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Open mHealth HL7 FHIR

OMH to FHIR QuickStart Guide

Quick Start Mapping Guide Introduction

Quick Start Mapping Guide For Mapping OMH Schema Mappings to FHIR Elements

Measurements such as steps or heart rate are modeled using OMH schemas. These models can be used to represent instance of the measurement "over the wire" in JSON. Each OMH instance represents a datapoint such as body weight or temperature. It is composed of a "header" and "body" element whose properties are defined by a header schema and the individual datapoint schemas including the following 9 OMH schemas which are the subject of this guide:

  1. Blood Glucose
  2. Blood Pressure
  3. Body Temperature
  4. Body Weight
  5. Heart Rate
  6. Oxygen Saturation
  7. Respiratory Rate
  8. Total Sleep Time
  9. Step Count

These OMH schema can be transformed into FHIR using a series of mapping steps to convert the structure and content into a corresponding FHIR Observation resource and optionally, a [contained] FHIR Provenance resource as a record of the transformation as illustrated in the figure 1:

figure 1

The next section outlines the mapping of the OMH header schema to the both the FHIR Observation and Provenance resources. The subsequent sections below cover the mapping of the individual data point schema properties to the remaining FHIR Observation elements.

OMH Header Element to FHIR Element Mapping Table

The following 2 tables summarize the mapping of the OMH header elements to the corresponding OMH to FHIR Observation and the optional Provenance resource.

OMH Header to Observation Mapping Table

OMH element FHIR element
template profile OMH to FHIR Observation Profile
header. id Observation.identifier
header.creation_date_time Observation.issued
header.schema_id None
header.schema_id.namespace None
header.schema_id.name Observation.category,Observation.code ( see datapoint mapping table below )
header.schema_id.version None
header.acquisition_provenance None
header.acquisition_provenance.source_name Observation.device
header.acquisition_provenance.source_data_point_id Observation.identifier
header.acquisition_provenance.source_creation_date_time None
header.acquisition_provenance.modication_data_time None
header.acquisition_provenance.modality Observation.device.extension
header.user_id Observation.subject

The detailed mapping for the OMH header to FHIR Observation can be found OMH Header Detailed Mapping

OMH Header to Provenance Mapping Table

OMH element FHIR element
template profile OMH to FHIR Provenance Profile
header.id Provenance.entity.what.identifier.value (optional)
header.creation_date_time None
header.schema_id Provenance.agent.who.identifier
header.schema_id.namespace Provenance.agent.who.identifier
header.schema_id.name None
header.schema_id.version Provenance.agent.who.identifier
header.acquisition_provenance None
header.acquisition_provenance.source_name Provenance.entity.agent.who.display
header.acquisition_provenance.source_data_point_id None
header.acquisition_provenance.source_creation_date_time None
header.acquisition_provenance.last_modification_data_time None
header.acquisition_provenance.modality None
header.user_id None

The detailed mapping for the OMH header to FHIR Provenance can be found OMH Header Detailed Mapping

OMH DataPoint Element to FHIR Element Mapping Table

Each Datapoint is represented by the body properties and this table summarizes of the OMH datapoint schema type as represented by the header.schema_id.name element to the corresponding FHIR Observation category and 'code' elements and default units for quantitative measures. The detailed mapping for each datapoint can be found in the appropriate section in the Quick Start Mapping Guide

header.schema_id.name Observation.category.code Observation.code.system Observation.code.code Observation.code.display observation_value_quantity_unit(s) (list)
blood_glucose laboratory http://loinc.org 2339-0 Glucose Mass/volume in Blood ['mg/dL', 'mmol/L']
blood_pressure* vital-signs http://loinc.org 85354-9 NA*
body_temperature vital-signs http://loinc.org 8310-5 Body temperature ['K','F','C']
body_weight vital-signs http://loinc.org 29463-7 Body weight ['kg', 'g', 'lb']
heart_rate vital-signs http://loinc.org 8867-4 Heart rate ['beats/min']
oxygen_saturation vital-signs http://loinc.org 59408-5 Oxygen saturation in Arterial blood by Pulse oximetry ['%']
respiratory_rate vital-signs http://loinc.org 9279-1 Respiratory Rate ['breaths/min']
total_sleep_time physical-activity http://snomed.info/id 248263006 Duration of sleep (observable entity) ['sec', 'min', 'h']
step_count physical-activity http://loinc.org 55423-8 Number of steps in unspecified time Pedometer ['steps']

* The Blood Pressure schema does not have units, references systolic and diastolic blood pressure schemas which do. These "subschemas" are mapped to the FHIR Observation.component element discussed in the next section.

Data Point Component Mapping Table

This table summarizes these OMH datapoint schema properties and list the corresponding OMH propertied name in the Component Name column and its corresponding FHIR Observation component code and valuetype attributes. This table is used along with the OMH to FHIR concept mapping table to to populate the the FHIR Observation profile.

Component Name Component Code System Component Code Code Component Code Display Component Value Type
diastolic_blood_pressure http://loinc.org 8462-4 Diastolic blood pressure valueQuantity
systolic_blood_pressure http://loinc.org 8480-6 Systolic blood pressure valueQuantity

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