Microsoft Healthvault as Database

Microsoft HealthVault seems to be the first choice for mobile device data uploads, so we'll be looking at this as our design standard.
Here is their description of how devices connect:
A growing number of health and fitness devices—heart rate monitors, glucometers, blood pressure monitors and more—connect with HealthVault using HealthVault Connection Center. Those with the “Works with HealthVault” logo meet Microsoft’s highest standard for HealthVault connectivity. Just complete a few simple setup steps to upload data from these devices to your HealthVault record.