Why your genetic test result can change without your DNA changing
A reader wrote in confused. Three years ago their ancestry report said one thing. This year, same saliva, same company, it says something noticeably different. Did the lab make a mistake? Did their DNA somehow change? Neither. What changed was everything around the DNA.
Genetic results are not direct readings of fixed facts. They are interpretations, and interpretation depends on two things that keep moving: the reference data a result is compared against, and the science used to make sense of it.
The reference panel keeps growing
Ancestry and risk estimates work by comparing your DNA to large databases of people whose backgrounds are known. When those databases were dominated by people of European descent, a South Asian reader might simply have been told 'South Asian' with little detail. As more people from underrepresented regions contribute their data, the comparison gets finer. The same DNA that once read as a broad region can now resolve into something far more specific. Your ancestry did not change. The map you are being placed on did.
This is why South Asian readers, in particular, are seeing the biggest shifts right now. The gap in representation is closing, and refinement is the visible result.