Also known as:indexes · indices · indexing · indexed · legal index · statutory index
Written by attorneys · grounded in primary & secondary sources — see below
A numerical ratio produced by genetic testing that compares the likelihood an individual is the genetic parent of a child against the likelihood a random unrelated individual is the parent. The ratio must reach at least 100 to 1 and correspond to a 99 percent probability of parentage using a 0.50 prior probability to identify the individual as a genetic parent.
Sources & Authorities
How it applies
Common Examples
6
Parentage Testing Threshold Met
Imani Idowu filed a parentage action naming Ivan Ivanov as the father of her child. The laboratory performed accredited genetic testing and reported a combined relationship index of 150 to 1 together with a 99.2 percent probability of parentage using the required prior probability. Because the statutory thresholds were satisfied, the court identified Ivanov as the genetic parent subject only to a challenge by further testing that excludes him.
Paternity Index Satisfies Statute
Elena Morales filed a parentage action naming Diego Santos as the father. Accredited testing produced a combined relationship index of 135 to 1 and a 99.3 percent probability using the statutory prior. The court therefore identified Santos as the genetic parent.
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Cases
Statutes
Federal Rules
Uniform Acts
Model Codes
Restatements
Casebooks
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Course Outlines
Study Supplements
Buckley v. Valeo424 U.S. 1, 93 (1976)
Index Meets Identification Threshold
Aisha Khan commenced a parentage proceeding against Omar Farouk. The laboratory report showed a combined relationship index of 110 to 1 and 99.1 percent probability. The court identified Farouk as the genetic parent under the Act.
United States v. Richard M. Nixon, President of the United States418 U.S. 683, 710 (1974)
Statutory Index Requirement Satisfied
Rachel Green sued to establish parentage against Michael Brown. Genetic testing yielded a combined relationship index of 175 to 1 together with 99.4 percent probability. The court identified Brown as the genetic parent.
Planned Parenthood of Southeastern Pennsylvania v. Casey505 U.S. 833, 112 S. Ct. 2791, 120 L. Ed. 2d 674 (1992)
Index Confirms Genetic Parentage
Tina Patel brought a parentage action naming Rajesh Singh. The accredited laboratory reported a combined relationship index of 142 to 1 and 99.2 percent probability. The court identified Singh as the genetic parent.
BMW of North America, Inc. v. Gore517 U.S. 559, 575, 580-81 (1996)
Relationship Index Exceeds Minimum
Lisa Chen filed a parentage petition against Wei Zhang. Testing produced a combined relationship index of 128 to 1 and 99.0 percent probability. The court identified Zhang as the genetic parent subject to further exclusion testing.
Rosenberger v. Rector and Visitors of the University of Virginia515 U.S. 819 (1995)
Common questions
Frequently Asked
4
What probability and index values must genetic testing satisfy to identify a genetic parent under the Uniform Parentage Act?+
The testing must disclose at least a 99 percent probability of parentage using a prior probability of 0.50 and a combined relationship index of at least 100 to 1. These dual requirements must both be met before the tested individual is identified as a genetic parent.
Supporting sources
May a laboratory's choice of ethnic or racial database be challenged when calculating the relationship index?+
Yes. An objecting party has 30 days to request recalculation using a different ethnic or racial group. If the requested frequencies are unavailable, the objector must supply them or engage another laboratory.
Supporting sources
What happens if genetic testing identifies more than one possible genetic parent?+
The court must order each identified individual to submit to further genetic testing to determine which individual is the genetic parent.
Supporting sources
Does failure to meet the combined relationship index threshold prevent any use of the test results?+
The statute conditions conclusive identification on both the probability and index thresholds. Results that omit the index value or fall short of the statutory minimum do not identify a genetic parent under the Act.
Supporting sources
424 U.S. 1 (1976)Legislation and Regulation
…the regulated political activities. Its duties under § 438 (a) with respect to these reports and statements include filing and indexing, making them available for public inspection, preservation, and auditing and field investigations. It is directed to "serve as a national clearinghouse for information in respect to the…