-Molecule-Blue_1.png)\n\n**PCR Tests**\n\nPCR tests are more sensitive than antigen tests. PCR tests amplify genetic material from the virus; therefore, they can detect very small amounts of virus in a sample\n\n![icon molecule](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/knowing-more-matters\/Cepheid-Icon-Molecule_1.png)\n\n**Antigen Tests**\n\nAntigen tests detect viral proteins directly from a sample without amplification; therefore, false negatives may occur if there is a low or moderate amount of virus present\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/knowing-more-matters\/Knowing%20More%20Matters%20Banner.png)\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/knowing-more-matters\/Mobile%20Knowing%20More%20Banner%20.png)\n\nTime to result and intended use environment may vary, refer to individual test package insert for details.\n\n1 Medline Plus: PCR Tests. Accessed 10\/1\/2022. <https:\/\/medlineplus.gov\/lab-tests\/pcr-tests\/>\n\n2 Cleveland Clinic: COVID-19 and PCR Testing. Accessed 10\/1\/2022. <https:\/\/my.clevelandclinic.org\/health\/> diagnostics\/21462-covid19-and-pcr-testing\n\n[Feedback](https:\/\/www.cepheid.com\/en-US\/solutions\/knowing-more-matters\/pcr-vs-antigen.html)   [Request Info](https:\/\/www.cepheid.com\/en-US\/contact\/select-info-path.html)\n\n[![Cepheid logo](https:\/\/www.cepheid.com\/content\/dam\/cepheid\/en\/images\/Danaher_trustmark_tm_rgb_gs_rev_web.svg)](https:\/\/www.cepheid.com\/en-US.html)\n\n[![Cepheid logo](https:\/\/www.cepheid.com\/content\/dam\/cepheid\/en\/images\/Danaher_trustmark_tm_rgb_gs_rev_web.svg)](https:\/\/www.cepheid.com\/en-US.html)\n\nQuick Links\n\n- [About Us](https:\/\/www.cepheid.com\/en-US\/about.html)\n- [Careers](https:\/\/jobs.danaher.com\/global\/en\/cepheid)\n- [Contact Us](https:\/\/www.cepheid.com\/en-US\/support\/contact-us.html)\n- [Package Inserts](https:\/\/www.cepheid.com\/en-US\/package-inserts.html)\n\nLegal\n\n- [Privacy](https:\/\/www.cepheid.com\/en-US\/legal\/privacy.html)\n- [Compliance, Policies, and Reports](https:\/\/www.cepheid.com\/en-US\/about\/policies-reports.html)\n- [Terms of Use](https:\/\/www.cepheid.com\/en-US\/legal\/terms-of-use.html)\n- [AdvaMed Code of Ethics](https:\/\/www.advamed.org\/member-center\/resource-library\/advamed-code-of-ethics\/)\n- [Do Not Sell Or Share My Data](https:\/\/www.cepheid.com\/en-US\/legal\/california-consumer-privacy-act.html)\n- [Trademarks](https:\/\/www.cepheid.com\/en-US\/legal\/trademarks.html)\n- [Product Security](https:\/\/www.cepheid.com\/en-US\/legal\/product-security.html)\n- [Cookies Notice](https:\/\/www.cepheid.com\/en-US\/legal\/cookies-notice.html)\n- [Cookie Settings](https:\/\/www.cepheid.com\/en-US\/solutions\/knowing-more-matters\/pcr-vs-antigen.html)\n\nAgreements\n\n- [Data Processing Agreement](https:\/\/www.cepheid.com\/en-US\/systems\/data-processing-agreement.html)\n- [Partner Communities](https:\/\/www.cepheid.com\/en-US\/systems\/partner-communities.html)\n- [Business Associate Agreement](https:\/\/www.cepheid.com\/en-US\/systems\/business-associates-agreement.html)\n\n[![youtube](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/footer-image\/social-icons\/Social%20Icon-Youtube.svg)](https:\/\/www.youtube.com\/cepheidnews \"youtube\")   [![facebook](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/footer-image\/social-icons\/Social%20Icon-Facebook.svg)](https:\/\/www.facebook.com\/GeneXpertSystem \"facebook\")   [![x](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/footer-image\/social-icons\/Social%20Icon-X.svg)](https:\/\/x.com\/cepheidnews \"x\")   [![linkedin](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/footer-image\/social-icons\/Social%20Icon-LinkedIn.svg)](https:\/\/www.linkedin.com\/company\/cepheid\/ \"linkedin\")   [![instagram](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/footer-image\/social-icons\/Social%20Icon-Instagram.svg)](https:\/\/www.instagram.com\/cepheidnow\/ \"instagram\")\n\n![Cepheid test cartridge](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/footer-image\/cartridge.png)\n\n![truth has a color, look for Cepheid blue on every lab in a