FHIR Chat · Observation with 2 units

Stream: implementers

Topic: Observation with 2 units

Krishna Moorthi (Oct 17 2019 at 12:34):

Is it possible to represent more than one value in the observation resource, each one link to a different device metric ?

BG observation : Val = Val1 = Val2 (same BG observation)
Val1 - reference to DM1 (mmol/L)
Val2 - reference ro DM2 (mg/dL)

    DM1 -> mg/dL
    DM2 -> mmol/L

So, the BG observation 1 provides values for the same measurement in 2 units.
Note:
BG - Blood Glucose
DM - DeviceMetric
Val - ValueQuantity

Lloyd McKenzie (Oct 17 2019 at 16:43):

There's a standard extension for that: http://build.fhir.org/extension-iso21090-pq-translation.html

Krishna Moorthi (Oct 18 2019 at 07:44):

Thank you.

Eric Haas (Oct 19 2019 at 01:47):

yes thanks lloyd,,, I did not know that was there - the name is opaque as hell, can I propose a new name like additionalQuantity or quantityTranslation ?

Lloyd McKenzie (Oct 19 2019 at 11:21):

Yes. Too much hold-over from v3 :)

John Silva (Oct 19 2019 at 11:27):

and reminds me of the V2 CQ (Composite Quantity) datatype, which probably influenced the V3 PQ data type. ;-)

Krishna Moorthi (Oct 21 2019 at 09:44):

Hi all - I saved this extension as xml from the fhir site. I try to add this extension in my observation profile but it is grayed out in forge. any suggestions how can we extend or use this?

Thanks

Jose Costa Teixeira (Oct 21 2019 at 09:53):

IIRC, extensions will be grayed out if e.g. their version does not match the version of the resource you have. So if you have a 4.1 extension on a 4.0 resource, that will be grayed out

Krishna Moorthi (Oct 21 2019 at 10:03):

Hi Jose - thank you for the response. May i get the link for STU3 v3.0.1?

Jose Costa Teixeira (Oct 21 2019 at 10:12):

http://www.hl7.org/fhir/directory.cfml

Michel Rutten (Oct 21 2019 at 12:21):

Also, Forge tries to verify that the extension context, as specified by the extension definition, matches the selected element. Incompatible extensions (with mismatching context) will be disabled and grayed out.

Krishna Moorthi (Oct 21 2019 at 13:00):

http://www.hl7.org/fhir/directory.cfml

Joes - thanks, BTW I was looking for STU3 PQ-Translation extension link not the FHIR STU3.

Krishna Moorthi (Oct 21 2019 at 13:02):

sorry, i couldn't find extension-iso21090-pq-translation for STU3,

Jose Costa Teixeira (Oct 21 2019 at 13:19):

it looks like that extension was only created for 3.2.0

Jose Costa Teixeira (Oct 21 2019 at 13:20):

i am not familiar with backporting, so I cannot say whether you can adopt it in a 3.0.1 resource. (technically you just go to the xml/json and change the fhirVersion

Krishna Moorthi (Oct 21 2019 at 14:51):