How accurate are those home DNA ancestry tests?

There are many types of home DNA ancestry tests now available for purchase.  But how accurate are those tests?

To complete the test, a swab is used to obtain a sample of saliva, then the sample is shipped to the company for testing.  The tests range from $60-$80.

In one study, saliva from a single patient was sent to two different labs.  The labs had conflicting results.  For example, one lab said a patent was 70% British, but the other lab said the patient was only 5% British.

Another study was performed on identical twins.  Their DNA ancestry should be identical, but study results showed that their ancestors came from different countries! This would be genetically impossible.

To date, researchers have found that up to 40% of the testing performed on home DNA ancestry testing is inaccurate.

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