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Difference between revisions of "Negation Requirements Project Minutes 20 April 2016"

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'''Minutes/Conclusions Reached:'''<br/>
 
'''Minutes/Conclusions Reached:'''<br/>
  
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Term Info topic: FHIR allergy patterns:
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# Term Info
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# one field for present substance & absent assertion
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## Rob had sent a proposal to use one field, renamed "code," and to define two distinct value sets
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# present substance & absent substance field
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## This proposal might allow the use of an extension field to support a 2-element design. This was met with disquiet.
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# value field + presence field
 
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# value field + negation field
 
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* From a requirements perspective, 1-3 all work; #4 seems to introduce some ambiguity.
 
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* Lisa asks, is our goal to accurately represent semantics or help us do logical reasoning?
 
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** A good representation should support reasoning of many forms, including DL
 
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** But there is a tension between design patterns that are closer to the UI and those closer to some other use. Any form will incur translation cost & risk when used for purposes more distant from its paradigm.
 
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** FHIR, as a RESTful approach, seems more aligned with a UI/Business object perspective, so approach 1 seems like a likely approach.
 
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** Even with #1, the computability case we know about (drug/order check) will work without additional computational steps.
 
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***E.g., the check might say a) "Strawberry": does the ordered product contain strawberry?; b) "no allergy to latex": does the ordered product contain "no allergy to latex"?
 
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*** A system ''could'' check whether a value is a presence value or an absence value, but it doesn't seem necessary.
 
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*** Only positive assertions will have an effect on the check rule, but both positive and negative assertions may appear in a displayed list.
 
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** Approach 1 might imply a change to the semantics of the field. It might be advisable to consider a name change, &/or some kind of explicit semantic binding.
 
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* We identified some candidate principles
 
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# semantic differences may not require different fields, but they do require different value sets.
 
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## Using Grouping value sets
 
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## Concepts must be different - if one contains "latex" the other should contain "no allergy to latex"
 
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# double negation is bad and should be avoided, where possible.
 
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## where this is not possible, double (or subsequent) negation affirms negation, and does not transform into affirmation
 
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# Boolean "negation indicators" tend to be abstract and ambiguous. Make semantics specific where possible
 
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# Concept should be "encoded." This can be by pre- or post-coordination, and post-coordination can be by expression or model, but we want to avoid text in order to support unambiguous computation.
 
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* Do we need to negate conditions?
 
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** Examples found so far are supported by FHIR Condition verification status (e.g., refuted) for rule-outs, or by Observation for "safety check" questions ("any bleeding disorders?").
 
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** If there are edge cases, might "clinical impression" support them?
 
  
 
===Meeting Outcomes===
 
===Meeting Outcomes===

Revision as of 17:03, 20 April 2016


Back to Negation Minutes

Minutes

Meeting Information

HL7 PC-CIMI-POC Meeting Minutes

Location: PC call line

Date: 2016-04-20
Time: 11:00-12:00 ET
Facilitator Jay Lyle Note taker(s) Jay Lyle
Attendee Name Affiliation


Jay Lyle JP Systems
Serafina Versaggi
Lisa Nelson
Rob Hausam
Susan Campbell
Juliet Rubini

Agenda

Agenda Topics

  1. Term Info recap
  2. Action items
  3. Classes
  4. Principles

Minutes

Minutes/Conclusions Reached:

  1. Term Info
    1. Rob had sent a proposal to use one field, renamed "code," and to define two distinct value sets
    2. This proposal might allow the use of an extension field to support a 2-element design. This was met with disquiet.

Meeting Outcomes

Actions
  • review examples for completeness, classification for accuracy (all)
  • secure Vocabulary co-sponsorship (Rob H)
  • request involvement from SD & FHIR (Jay)
  • consolidate wiki pages (Jay)
Next Meeting/Preliminary Agenda Items
  • none identified

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