Summary of this article
Likelihood ratios are important in DNA testing. How many or more is considered a reliable result? Learn more about the criteria that will help you interpret appraisal results.
In paternity and DNA testing, the likelihood(Likelihood Ratio, LR)</a9> is an indicator used to determine whether or not the test results support a parent-child relationship. The higher the likelihood ratio, the more likely it is that a parent-child relationship is established.
General criteria.
- Likelihood ratio greater than 1,000: strong support for a parent-child relationship (high confidence).
- Likelihood ratio greater than 10,000: there is very strong support for a parent-child relationship (very high confidence).
According to many legal standards and international guidelines, a parent-child relationship is considered ‘almost certainly established’ if the likelihood ratio is above 10,000.At this level, the likelihood of other unrelated individuals being matched by chance is extremely low.
Interpretation notes.
- Dependent on the situation and the standard used: the interpretation of the likelihood ratio may depend on legal requirements and the standard used. For example, in some legal proceedings, a lower likelihood ratio may be accepted as establishing a parent-child relationship.
- Context-dependent: the context of the examination and additional evidence are important for the interpretation of the likelihood ratio. For example, a slightly lower likelihood ratio may be considered sufficient if other evidence or circumstances strongly support a parent-child relationship.
Summary
Generally, a parent-child relationship is considered to be significantly established if the likelihood ratio is 10,000 or more. However, specific criteria vary according to legal requirements and the case, so it is recommended that expert advice is sought.
略歴
- 1996年 慶應義塾大学医学部 卒業
- 2004年 慶應義塾大学 医学博士号 取得
- 2005年 慶應義塾大学 皮膚科学教室 助手
- 2008年 ヒロ皮フ形成クリニック 開業
- 2009年 医療法人社団福美会 理事長
- 2015年 医療法人社団福美会 理事
資格・所属
- CAPラボディレクター
- 日本皮膚科学会 皮膚科専門医
- 日本医師会 産業医
- 東京衛生検査所 指導監督医
この記事は、 ヒロクリニックNIPPTの編集・監修体制 にもとづき、資格を持つ医師が内容を確認しています。
堤 修一 (つつみ しゅういち)
医師・医学博士 / ヒロクリニック博多駅前院 院長
略歴
- 1993年 東京大学医学部医学科 卒業
- 2016〜2019年 東京大学先端科学技術研究センター 准教授
発信・関連リンク
この記事は、 ヒロクリニックNIPPTの編集・監修体制 にもとづき、資格を持つ医師が内容を確認しています。
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Supervisor of the article

Dr. Hiroshi Oka
Graduated from Keio University, Faculty of Medicine
Doctor of Medicine
Medical Doctor




