Not exactly, though DNA can be used to check for certain diseases and other disorders. But it's more like... well, do you know about fingerprint matching?

[True, it wasn't as accurate as hoped before computers became involved, and even then, two humans can have such similar fingerprints its possible to get false positives. But as a comparison, it's usually well known enough from stories that she might understand it.

If not, well... he'll figure something out.]