Analysis output will appear in this frame after clicking the "Process" button in the top frame. You might have to wait for a few seconds before anything appears.
This utility was updated on 02 May 2017 to perform a validation check on the input file, to ensure that it is in a properly sorted order.

Most people seem to have a few ROHs of up to about 200 or so consecutive tested SNPs (i.e., up to about 1 or 2 Mb in length).

Women do not have a Y-chromosome, and hence they often have No-Calls reported for the SNPs located thereon.

People whose parents are related in some way may find some longer ROHs in their own DNA. As an example, the following ROHs were found on five different chromosomes of a person whose parents were first cousins (this example uses the utility's default settings and is based on FTDNA's Illumina chip):

This person's overall autosomal homozygosity is 73.796%.

For reference, here are the corresponding results when using this person's data from 23andMe's Illuma chip (23andMe V2):

The overall autosomal homozygosity at 23andMe is 71.764%.

Some information about ROHs:

Some people might find that they have a No-Call run on Chromosome #6, roughly from position 79029920 to position 79088461. This region of Chromosome #6 appears to be discussed in:

Some ROHs that have been found to occur frequently are listed in the following publication: Some other ROH utilities:
Available utilities for processing unzipped autosomal files from Family Tree DNA and/or 23andMe:

These utilities were developed by David Pike.

My original motivation for developing these utilities was so that I could privately perform some advanced analysis of autosomal DNA results, with my objective being to better pursue genealogical research within my own family. Instead of limiting these utilities to my own personal use, I have made them available in the hope that they might assist other members of the genetic genealogy community with their own individual research goals.

Given the do-it-yourself nature of the intended user, the utilities are presented with minimal documentation and without verbose explanation of analysis results. Also note that the analysis performed by these utilities is based on my own methodology and implementation, whereas Family Tree DNA, 23andMe and AncestryDNA have their own proprietary analysis methodologies. Differences in methodology may give rise to minor interpretive differences between their analysis and that performed by my utilities.

Some other notes about these utilities:


If you want to be express thanks for these utilities, then here are some helpful things you can do:

If you aren't yet a Dropbox user, then if you sign up by following this link it will provide me with a bonus quantity of disk space (which will come in handy for some of the other stuff that I do).

The Family History Society of Newfoundland and Labrador is a registered charity that could use some assistance. Financial donations are tax deductible (at least in Canada).