What a test can show
Testing usually considers a three-variant coding haplotype rather than one marker.
Common traits
TAS2R38Sensitivity to specific bitter compounds
PAV/AVI haplotypes substantially affect perception thresholds for PTC and PROP.
RELATIONSHIP VALIDITYStrong for specific test compounds
ACTIONABILITYNo medical actionability
SOURCE CHECKLinks and claim boundaries are editorially checked; external expert review is stated only with named disclosure
Practical meaning
Testing can explain PTC/PROP perception better than everyday diet.
Where knowledge ends
Coffee, vegetable or sweet preferences depend on culture, experience, age and many receptors.
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.