CSCR-050 Make ObservationRange.negationInd and Criterion.negationInd optional

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Submitted by: Rik Smithies	Revision date: 12-Feb-2006
Submitted date: 12-Feb-2006	Change request ID: CSCR-050

Issue

ObservationRange.negationInd and Criterion.negationInd are [1..1] required

Recommendation

• Change ObservationRange.negationInd and Criterion.negationInd to be [0..1] optional

Rationale

Terminfo guidance and thinking in NHS/UK domain, rules out the use of negationInd when act.code contains a code from a scheme that already encompasses negation (eg SnomedCT). Currently negationInd cannot be refined out in models that mandate such a coding scheme, leading to potential inconsistency.

Discussion

Negation is a liabilty. If not using SNOMED you still need to say it.

Resolution

2 March 2006 1stP-M-J, 2nd AK: Accept proposal. Against 0 Abstain 0 For 8 . Approved.Hans Buitendijk, Isobel Frean, Andrew Perry, Rik Smithies; Patrick Mitchell-Jones, Austin Kreisler Heath Frankel, Patrick Lloyd