Unit Conversion for Numerical Observations

In the OBSERVATION_FACT table the UNIT_CD column stores the unit value for your numerical observations. An example of a value in UNIT_CD would be mg for milligram or gm for gram.

Although i2b2 recommends the units be normalized to a single unit we also recognize this is not always possible. In this instance, you may wish to have the units converted automatically when running a query in which a value constraint is defined. To turn this feature on you would add the following parameter to the Project you want it applied.

Type of Parameter: Project Parameter

Parameter Name: CRC_ENABLE_UNITCD_CONVERSION

For steps on how to add a project parameter please see the section titled Add Project Parameters located in this chapter.