Read from HL7 File

The Read from HL7 File stage reads Health Level Seven (HL7) data from a text file as input to a dataflow. HL7 is a messaging standard used in the healthcare industry to exchange data between systems. For more information about HL7, visit http://www.hl7.org.

HL7 Message Format

Data in an HL7 message is organized hierarchically as follows:

message
   segment
      field
         component
             subcomponent

Each line of an HL7 message is a segment. A segment is a logical grouping of fields. The first three characters in a segment identify the segment type. In the above message, there are five segments MSH (message header), PID (patient identification), two NK1 (next of kin) segments, and IN1 (insurance).

Each segment consists of fields. A field contains information related to the purpose of the segment, such as the name of the insurance company in the IN1 (insurance) segment. Fields are typically (but not always) delimited by a | character.

Fields can be divided into components. Components are typically indicated by a ^ character. In the above example, the PID (patient identification) segment contains a patient name field containing LEVERKUHN^ADRIAN^C which has three parts, last name (LEVERKUHN), first name (ADRIAN), and middle initial (C). Components can be divided into subcomponents. Subcomponents are typically indicated by a & character.

This is an example of an HL7 message:

MSH|^~\&||.|||199908180016||ADT^A04|ADT.1.1698593|P|2.7
PID|1||000395122||LEVERKUHN^ADRIAN^C||19880517180606|M|||6 66TH AVE NE^^WEIMAR^DL^98052||(157)983-3296|||S||12354768|87654321
NK1|1|TALLIS^THOMAS^C|GRANDFATHER|12914 SPEM ST^^ALIUM^IN^98052|(157)883-6176
NK1|2|WEBERN^ANTON|SON|12 STRASSE MUSIK^^VIENNA^AUS^11212|(123)456-7890
IN1|1|PRE2||LIFE PRUDENT BUYER|PO BOX 23523^WELLINGTON^ON^98111|||19601||||||||THOMAS^JAMES^M|F|||||||||||||||||||ZKA535529776

Note: To create an HL7 file using the given sample text:

Copy and paste the sample text into a new document using any text editing software.
Make the required content changes.
Configure the settings to view EOL (End of Line) on the text. In your text editor, go to View > Show Symbol > Show End of Line.
Change the EOL (End of Line) Conversion format to CR (Carriage Return). In your text editor, go to Edit > EOL Conversion > Old Mac Format.
Save the HL7 file after making this format change.

