Hl7.Fhir.STU3 5.3.0

The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org. Prefix Reserved
.NET 6.0 .NET Standard 2.0
dotnet add package Hl7.Fhir.STU3 --version 5.3.0
NuGet\Install-Package Hl7.Fhir.STU3 -Version 5.3.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Hl7.Fhir.STU3" Version="5.3.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Hl7.Fhir.STU3 --version 5.3.0
#r "nuget: Hl7.Fhir.STU3, 5.3.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Hl7.Fhir.STU3 as a Cake Addin
#addin nuget:?package=Hl7.Fhir.STU3&version=5.3.0

// Install Hl7.Fhir.STU3 as a Cake Tool
#tool nuget:?package=Hl7.Fhir.STU3&version=5.3.0

Build Status

IMPORTANT The 5.0 version of the SDK contains substantial changes to the way we have organized the NuGet packages and source code. Please read before installing this new 5.0 version.


This is Firely's official support SDK for working with HL7 FHIR on the Microsoft .NET (dotnet) platform.

This SDK provides:

  • Class models for working with the FHIR data model using POCO's
  • Xml and Json parsers and serializers
  • A REST client for working with FHIR-compliant servers
  • Helper classes to work with the specification metadata, most notably StructureDefinition and generation of differentials
  • Validation of instances based on profiles
  • Evaluation FhirPath expressions

Release notes

Read the releases notes on firely-net-sdk/releases. You can find documentation about this SDK in the Firely docs site.

Getting Started

Before installing one of the NuGet packages (or clone the repo) it is important to understand that HL7 has published several updates of the FHIR specification, each with breaking changes - so you need to ensure you use the version that is right for you:

  • STU3 (published March 2017) is older, but still widely in use and fully supported by the SDK.
  • R4 (published January 2019) is in active use and fully supported by the SDK.
  • R4B (published May 2022) is in active use and fully supported by the SDK.
  • R5 (published March 26 2023) is the latest official release of the FHIR spec and is fully supported by the SDK.

Read the online documentation, and download the correct for your FHIR release. Depending on the version of FHIR you require, you'll find the relevant link to the package below. For most developers, just including this NuGet package is enough to get started.

Spec version Git branch NuGet
R5 https://github.com/FirelyTeam/firely-net-sdk/tree/release/5.0.0 https://www.nuget.org/packages/Hl7.Fhir.R5
R4B https://github.com/FirelyTeam/firely-net-sdk/tree/release/5.0.0 https://www.nuget.org/packages/Hl7.Fhir.R4B
R4 https://github.com/FirelyTeam/firely-net-sdk/tree/release/5.0.0 https://www.nuget.org/packages/Hl7.Fhir.R4
STU3 https://github.com/FirelyTeam/firely-net-sdk/tree/release/5.0.0 https://www.nuget.org/packages/Hl7.Fhir.STU3

Using a pre-release NuGet package

Every release of the SDK results in a NuGet package on the normal NuGet feed. However, each commit on our develop branch also results in a pre-release package. These are public too. So if you want to be brave and use a pre-release packages, you can do so by adding https://nuget.pkg.github.com/FirelyTeam/index.json to your NuGet sources:

  • Get a Personal Access token (PAT) from github.com with scope read:packages

  • Next open a console on your machine and run dotnet nuget add source --name github --username <USERNAME> --password <PAT> https://nuget.pkg.github.com/FirelyTeam/index.json

USERNAME: your username on GitHub PAT: your Personal access token with at least the scope read:packages


We spend a lot of effort trying to maintain compile compatibility (not binary compatibility) between minor releases of the SDK. We do, however, publish a new major version with breaking changes about once a year. The table below lists the breaking changes for each of the major upgrades.

SDK version Breaking changes
2.x https://github.com/FirelyTeam/firely-net-sdk/wiki/Breaking-changes-in-2.0
3.x https://github.com/FirelyTeam/firely-net-sdk/wiki/Breaking-changes-in-3.0
4.x https://github.com/FirelyTeam/firely-net-sdk/wiki/Breaking-changes-in-4.0
5.x https://github.com/FirelyTeam/firely-net-sdk/wiki/Breaking-changes-in-5.0

The SDK has been restructured for the 5.0 release. Please take note of the following changes if you are upgrading:

  • You should only reference the main package (Hl7.Fhir.<release>).
  • If you need the specification.zip (for validation, if you are using the ZipSource resolver), add Hl7.Fhir.Specification.Data.<release>.
  • The "old" Hl7.Fhir.Specification.<release> package is now a metapackage that will include these two packages.
  • You should not reference any other packages that existed pre-5.0 (Hl7.Fhir.ElementModel etc.)

The profile validator has been split off into its own repository. The NuGet packages for the validator that are compatible with the SDK 5.0 release can be found on NuGet.


We actively monitor the issues coming in through the GitHub repository at https://github.com/FirelyTeam/firely-net-sdk/issues. You are welcome to register your bugs and feature suggestions there. For questions and broader discussions, we use the .NET FHIR Implementers chat on Zulip.


