What is the Combined Paternity Index?
The Combined Paternity Index (CPI) is obtained from the individual Paternity Indices obtained for each locus analysed. The CPI is calculated on the basis of the commonality between the genetic information obtained from the analysis against the general population, thereby generating the likelihood of paternity with a maximum result of 99.99999% Probability of Paternity. In our DNA paternity test results both the Probability of Paternity and CPI are quoted.
The Combined Paternity Index (CPI) is calculated from the Paternity Indices generated from each individual locus and gives an indication of the likelihood of Paternity between the alleged father and child as compared to analysis with the general population. The result of the CPI can go as high as 99.9999%+ but will never be quoted as 100% for scientific correctness. As you can see in the attached sample reports, both the CPI and Probability of Paternity are shown in the results of our DNA Paternity tests.In the sample result, you an also see that the DNA test report will show on the left hand coloumn each of the 16 loci analsyed. Every person carries 2 copies of a chromosome, one which he inherits from the biological father and the other from the mother. For each loci, 2 numbers are shown (or one in the case where the alleles are identical (homozygous)) representing the size of the allele. These numbers are then used to compare between the persons involved in the testing to see whether