cartridge](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/footer-image\/overlay-text.svg)\n\nQuick Links\n\n- [About Us](https:\/\/www.cepheid.com\/en-US\/about.html)\n- [Careers](https:\/\/jobs.danaher.com\/global\/en\/cepheid)\n- [Contact Us](https:\/\/www.cepheid.com\/en-US\/support\/contact-us.html)\n- [Package Inserts](https:\/\/www.cepheid.com\/en-US\/package-inserts.html)\n\nLegal\n\n- [Privacy](https:\/\/www.cepheid.com\/en-US\/legal\/privacy.html)\n- [Compliance, Policies, and Reports](https:\/\/www.cepheid.com\/en-US\/about\/policies-reports.html)\n- [Terms of Use](https:\/\/www.cepheid.com\/en-US\/legal\/terms-of-use.html)\n- [AdvaMed Code of Ethics](https:\/\/www.advamed.org\/member-center\/resource-library\/advamed-code-of-ethics\/)\n- [Do Not Sell Or Share My Data](https:\/\/www.cepheid.com\/en-US\/legal\/california-consumer-privacy-act.html)\n- [Trademarks](https:\/\/www.cepheid.com\/en-US\/legal\/trademarks.html)\n- [Product Security](https:\/\/www.cepheid.com\/en-US\/legal\/product-security.html)\n- [Cookies Notice](https:\/\/www.cepheid.com\/en-US\/legal\/cookies-notice.html)\n- [Cookie Settings](https:\/\/www.cepheid.com\/en-US\/solutions\/knowing-more-matters\/pcr-vs-antigen.html)\n\nAgreements\n\n- [Data Processing Agreement](https:\/\/www.cepheid.com\/en-US\/systems\/data-processing-agreement.html)\n- [Partner Communities](https:\/\/www.cepheid.com\/en-US\/systems\/partner-communities.html)\n- [Business Associate Agreement](https:\/\/www.cepheid.com\/en-US\/systems\/business-associates-agreement.html)\n\n© 2026 Cepheid. Cepheid®, the Cepheid logo, GeneXpert®, Xpert®, and I-CORE® are trademarks of Cepheid, registered in the U.S. and other countries.","attrs_readable_markdown":"A PCR (polymerase chain reaction) test detects genetic material from an organism (i.e. bacteria or a virus) by copying a small portion of the genetic material in a process called amplification.\n\nAmplification allows for easier detection and identification of pathogens (disease-causing organisms) — sometimes even prior to symptoms surfacing — thus helping to prevent the transmission of infection and halt further disease spread. Tests that do not use amplification, such as antigen tests, might not achieve early detection because there are not enough viruses, bacteria, or other pathogens present in a patient’s sample.\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/-default-upload-bucket\/icon1PCR.png)\n\n**1\\. A patient gives a sample**\n\nA healthcare provider takes a sample of blood, saliva, mucus, or tissue. This sample contains DNA or RNA (genetic material).\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/-default-upload-bucket\/icon2PCR.png)\n\n**2\\. The sample is placed into a machine where PCR amplification occurs**\n\nA chemical reaction causes the sample to make billions of copies of the genetic sequence.\n\n![](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/-default-upload-bucket\/icon3PCR.png)\n\n**3\\. The test is complete**\n\nThe machine determines if pathogens are present in the amplified sample. A healthcare professional examines the results to develop a treatment plan.\n\nWhat is the Difference Between PCR and Antigen Testing?\n\nThroughout the COVID-19 pandemic, both PCR and rapid antigen testing emerged as integral to slowing the spread of the virus. However, PCR has been recognized as the gold standard for respiratory virus testing.\n\n![dna](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/knowing-more-matters\/Cepheid-Icon-DNA-Molecule-Blue_1.png)\n\n**PCR Tests**\n\nPCR tests are more sensitive than antigen tests. PCR tests amplify genetic material from the virus; therefore, they can detect very small amounts of virus in a sample\n\n![icon molecule](https:\/\/www.cepheid.com\/content\/dam\/www-cepheid-com\/images\/knowing-more-matters\/Cepheid-Icon-Molecule_1.png)\n\n**Antigen Tests**\n\nAntigen tests detect viral proteins directly from a sample without amplification; therefore, false negatives may occur if there is a low or moderate amount of virus present","meta_canonical":null,"ml_categories_json":"","ml_types_json":"","ml_intent_types_json":"","meta_language":"en-us","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1726008258,"attrs_is_republished":0,"attrs_nr_words":"1429","attrs_boilerpipe_nr_words":"274","body_ext_links_number":16,"body_int_links_number":138,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":0,"src_redirect":"","download_time_msec":821,"download_ttfb_msec":817,"download_size":21762}

