The accuracy of DNA testing is the most reliable way to identify parents, relatives, genetics in general. DNA tests are 99.9 % accurate. Though some may claim the 100%, there are exceptions to every rule. 99% or greater is accepted in most courtrooms.

There is no difference in accuracy between a DNA blood test and a DNA home test kit. Some testing companies will test your DNA twice to make an even more evident analysis.

 Family Tree DNA is a testing website that will not only check your paternal and maternal lineage, you can also find out your origin, where your family came from. This test is the most accurate and reliable because it checks 67 markers in your Y chromosome, most places do 12-24. You can take this at home with a cotton swab.

A reason for this .01% chance also considers the human error in the labs, mixing samples, etc. Though looking at these kind of numbers, it is once again, the most reliable means of genealogy and forensics.

Accuracy of DNA testing - Back to How is DNA Testing Done