FHIR Chat · Observation search · hapi

Stream: hapi

Topic: Observation search

Dexter (Jun 16 2021 at 10:01):

Is it possible to search for an Observation based on the interpretation code?
The Observation doc page doesn't list this attribute, so my understanding is it's not possible. Is there an alternative way?

Grahame Grieve (Jun 16 2021 at 10:21):

You can define your own search parameters

Dexter (Jun 16 2021 at 10:23):

I tried creating a search parameter for a different usecase previously, and it didn't work well. I'll give that a go again, thanks!
Using the default docker container should work, correct?

Dexter (Jun 18 2021 at 11:35):

Grahame Grieve said:

You can define your own search parameters

I have this JSON Path for finding all observations with a given interpretation code.

$.resource..interpretation[:].coding[:].code

Would something like this be correct for the top-level interpretation?
Observation.Interpretation.Where(Code = "HIGH")

Grahame Grieve (Jun 18 2021 at 12:54):

correct where?

Dexter (Jun 18 2021 at 12:56):

For an Observation, on the 'expression' part of the SearchParameter JSON POST body?

Grahame Grieve (Jun 18 2021 at 12:59):

SearchParameter.expression is FHIRPath, which is case sensitive, so it would be

Grahame Grieve (Jun 18 2021 at 13:03):

Observation.interpretation.where(code.coding.where(code in "H" | "HU" | "HH).exists())

and maybe HX?

Dexter (Jun 18 2021 at 13:04):

I assume this doesn't work when there's interpretations inside components? Then I'd need some form of Union, correct?

Dexter (Jun 18 2021 at 13:04):

If you don't mind me asking, in code in "H" | "HU" | "HH, why the H | HU | HH?

Grahame Grieve (Jun 18 2021 at 13:38):

yes you'd need a union

Grahame Grieve (Jun 18 2021 at 13:38):

did you look at the possible codes for interpretation?

Dexter (Jun 18 2021 at 13:39):

We're using High, normal, low for now. My bad forgot there were more. Thanks!

Dexter (Jun 18 2021 at 13:41):

So if I'm using a union, it'd be something like this?

Observation.interpretation.where(code.coding.where(code in "H" | "HU" | "HH).exists()).union(
    Observation.components.where(interpretation.where(
        code.coding.where(code in "H" | "HU" | "HH).exists())
    )
)

Grahame Grieve (Jun 18 2021 at 21:53):

feels about right

Dexter (Jun 21 2021 at 04:27):

Thanks! I'll give that a go!

Last updated: Apr 12 2022 at 19:14 UTC