If you haven't already read through the proposed changes for this data type, please take a look at: http://blogs.msdn.com/healthvaultdatatypes/archive/2008/09/17/for-review-updates-to-spirometer-measurement.aspx Here is a draft version of the updated data type: Peak Flow Measurement type ...

In working with some of you, we’ve determined that the Spriometer Measurement data type is serving a bit of double-duty in its current form. As it turns out, there are two primary but very different types of measurements that this data type is currently thought to store: Spriometry and Peak Flow. ...