{"id":2499,"date":"2024-09-06T15:06:09","date_gmt":"2024-09-06T06:06:09","guid":{"rendered":"https:\/\/www.hiro-clinic.or.jp\/nippt\/%e5%87%ba%e7%94%9f%e5%89%8d%e8%a6%aa%e5%ad%90dna%e9%91%91%e5%ae%9a%e3%81%ab%e5%bf%85%e8%a6%81%e3%81%8cff%e3%81%af%e3%81%84%e3%81%8f%e3%81%a4%ef%bc%9f\/"},"modified":"2024-10-07T17:46:51","modified_gmt":"2024-10-07T08:46:51","slug":"%e5%87%ba%e7%94%9f%e5%89%8d%e8%a6%aa%e5%ad%90dna%e9%91%91%e5%ae%9a%e3%81%ab%e5%bf%85%e8%a6%81%e3%81%8cff%e3%81%af%e3%81%84%e3%81%8f%e3%81%a4%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.hiro-clinic.or.jp\/nippt\/%e5%87%ba%e7%94%9f%e5%89%8d%e8%a6%aa%e5%ad%90dna%e9%91%91%e5%ae%9a%e3%81%ab%e5%bf%85%e8%a6%81%e3%81%8cff%e3%81%af%e3%81%84%e3%81%8f%e3%81%a4%ef%bc%9f\/?lang=en","title":{"rendered":"How many FFs are required for prenatal paternity DNA testing?"},"content":{"rendered":"\n

In prenatal paternity DNA testing<\/strong>, ‘FF’ refers to the percentage of foetal DNA (Fetal Fraction)<\/strong>.Fetal DNA is the fetus’ DNA in the mother’s blood and is a very important component in Non-Invasive Prenatal DNA Testing (NIPT) and<\/strong> DNA paternity testing.<\/p>\n\n\n\n

Required Fetal Fraction (FF)<\/strong>
Generally, a minimum<\/strong> percentage of foetal DNA of at least 4%<\/strong> is required for prenatal paternity DNA testing. FF is a term used to refer to the percentage of DNA derived from the fetus. Below is more information on FF:<\/p>\n\n\n\n

Minimum quantity required:.<\/strong><\/p>\n\n\n\n

Most NIPT and prenatal DNA testing can provide accurate results if the percentage of foetal DNA (FF) is at least 4-5%<\/strong>.
If the FF is less than 4%, the test is less accurate and the results may be indeterminate.
Ideal FF:.<\/strong><\/p>\n\n\n\n

Ideally, an FF of 8% or more<\/strong> provides even more accurate results.
FF tends to increase as pregnancy progresses, especially after the sixth week of pregnancy, when<\/strong> sufficient amounts of foetal-derived DNA are often present in the blood.
Weeks of gestation and FF:.<\/strong><\/p>\n\n\n\n

Fetal-derived DNA begins to be detected in maternal blood at about 6 weeks’ gestation<\/strong>, but FF increases as the number of weeks of gestation progresses.
Most prenatal DNA tests are usually carried out after the eighth week of pregnancy.
In cases of<\/strong> insufficient FF<\/strong>
If the percentage of DNA of fetal<\/strong> origin is insufficient, the following actions may be taken:<\/p>\n\n\n\n

Re-collect blood and redo the test.
Waiting for the pregnancy weeks to progress may increase the percentage of foetal-derived DNA.
Conclusion<\/strong>
Prenatal paternity DNA testing<\/strong> requires a minimum percentage of foetal-derived DNA (FF) of at least 4%<\/strong>.Testing after the sixth week of pregnancy increases the likelihood of obtaining sufficient foetal-derived DNA.<\/p>\n","protected":false},"excerpt":{"rendered":"

In prenatal paternity DNA testing, ‘FF’ refers to the percentage of foeta…<\/p>\n","protected":false},"author":5,"featured_media":1980,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[39],"class_list":{"0":"post-2499","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-nippt-en","8":"tag-expert-en","9":"article"},"acf":[],"_links":{"self":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/posts\/2499","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/comments?post=2499"}],"version-history":[{"count":2,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/posts\/2499\/revisions"}],"predecessor-version":[{"id":5602,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/posts\/2499\/revisions\/5602"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/media\/1980"}],"wp:attachment":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/media?parent=2499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/categories?post=2499"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nippt\/wp-json\/wp\/v2\/tags?post=2499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}