We’ll tell you up front. The free preview runs an eligibility check first — if your file falls below the coverage floor for a confident call, you won’t be charged, and we can suggest a higher-coverage test as an option. The cause is always how much of the mitochondrial genome your original test read, never anything about you: everyone has a maternal line to trace.
What if my file doesn’t have enough mitochondrial coverage?
What the free eligibility check does when coverage is too low — no charge, plus a higher-coverage option.