ิ2.2 Design
The design aims at a simple, portable, digital record of
one person’s health.
2.2.1 Organization
At the conceptual level the health record of an individual
looks like Figure 2. An ideal health record would be like
a 2-dimensional matrix and allow viewing a snapshot of
all parameters in a given time range, e.g. when a problem
appears, as well as a view of the progress through
time of selected parameters, e.g. during monitoring of
progress.
The task is to design a record which is simple, yet
can be viewed in a variety of ways (cf. ISO 18308),
including a chronological view.
2.2.2 Compatibility
Standards such as HL7 version 3 [15], the CCR [12],
ASTM E1384 [16], the European EN 13606 [17], and
the (not yet official) OpenEHR [18] offer a variety of
ways to organize and encode health information. ISO
18308 defines the required features of an EHR, as mentioned
above.
Hospital information systems (HISs) use the
functionally-oriented message format HL7 (mostly ver-sion 2.x) [19]. PHRs such as (formerly) Google Health
and Microsoft Health Vault can use the CCR [12]. Because
the CCR is an object-oriented description (in
XML) of a person’s health status, it resembles an extract
from a PHR. So it is chosen as the standard message
format for communications