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Archiver > GENEALOGY-DNA > 2003-03 > 1046510015


From: David Faux <>
Subject: [DNA] DYS454 & DYS455: Different Scores from FTDNA & RG
Date: Sat, 1 Mar 2003 01:13:35 -0800 (PST)


We all depend on the accuracy of the tests performed by the labs that we chose to analyze our DNA. Even one error in a set of 25 or 26 scores could have serious consequences when we are searching for "matches"; or could undermine the efforts of those doing surname studies. Unfortunately, it appears that there is inconsistency in the scores being reported by two labs.

I have had the full Y-Chromosome STR testing done by two prominent labs - 25 and 26 markers respectively. Some of the loci measured are the same, some are different. It goes without saying that the values for the loci that are same should be identical.

In comparing the overlapping loci I find that for DYS454 FTDNA reports a score of 11; RG a value of 10. Similarly for DYS455 - FTDNA = 11; RG = 10.

Both cannot be correct. There must be a calibration problem or some other type of factor which is distorting the results provided by one (or both?) labs.

Perhaps it doesn't make much difference for those who are using only one lab for their surname study - assuming that if the value is wrong, it is consistently wrong. However, many of us wish to compare our true scores to world - wide data bases. Which numbers should I put on the Ybase site?

I am requesting that a representative from each of these companies comment on this perceived problem. Thank you.

David K. Faux.




Dr. David K. Faux, 4028 Larwin Ave., Cypress, CA, 90630, USA





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