Private companies can now analyze genetic SNPs by a simple saliva sample. This test enables connections for those seeking new relatives, but could it be used to inform people of health risk factors without harm too?
as you said it's just a prediction tool, you must take lot of precautions in regards to the results and be aware that all data will be used by pharmaceutical companies and also by government agencies...
For a diagnostic/prognostic, metabolomics would be best choice. Presence of a risk gene could not be translated due to many reasons such as alternative splicing, microRNA etc. However, metabolite does not have such influence....
For more: Unbiased data analytics for the biomarker discovery in precision medicine.