File Properties Tab


Field Name	Description
Server name	Indicates whether the file you select as input is located on the computer running Spectrum Enterprise Designer or on the Spectrum Technology Platform server. If you select a file on the local computer, the server name will be My Computer. If you select a file on the server the server name will be Spectrum Technology Platform.
File name	Specifies the path to the file. Click the ellipses button (...) to access the file you want. Note: If the Spectrum Technology Platform server is running on Linux, remember that file names and paths on these platforms are case sensitive.
HL7 Version	The version of the HL7 standard used in the file you specified. For example, "2.7" means that the file uses HL7 version 2.7. The HL7 version is indicated by the 12th field in the `MSH` segment.
Character encoding	The text file encoding. For more information, see Character Encodings.
Validate	These options specify whether to check the file to ensure that it conforms to the HL7 2.7 standard. If any message in the file fails validation, it is treated as a malformed record and the malformed record options specified for the job (in Spectrum Enterprise Designer under Edit > Job Options) or for the system (in Spectrum Management Console) will take effect. Required fields Check this box if you want to make sure that each segment, field, component, and subcomponent contains the elements that are required by the HL7 2.7 standard. Length Check this box if you want to make sure that each element meets the minimum and maximum length requirements for the element as defined in the HL7 2.7 standard.
Ignore unexpected	Select these options if you want to allow messages to contain segments, fields, components, and subcomponents that are not in the expected position. The expected positions are defined in the HL7 standard or, in the case of custom message types, in the HL7 Schema Management tool in Spectrum Enterprise Designer. For example, consider this custom message schema: `MSH [PID] {ZSS} PV1 NK1 {[DG1]}` And this data: `MSH\|^~\&\|Pharm\|GenHosp\|CIS\|GenHosp\|198807050000\|\|RAS^O17\|RAS1234\|P\|2.7 ZSS\|100\|abc PID\|1234\|\|PATID1234^5^M11^ADT1^MR^GOOD HEALTH HOSPITAL~123456789^^^USSSA^SS\| PV1\|\|O\|O/R\|\|\|\|0148^ADDISON,JAMES\|0148^ADDISON,JAMES NK1\|Son\|John` In this case the segment `PID` is unexpected because it is before the `ZSS` segment. Messages that contain elements in unexpected positions are treated as malformed records and the malformed record options specified for the job (in Spectrum Enterprise Designer under Edit > Job Options) or for the system (in Spectrum Management Console) take effect. By default all the Ignore unexpected options are enabled to allow as many records as possible to be processed successfully. Segments Check this box to allow messages to contain segments that are not defined in the HL7 2.7 standard. Unexpected segments are ignored and other segments in the message are processed. Fields Check this box to allow segments to contain fields that are not defined in the HL7 2.7 standard. Unexpected fields are ignored and other fields in the segment are processed. Components Check this box to allow fields to contain components that are not defined in the HL7 2.7 standard. Unexpected components are ignored and other components in the field are processed. Subcomponents Check this box to allow components to contain subcomponents that are not defined in the HL7 2.7 standard. Unexpected subcomponents in the component are ignored and other subcomponents are processed.

Fields Tab

The Fields tab displays the segments, fields, components, and subcomponents. Use the Fields tab to select the data you want to read into the dataflow.

Segment groups, which are collections of segments that are used together to contain a category of data, are displayed using a numbering system that shows where in the message schema the group appears. Each segment group is given a label "Group_n" where "n" is a number that corresponds to the group's position in the message schema. To illustrate how the number system works, consider this example:

This example shows the field list for the message RAS^017. This message has two segment groups: RAS_017_Group_1 and RAS_017_Group_2. The "Group_1" segment group refers to the first segment group in the RAS^017 schema and the second group, "Group_2", refers to the second group listed in the RAS^017 schema.

To determine which segment group is represented by "Group_1" and "Group_2", find the description of the message RAS^017 in the document HL7 Version 2.7 Standard. You can download a copy of this document from http://www.hl7.org.

In the description of the message, find the first group, which in the case of RAS^017 is the PATIENT group. The second group in the schema is the ORDER group.

Segment groups that are nested under a segment group have an additional number appended to their group number. For example, Group_21 represents the first group nested under the second group. Further subgroups have additional numbers appended to them, such as Group_221, which for message RAS^017 represents the segment group ORDER_DETAIL_SUPPLEMENT. An example of nested groups is shown here:

The controls on the Fields tab are described in this table.

Table 1. Fields Tab
Option Name	Description
Regenerate	Click this button to populate the Fields tab with a list of all segments, fields, components, and subcomponents for the message type contained in the input file. All elements for the message type are displayed based on the HL7 schema regardless of whether the input file contains all the elements. For example, if the file contains an RAS message, the schema for the entire RAS message type will be displayed regardless of whether the input file actually contains data for all the segments, fields, components, and subcomponents. If you have defined any custom elements using the HL7 Schema Management tool in Enterprise Designer, those elements are also listed.
Expand All	Expands all elements in the fields tab so you can view all segments, fields, components, and subcomponents of the message types contained in the file.
Collapse All	Closes all nodes in the view so that only the segments are displayed. Use this to easily see the segments for the message types in the file. You can then expand individual segments in order to view the fields, components, and subcomponents in a segment.
Select all	Check this box to create dataflow fields for all segments, fields, components, and subcomponents for all message types included in the file.