P541 CF datatype

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P541 CF Data type

Sponsoring Person

Joann Larson

Disposition

Accepted by INm __/mmm/0000 on motion by __/__ (00-00-00)

Description

Modify CF data type to be consistent with the C*E data types.

Justification

The CF Coded Element with Formatted Vale data type has a structure analogous to the deprecated CE data type. There is no provision for Coding System Version ID, Alternate Coding System Version ID or Original Text.

This proposal seeks to add the ability to specify the version IDs for the Coding System and Alternate Coding System. It is not clear whether or not there is a use case for original text.

There are a number of other proposals regarding position based semantics, provision for transmitting OIDs, and the addition of a third “triplet” which, if approved, may be relevant to this proposal.

Another consideration is that this data type is not explicitly associated with any field in v2x except indirectly as it appears in tables 0125 Value Type for use in the OBX-5 Observation Value as defined in section 7.4.2.5.

Proposed Solution

SEQ	LEN	DT	OPT	TBL#	COMPONENT NAME	COMMENTS	SEC.REF.
1	20	ST	O		Identifier		2.A.74
2	65536	FT	O		Formatted Text		2.A.31
3	20	ID	O	0396	Name of Coding System		2.A.35
4	20	ST	O		Alternate Identifier		2.A.74
5	65536	FT	O		Alternate Formatted Text		2.A.31
6	20	ID	O	0396	Name of Alternate Coding System		2.A.35
7	10	ST	C		Coding System Version ID		2.A.74
8	10	ST	O		Alternate Coding System Version ID		2.A.74
9	199	ST	O		Original Text		2.A.74

Definition: This data type transmits codes and the formatted text associated with the code. This data type can be used to transmit for the first time the formatted text for the canned text portion of a report, for example, a standard radiological description for a normal chest X ray. The receiving system can store this information and in subsequent messages only the identifier need be sent. Another potential use of this data type is transmitting master file records that contain formatted text. This data type has six components as follows: The components, primary and alternate, are defined exactly as in the CE data type with the exception of the second and fifth components, which are of the formatted text data type. Example: OBX||CF|71020^CXR^99CPMC||79989^\H\Description:\N\\.sp\\ti+4\Heart is not enlarged. There is no evidence of pneumonia, effusion, pneumothorax or any masses. \.sp+3\\H\Impression:\N\\.sp\\.ti+4\Negative chest.^99CPMC

2.A.4.7.1 Identifier (ST)

Definition: Sequence of characters (the code) that uniquely identifies the item being referenced by the <text>. Different coding schemes will have different elements here.

2.A.4.7.2 Formatted Text (FT)

Definition: Name or description of the item in question with the addition of embedded formatting instructions.

2.A.4.7.3 Name of Coding System (ID)

Definition: Contains the name of the coding system employed.

Refer to HL7 Table 0396 – Coding System in section 2.16.4, "Coding System Table" for valid values.

2.A.4.7.4 Alternate Identifier (ST)

Definition: Alternate sequence of characters (the code) that uniquely identifies the item being referenced by the <text>. This identifier is the equivalent of component one.

2.A.4.7.5 Alternate Formatted Text (FT)

Definition: Name or description of the alternate identifier in question with the addition of embedded formatting instructions.

2.A.4.7.6 Name of Alternate Coding System (ID)

Definition: Contains the name of the coding system employed for the alternate identifier.

Refer to HL7 Table 0396 – Coding System in section 2.16.4, "Coding System Table" for valid values.

2.A.4.7.7 Coding System Version ID (ST)

Definition: This component carries the version for the coding system identified by components 1-3. If CF.3 is populated with a value other than HL7nnnn or is of table type user-defined, version ID must be valued with an actual version ID. If CF.3 is populated with a value of HL7nnnn and nnnn is of table type HL7, version ID may have an actual value or it may be absent. If version ID is absent, it will be interpreted to have the same value as the HL7 version number in the message header.

2.A.4.7.8 Alternate Coding System Version ID (ST)

Definition: This component carries the version for the coding system identified by components 4-6.

2.A.4.7.9 Original Text (ST)

The original text that was available to an automated process or a human before a specific code was assigned.