Stream: terminology
Topic: Using finding codes for time spent in physiological state
Morten Ernebjerg (Nov 16 2021 at 09:42):
(This is the continuation of this thread from implementers that Lloyd suggested I take here)
I am looking at encoding measurements from wearable devices in Observations - specifically, data about when (or for how long) a user had poor posture (as detected by the device). There is, understandably, no LOINC code for "time spent in poor posture". However, there are SNOMED finding codes for poor posture. I imagine this is not an unusual situation, especially with wearables: I want to capture "period/total tim spent in state X" where X is some physiological state (in poor posture, low blood sugar, asleep etc.) for which there is a SNOMED finding code for X. One could of course define custom codes, but it seems desirable to leverage the fact that we already have a clean well-known code for X. So my question is: Is it possible to "post-coordinate" a SNOMED finding code for X in an Observation resource to communicate
- "total time spent in state X" and
- "period spent in state X"??
E.g one could image setting Observation.code to the SNOMED finding code and then, for case (1) using Observation.valueQuantity to communicate the amount of time in this state, or, for (2) to use Observation.valuePeriod to communicate the period in this state (with Observation.effectivePeriod given the total observation time/reference time). Lloyd indicated that there are mechanisms to combine observation codes and components to communicate such things - I would be very interested in hearing about that.
Rob Hausam (Nov 16 2021 at 19:00):
@Morten Ernebjerg Lloyd had originally suggested creating a custom code for use in Observation. I think that would be a reasonable way to do it. But I think what you are hoping or asking for is more about how you can use existing codes in some type of "pattern" within the Observation resource. I hate to have you move the discussion again, but I think it would better to have that discussion in the Orders and Observation WG stream rather than here.
Morten Ernebjerg (Nov 16 2021 at 19:55):
@Rob Hausam Nothing like a bit of sightseeing :smile: - will move it there when I'm back at my desk tomorrow.
Michael Lawley (Nov 17 2021 at 03:33):
Yes, there's a handful of "Duration of X" concepts in the SNOMED Observable entity hierarchy, but sadly no underlying modelling pattern that could be adopted to do some kind of (SNOMED) post coordination approach. Foe example, Duration of seizure has no relationships to a general concept of Duration nor even to Seizure.
Morten Ernebjerg (Nov 17 2021 at 07:34):
Moved to this thread in #Orders and Observation WG - @Michael Lawley I will copy your comment there as well.
Last updated: Apr 12 2022 at 19:14 UTC
