Athena Core Implementation Guide
5.10.2 - release
Athena Core Implementation Guide
5.10.2 - release
Athena Core Implementation Guide - Local Development build (v5.10.2) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions
| Official URL: https://fhir.athena.io/StructureDefinition/ah-estimated-gestational-age | Version: 5.10.2 | |||
| Active as of 2026-05-26 | Computable Name: AthenahealthEstimatedGestationalAge | |||
An Extension to Observation resource for the estimated gestational age (EGA) of a pregnancy.
Athena Observations of pregnancy status can optionally supply the EGA of the pregnancy.
The value is a quantity in format weeks.days, with days running from 0-6.
Context of Use
This extension may be used on the following element(s):
Usage info
Usages:
You can also check for usages in the FHIR IG Statistics
Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.
This structure is derived from Extension
This structure is derived from Extension
| Name | Flags | Card. | Type | Description & Constraints Filter:   |
|---|---|---|---|---|
  Extension |
0..* | Extension | athenahealth Estimated Gestational Age | |
  extension |
0..0 | Extension | ||
| url |
1..1 | uri | "https://fhir.athena.io/StructureDefinition/ah-estimated-gestational-age" | |
  value[x] |
1..1 | Quantity | Estimated gestational age (EGA) of a pregnancy | |
 value |
1..1 | decimal | Numerical value (with implicit precision) | |
| comparator |
0..0 | < | <= | >= | > - how to understand the value | ||
| unit |
1..1 | string | Unit representation Required Pattern: weeks.days | |
| system |
0..0 | System that defines coded unit form | ||
 code |
0..0 | Coded form of the unit | ||
| Documentation for this format | ||||
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| Extension |
0..* | Extension | athenahealth Estimated Gestational Age | |
 id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..0 | Extension Slice: Unordered, Open by value:url | ||
| url |
1..1 | uri | "https://fhir.athena.io/StructureDefinition/ah-estimated-gestational-age" | |
| value[x] |
1..1 | Quantity | Estimated gestational age (EGA) of a pregnancy | |
| id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
| value |
Σ | 1..1 | decimal | Numerical value (with implicit precision) |
| unit |
Σ | 1..1 | string | Unit representation Required Pattern: weeks.days |
| Documentation for this format | ||||
This structure is derived from Extension
Differential View
This structure is derived from Extension
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| Extension |
0..* | Extension | athenahealth Estimated Gestational Age | |
| extension |
0..0 | Extension | ||
| url |
1..1 | uri | "https://fhir.athena.io/StructureDefinition/ah-estimated-gestational-age" | |
| value[x] |
1..1 | Quantity | Estimated gestational age (EGA) of a pregnancy | |
| value |
1..1 | decimal | Numerical value (with implicit precision) | |
| comparator |
0..0 | < | <= | >= | > - how to understand the value | ||
| unit |
1..1 | string | Unit representation Required Pattern: weeks.days | |
| system |
0..0 | System that defines coded unit form | ||
| code |
0..0 | Coded form of the unit | ||
| Documentation for this format | ||||
Snapshot View
| Name | Flags | Card. | Type | Description & Constraints Filter: |
|---|---|---|---|---|
| Extension |
0..* | Extension | athenahealth Estimated Gestational Age | |
| id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..0 | Extension Slice: Unordered, Open by value:url | ||
| url |
1..1 | uri | "https://fhir.athena.io/StructureDefinition/ah-estimated-gestational-age" | |
| value[x] |
1..1 | Quantity | Estimated gestational age (EGA) of a pregnancy | |
| id |
0..1 | string | Unique id for inter-element referencing | |
| extension |
0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url | |
| value |
Σ | 1..1 | decimal | Numerical value (with implicit precision) |
| unit |
Σ | 1..1 | string | Unit representation Required Pattern: weeks.days |
| Documentation for this format | ||||
Other representations of profile: CSV, Excel, Schematron
| Id | Grade | Path(s) | Description | Expression |
| ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children |
hasValue() or (children().count() > id.count())
|
| ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both |
extension.exists() != value.exists()
|