Logical Data Model

Logical Data Model (LDM) / Entity / Observation

Project:

Observation

Appears In:

Diagnostic Imaging Reporting LDM Subject Area, Health Event LDM Subject Area, Clinical Notes and Documentation LDM Subject Area, CACDI LDM View, Vital Signs LDM Subject Area, Observation LDM Subject Area, Social Determinants of Health Assessment LDM Subject Area, Laboratory Test Result Reporting LDM Subject Area, Substance Use LDM Subject Area

A measurement or basic finding recorded about a patient, device or other subject typically used to capture clinical or other relevant information.

Attributes
Associations To
Associations From
Constraints
Other Links

Attribute

Type

Observation Code

Codeable Concept

Notes:

Describes what was observed. Sometimes this is called the observation "name". Value Set: <a href="https://build.fhir.org/valueset-observation-codes.html">https://build.fhir.org/valueset-observation-codes.html</a>

Observation Date Time

Date Time

Notes:

The date and time that the observation occurred.

Observation Category Code

Codeable Concept

Notes:

A classification for the observation (e.g. social history, vital signs, imaging, etc.). Value Set: <a href="https://build.fhir.org/valueset-observation-category.html">https://build.fhir.org/valueset-observation-category.html</a>

Observation Measurement Type

Codeable Concept

Notes:

Whether the observation value is measured, estimated, or calculated. Value Set: To be developed.

Observation Status Code

Codeable Concept

Notes:

The status of the observation (e.g. registered, specimen-in-process, preliminary, final, etc.). Value Set: <a href="http://hl7.org/fhir/ValueSet/observation-status">http://hl7.org/fhir/ValueSet/observation-status</a>

Observation Body Site Code

Codeable Concept

Notes:

Indicates the site on the subject's body where the observation was made (i.e. the target site). Values set are context (observation) specific. Examples of blood pressure body locations include the right upper arm, left upper arm, entire right thigh, and entire left femoral artery. Value Set: To be developed.

Observation Measurement Method Code

Codeable Concept

Notes:

Indicates the mechanism used to perform the observation. Values set are context (observation) specific. Body temperature measurement methods include using a tympanic thermometer and a skin strip thermometer. Blood pressure measurement methods include ambulatory blood pressure recording, blood pressure recorded by the patient at home, and measurement of blood pressure at the anterior tibial pulse using a doppler. Value Set: To be developed

Observation Value Code

Codeable Concept

Notes:

The actual value of the observation (as a code). Value set: To be developed.

Observation Value Quantity

Quantity

Notes:

The actual value of the observation (as a quantity).

Observation Value Integer

Integer

Notes:

The actual value of the observation (as an integer).

Observation Value Date Time

Date Time

Notes:

The actual value of the observation (as date time).

Observation Value Time

Time

Notes:

The actual value of the observation (as time).

Observation Value Text

String

Notes:

The actual value of the observation (as text).

Observation Value Range

Range

Notes:

The actual value of the observation (as a range).

Observation Value Ratio

Ratio

Notes:

The actual value of the observation (as a ratio).

Observation Value Indicator

Indicator

Notes:

The actual value of the observation (as an indicator).

Observation Value Sample Data

Sampled Data

Notes:

The actual value of the observation (as a sample data).

Observation Value Period

Observation Period

Notes:

The actual value of the observation (as a period).

Relationship	Target Entity
for	Observation Reference Range
has	Observation Component

Relationship	Target Entity
is	Procedure Reason
about	Clinical Note and Documentation
subject of	Party Group
subject of	Organization
about	Specimen
subject of	Medical Device
subject of	Location
associated with	Medical Imaging Report
subject of	Patient
has Modeling note: a single observation can be interpreted using more than one codes in the value set. <br/><br/>Examples:<br/>A blood culture can have more than one interpretations<br/>	Observation Interpretation
has	Clinical Test Result
has	Observation Document Reference
performer Alias: Asserter<br/>Who was responsible for asserting the observed value as "true".<br/><br/>FHIR<br/>	Party Role
associated with	Laboratory Test Result

Constraint

Mandatory: XOR("Observation Value *" attributes)

Unique Key: XOR (Patient, Party Group, Medical Device, Organization, Location), Observation Code, Observation Date Time

Connection	Direction	Entity
Generalization	To	Clinical Event