Schema: Observation - Blood Pressure

Introduction

The headings below list the elements of the Observation profile and describe how to populate and consume them for blood pressure data.

Important: Any element not specifically listed below will NOT be consumed.

Tip: You’ll find it helpful to read it in conjunction with the underlying Observation profile definition.

Observation Elements

id

The logical identifier of the uncategorised data Observation profile.

meta.profile

The Observation profile URL.

Fixed value https://fhir.nhs.uk/STU3/StructureDefinition/CareConnect-GPC-Observation-1

identifier

This will be populated with a globally unique and persistent identifier (that is, it doesn’t change between requests and is therefore stored with the source data). This will be scoped by a Medicus namespace for the identifier.

Where consuming systems are integrating data from this resource to their local system, they will also persist this identifier at the same time.

status

Fixed value of final.

code

The clinical code that represents the header or panel of the blood pressure.

If there is no header/panel code and only the code(s) for systolic and/or diastolic components are recorded, then this will be populated with the SNOMED codes conceptID ‘75367002’ and the descriptionID of the preferred term ‘125176019’ which has the description ‘Blood pressure’ and is an observable entity.

subject

Reference to Patient profile representing the patient against whom the data was recorded.

context

Optional reference to the Encounter profile representing the consultation context in which the blood pressure was recorded.

effectiveDateTime

Clinically relevant time/time-period for observation

issued

The audit trail timestamp representing when the data was recorded.

performer

The Practitioner profile representing the clinician responsible for making the observation.

Where the observation was performed at another organisation and an organisation profile can be populated, then that will be populated here. This will be in addition to the clinical practitioner if both are available.

If neither the performing organisation or the clinical practitioner is known then this will be populated with the details of the person that recorded the data in the system.

comment

This will include any qualifiers to the code element that were present in the sending system. These should be reported as a code and value pair as specified in the uncategorised data guidance.

It will also include any text relating to the observation.

bodysite

Bodysite from which the observation was taken.

related

Contains any hierarchical information between uncategorised data items.

• Populate related.target with a reference to the related item of uncategorised data

• Where the related item is a child of this item set related.type to has-member

• Where the related item is a parent of this item set related.type to derived-from

systolic component

component.code

The clinical code that represents systolic part of the blood pressure.

A list of the systolic blood pressure codes is included in the uncategorised guidance page here.

component.valueQuantity

The value of the observation. This will be a ‘quantity’ data type and the units used will be ‘mm[Hg]’.

component.dataAbsentReason

If there is no code or value in this component, then a data absent reason may be populated.

component.interpretation

A human-readable clinical summary relating to a test result and/or additional notes provided by the laboratory - for example, the specimen has haemolysed or has leaked.

component.referenceRange

The reference range provides a guide for interpretation of the results.

Where a reference range contains a less than ‘<’ or greater than ‘>’ operator it should be written to the referenceRange.text element as these operators are not supported in this context.

diastolic component

component.code

The clinical code that represents diastolic part of the blood pressure.

A list of the systolic blood pressure codes is included in the uncategorised guidance page here.

component.valueQuantity

The value of the observation. This will be a ‘quantity’ data type and the units used will be ‘mm[Hg]’.

component.dataAbsentReason

If there is no value in this component then a data absent reason may be populated.

component.interpretation

A human-readable clinical summary relating to a test result and/or additional notes provided by the laboratory - for example, the specimen has haemolysed or has leaked.

component.referenceRange

The reference range provides a guide for interpretation of the results.

Where a reference range contains a less than ‘<’ or greater than ‘>’ operator it should be written to the referenceRange.text element as these operators are not supported in this context.