The truth about DNA tests

Genealogy has become an increasingly popular hobby that can lead to wonderful reunions, as well as heartbreaking discoveries

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Genealogist Gail Wilson-Waring likens it to buying a Lotto ticket – you could get very little in return or you could strike it lucky.

She's referring to genealogical DNA tests, which have revolutionised the process of tracing family trees or tracking down long-lost relatives. Since commercial DNA testing was made available around 2000, millions of people around the world have spit into tubes in the hope that their DNA profile will help provide information about their heritage or family.

There are a lot of misconceptions around the testing, says Gail, who has helped people track down family for nearly 30 years. For example, they don't always yield the hoped-for results. In some cases, for instance, if only a small number of people you're related to have also done a test, you might come to a dead end and only be matched with very distant relatives. But sometimes miracles do happen.

“Some people do a DNA test and get matched with a half-sibling straightaway,” she says. “If they've been wanting to find family – for example, if they're adopted – it can be like hitting the jackpot. And for many people who are adopted, it can be the only way of finding their heritage.”

But sometimes, the results can be a bombshell, adds Gail. For example, if siblings do tests and the results unexpectedly show they have the same mother but different fathers, that can open a whole can of worms.

“People do find out things, like their dad is not actually their father or their mum has another child nobody knew about. It can be a real shock.”

Because the results can be a surprise or a disappointment, Gail recommends people prepare themselves for all eventualities. “I always ask people why they want to do a test and how they would cope if the results aren't what they are expecting. Don't rush into it.”