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Present but Null Fields

In segments, it is important to note that there is a difference between fields that have no value defined for them and fields that have a null value defined for them.

If a field is not defined, there is nothing between the two | characters that delimit the field:

OBR|||||||||

A null value is indicated by two double-quote characters:

OBR|||||””||||

A field for which a null value has been defined is often referred to as present but null. Present but null fields are used in many applications.

5 Ways to Speed Up HL7 Integration

May 13, 2008iNTERFACEWARE
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HL7 VersionsCustom Segments: HL7 Z-segments
May 13, 2008 HL7 Information
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