Numerical expression of paternity test results using predetermined indexes.

Relative chance of paternity (RCP) is a numerical expression used to indicate either paternity (near 100%) or nonpaternity (0% or close to 0%). RCP is derived by converting the paternity index (PI) to a percentage, RCP = PI/(PI+1). PI represents the chance that the alleged father is or is not the father, and is expressed as a number for a given phenotype combination of the mother-child-alleged-father trio. These PI values have been determined and are listed in several tables. Thus, one can find in these tables the individual PI value for each genetic marker system for a given trio, multiply the numbers, and convert the combined PI value into RCP. In this way, a qualitative and quantitative report of a paternity testing can be readily derived.