I've been dubious about DNA results confirming anyone is "XX% Irish." Frankly, I think DNA tests have other more important purposes, and the ethnicity percentages are more hype than accurate.

However, AncestryDNA has announced new algorithms that will "deliver ethnicity estimates with increased precision," effective yesterday (September 12). If you've tested with Ancestry, your results may already show changes.

Read more at the Ancestry blog.