We are welcoming contributions!

If you want to participate in this project, we're using Git Flow for our branch management. Please submit PRs with changes against the develop branche.

Note: Since the 5.0 release of the SDK, the branches for STU3 and newer have been combined in a single develop branch. This branch now contains the code for all FHIR releases from STU3 and up. We have also refactored all the common code out to projects within that branch, so the separate common repository (at https://github.com/FirelyTeam/firely-net-common) is no longer in use. This greatly simplifies management and creating PRs for these projects.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (23)

Showing the top 5 NuGet packages that depend on Hl7.Fhir.STU3:

Package Downloads
Hl7.Fhir.Specification.STU3 The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org.

Metapackage including Firely's SDK Base Class Library and specification conformance data for HL7 FHIR STU3. Its sole purpose is to provide a backwards-compatible package reference for projects that used pre-5.0 versions of the SDK.

Vonk.Fhir.R3 The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org.

Package Description


Application Component for the Alliance Business Suite.


Application Component for the Alliance Business Suite.


A FHIR Death Record model for producing and consuming FHIR death records.

GitHub repositories (1)

Showing the top 1 popular GitHub repositories that depend on Hl7.Fhir.STU3:

Repository Stars
Set of tools for helping with data (in FHIR format) anonymization.
Version Downloads Last updated
5.3.0 2,436 7/27/2023
5.2.0 9,965 5/26/2023
5.1.0 2,315 4/28/2023
5.0.0 7,414 2/17/2023
5.0.0-beta3 409 2/1/2023
5.0.0-beta2 283 1/19/2023
5.0.0-beta1 212 12/21/2022
4.3.0 76,490 9/22/2022
4.2.1 16,814 8/17/2022
4.2.0 1,093 8/16/2022
4.1.0 14,387 7/7/2022
4.0.0 32,439 5/10/2022
4.0.0-beta2 1,027 3/4/2022
4.0.0-beta1 235 2/7/2022
3.8.3 14,643 4/28/2022
3.8.2 12,503 3/28/2022
3.8.1 7,308 3/4/2022
3.8.0 54,665 1/7/2022
3.7.0 36,465 12/1/2021
3.6.0 34,991 10/15/2021
3.5.0 37,260 9/2/2021
3.4.0 29,466 6/30/2021
3.3.0 9,209 6/2/2021
3.2.0 18,854 5/4/2021
3.1.0 14,217 4/1/2021
3.0.0 17,787 2/25/2021
2.0.3 16,051 1/26/2021
2.0.2 902 1/22/2021
2.0.1 14,559 11/25/2020
2.0.0 2,609 11/16/2020
2.0.0-beta2 915 9/22/2020
2.0.0-beta1 960 7/16/2020
1.9.0 105,808 7/23/2020
1.8.0 17,526 7/2/2020
1.7.0 65,129 5/6/2020
1.6.0 57,171 3/4/2020
1.5.0 33,393 2/4/2020
1.5.0-beta1 759 12/19/2019
1.4.0 56,332 10/10/2019
1.3.0 45,100 7/10/2019
1.2.1 109,930 4/16/2019
1.2.0 16,110 3/29/2019
1.2.0-beta2 716 2/28/2019
1.2.0-beta1 707 2/20/2019
1.1.3 125,036 2/13/2019
1.1.2 40,656 1/31/2019
1.1.1 1,109 1/30/2019
1.1.0-beta1 809 12/17/2018
1.0.0 19,599 12/17/2018
1.0.0-beta1 1,022 11/7/2018
0.96.0 160,648 6/6/2018
0.95.0 57,052 4/12/2018
0.94.0 146,793 12/7/2017
0.94.0-beta2 2,270 11/8/2017
0.94.0-beta1 994 11/7/2017
0.93.5 15,359 10/17/2017
0.93.5-beta7 1,183 9/27/2017
0.93.5-beta6 3,639 9/5/2017
0.93.5-beta5 974 8/30/2017
0.93.5-beta4 996 8/29/2017
0.93.5-beta3 2,720 8/3/2017
0.93.5-beta1 1,026 7/27/2017
0.93.5-alpha1 1,140 6/15/2017
0.93.4 67,380 5/7/2017
0.93.4-alpha3 1,180 5/1/2017
0.93.4-alpha2 1,091 4/26/2017
0.93.4-alpha1 1,087 4/26/2017
0.93.3 1,921 4/26/2017
0.93.2 1,499 4/25/2017
0.93.1 1,411 4/25/2017
0.93.0 5,618 4/24/2017
0.93.0-alpha4 1,948 4/12/2017
0.93.0-alpha3 1,100 4/11/2017
0.93.0-alpha2 1,053 4/10/2017
0.93.0-alpha1 1,300 3/23/2017
0.91.0-alpha1 1,556 12/9/2016
0.90.6-alpha7 14,757 9/15/2016
0.90.5-alpha4 8,617 6/7/2016
0.90.5-alpha3 1,541 4/11/2016