Call 2017/02/08
Use the approach proposed by the Pharma WG.

Kai, is there documentation (minutes or otherwise) from the Pharmacy WG on this that we can reference for this?  The minutes from San Antonio aren't showing as available yet on the Wiki.

HL7 International Pharmacy Work Group (where I am a member of) had discussed this issue in San Antonio. Re/ “Medication on CDA” the Pharmacy WG says:

to be better understood the meaning of two effectiveTime linked by an "A" operator in which one of the two elements is nullFlavored.

That is the itersection of an undefined with a defined set is undefined ......

I don't see a different meaning : the first one is when you get / will get medications; the second one the frequency of intake.

The question was how to deal when we have one shot administration:
(a) should we have a first effectiveTime with an interval with low and high equal set to a specific datetime and a second effective time with datatype TS  set to that datetime;
(b) or have simply only one effectiveTime with datatype TS  set to a specific datetime.

The first one is the solution adopted by IHE PCC the second one by C-CDA (as far as i can understand).

I've no strong opinion on this...so i leave the choice to the group... :-)

Hmm, the meaning of the two effectiveTimes is different. Here is what many implementations do:

• First effectiveTime is the use period, e.g. take these medication from 1-10 January 2017. It is always an interval. If not specified this first effectiveTime shall be nullFlavored.
  
• The second effectiveTime is the frequency pattern, like two times a day, once a week etc. This must be optional as e.g. tapered or split dose specifications will cause the need to specify the patterns in subsequent substanceAdministrations (see the entryRelationship in this template).
  

If I may I strongly suggest to follow that rule. It is by the way conformant with what we at the Pharmacy Workgroup HL7 International defined in the "Medication in CDA" project.
Furthermore you can find these definitions in ELGA:

• SBADM http://art-decor.org/art-decor/decor-templates--elgabbr-?section=templates&id=1.2.40.0.34.11.8.1.3.1&effectiveDate=2014-09-01T00:00:00
  
• Use Period http://art-decor.org/art-decor/decor-templates--elgabbr-?id=1.2.40.0.34.11.30006&effectiveDate=dynamic

or in IHE (as defined by the Swiss colleagues)

• http://art-decor.org/art-decor/decor-templates--cdachemed-?section=templates&id=2.16.756.5.30.1.1.1.1.3.10.2.10.2.10.4.1&effectiveDate=2016-06-25T00:00:00
  
• http://art-decor.org/art-decor/decor-templates--cdachemed-?id=2.16.756.5.30.1.1.1.1.3.10.2.10.10.4.1&effectiveDate=dynamic
  

Thanks

Call 20161228
allow for both IVL_TS and TS

in the second case (TS) the second effectiveTime is not required

Finding:

IHE PCC template (and the epSOS one) requests that the first effective time is an IVL_TS (not demoted to TS)
C-CDA allow both IVL_TS and TS

What we would like to do here and why ?

Suggestion:

-

Further explanation:

-