What a test can show
A single-variant test is not applicable to every population.
Common traits
MCM6Lactase persistence
Regulatory variants in MCM6 are associated with adult lactase persistence in some populations.
RELATIONSHIP VALIDITYStrong ancestry-dependent association
ACTIONABILITYLimited; symptoms matter more than genotype
SOURCE CHECKLinks and claim boundaries are editorially checked; external expert review is stated only with named disclosure
Practical meaning
An example of how population history changes test accuracy.
Where knowledge ends
It does not diagnose every cause of dairy intolerance.
SOURCES AND VERSION
Verifiable, not ‘trust us’.
Updated: 14 August 2026. Any clinical interpretation requires the exact variant, testing method, family information and medical context.