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URL	https://www.cepheid.com/en-US/solutions/knowing-more-matters/pcr-vs-antigen.html
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Meta Title	PCR Tests vs. Antigen Tests
Meta Description	A PCR or polymerase chain reaction test detects genetic material from an organism by copying a small portion of the genetic material in a process called amplification. Learn how PCR tests differ from antigen tests.
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Boilerpipe Text	A PCR (polymerase chain reaction) test detects genetic material from an organism (i.e. bacteria or a virus) by copying a small portion of the genetic material in a process called amplification. Amplification allows for easier detection and identification of pathogens (disease-causing organisms) — sometimes even prior to symptoms surfacing — thus helping to prevent the transmission of infection and halt further disease spread. Tests that do not use amplification, such as antigen tests, might not achieve early detection because there are not enough viruses, bacteria, or other pathogens present in a patient’s sample. 1. A patient gives a sample A healthcare provider takes a sample of blood, saliva, mucus, or tissue. This sample contains DNA or RNA (genetic material). 2. The sample is placed into a machine  where PCR amplification occurs A chemical reaction causes the sample to make billions of copies  of the genetic sequence. 3. The test is complete The machine determines if pathogens are present in the amplified sample.  A healthcare professional examines the results to develop a treatment plan. What is the Difference Between PCR and Antigen Testing? Throughout the COVID-19 pandemic, both PCR and rapid antigen testing emerged as integral to slowing the spread of the virus. However, PCR has been recognized as the gold standard for respiratory virus testing. PCR Tests PCR tests are more sensitive than antigen tests. PCR tests amplify genetic material from the virus; therefore, they can detect very small amounts of virus in a sample Antigen Tests Antigen tests detect viral proteins directly from a sample without amplification; therefore, false negatives may occur if there is a low or moderate amount of virus present
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' for "' : ''}}{{searchText}}{{searchText ? '"' : ''}} What are PCR Tests? ![]() [Learn more about our fight to End TB and our Global Access program](https://www.cepheid.com/en-US/solutions/global-access.html) A PCR (polymerase chain reaction) test detects genetic material from an organism (i.e. bacteria or a virus) by copying a small portion of the genetic material in a process called amplification. Amplification allows for easier detection and identification of pathogens (disease-causing organisms) — sometimes even prior to symptoms surfacing — thus helping to prevent the transmission of infection and halt further disease spread. Tests that do not use amplification, such as antigen tests, might not achieve early detection because there are not enough viruses, bacteria, or other pathogens present in a patient’s sample. ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/knowing-more-matters/Knowing%20More%20Matters%20Banner%20PCR%20Use.png) ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/knowing-more-matters/Mobile%20PCR%20vs%20Antigen.png) ## How Does PCR Testing Work?2 ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/-default-upload-bucket/icon1PCR.png) 1\. A patient gives a sample A healthcare provider takes a sample of blood, saliva, mucus, or tissue. This sample contains DNA or RNA (genetic material). ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/-default-upload-bucket/icon2PCR.png) 2\. The sample is placed into a machine where PCR amplification occurs A chemical reaction causes the sample to make billions of copies of the genetic sequence. ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/-default-upload-bucket/icon3PCR.png) 3\. The test is complete The machine determines if pathogens are present in the amplified sample. A healthcare professional examines the results to develop a treatment plan. What is the Difference Between PCR and Antigen Testing? Throughout the COVID-19 pandemic, both PCR and rapid antigen testing emerged as integral to slowing the spread of the virus. However, PCR has been recognized as the gold standard for respiratory virus testing. ![dna](https://www.cepheid.com/content/dam/www-cepheid-com/images/knowing-more-matters/Cepheid-Icon-DNA-Molecule-Blue_1.png) PCR Tests PCR tests are more sensitive than antigen tests. PCR tests amplify genetic material from the virus; therefore, they can detect very small amounts of virus in a sample ![icon molecule](https://www.cepheid.com/content/dam/www-cepheid-com/images/knowing-more-matters/Cepheid-Icon-Molecule_1.png) Antigen Tests Antigen tests detect viral proteins directly from a sample without amplification; therefore, false negatives may occur if there is a low or moderate amount of virus present ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/knowing-more-matters/Knowing%20More%20Matters%20Banner.png) ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/knowing-more-matters/Mobile%20Knowing%20More%20Banner%20.png) Time to result and intended use environment may vary, refer to individual test package insert for details. 1 Medline Plus: PCR Tests. Accessed 10/1/2022. <https://medlineplus.gov/lab-tests/pcr-tests/> 2 Cleveland Clinic: COVID-19 and PCR Testing. 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Readable Markdown	A PCR (polymerase chain reaction) test detects genetic material from an organism (i.e. bacteria or a virus) by copying a small portion of the genetic material in a process called amplification. Amplification allows for easier detection and identification of pathogens (disease-causing organisms) — sometimes even prior to symptoms surfacing — thus helping to prevent the transmission of infection and halt further disease spread. Tests that do not use amplification, such as antigen tests, might not achieve early detection because there are not enough viruses, bacteria, or other pathogens present in a patient’s sample. ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/-default-upload-bucket/icon1PCR.png) 1\. A patient gives a sample A healthcare provider takes a sample of blood, saliva, mucus, or tissue. This sample contains DNA or RNA (genetic material). ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/-default-upload-bucket/icon2PCR.png) 2\. The sample is placed into a machine where PCR amplification occurs A chemical reaction causes the sample to make billions of copies of the genetic sequence. ![](https://www.cepheid.com/content/dam/www-cepheid-com/images/-default-upload-bucket/icon3PCR.png) 3\. The test is complete The machine determines if pathogens are present in the amplified sample. A healthcare professional examines the results to develop a treatment plan. What is the Difference Between PCR and Antigen Testing? Throughout the COVID-19 pandemic, both PCR and rapid antigen testing emerged as integral to slowing the spread of the virus. However, PCR has been recognized as the gold standard for respiratory virus testing. ![dna](https://www.cepheid.com/content/dam/www-cepheid-com/images/knowing-more-matters/Cepheid-Icon-DNA-Molecule-Blue_1.png) PCR Tests PCR tests are more sensitive than antigen tests. PCR tests amplify genetic material from the virus; therefore, they can detect very small amounts of virus in a sample ![icon molecule](https://www.cepheid.com/content/dam/www-cepheid-com/images/knowing-more-matters/Cepheid-Icon-Molecule_1.png) Antigen Tests Antigen tests detect viral proteins directly from a sample without amplification; therefore, false negatives may occur if there is a low or moderate amount of virus present
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