case study

50% faster patient check-ins with a modular, FHIR-ready registration platform

Replaced King's College Hospital's legacy EHR registration workflow with a lightweight, modular web platform, improving patient registration, reducing costs, and enabling future-ready compliance.

Overview01

Replaced King's College Hospital's legacy EHR registration workflow with a lightweight, modular web platform, improving patient registration, reducing costs, and enabling future-ready compliance.

About

Client: King's College Hospital
Industry: Healthcare
Location: UAE

Scope of work

Migration of patient registration and booking from HL7 to FHIR R4
React-based registration interface with real-time validation
SMART on FHIR authentication with existing hospital credentials
Offline-first web architecture for an air-gapped network
Zebra label printer and Emirates ID card reader integration
Configuration-driven forms, codesets, and visual scheduling

Tech stack

React
Oracle Millennium
FHIR R4
SMART on FHIR

The Problem02

Modernizing Registration: A Critical First Touchpoint Held Back by Legacy Tech

King's College Hospital relied on a legacy Oracle Millennium EHR built on outdated HL7 standards. With over 15 million patient interactions requiring registration every year, the hospital needed a faster, more accessible, and interoperable system without disrupting live operations.

Heavy reliance on Oracle for licensing and specialized manpower drove up operational costs and limited autonomy.
The registration app only ran on Windows machines, ruling out tablets, kiosks, and mobile devices.
Legacy HL7 protocols could not support modern JSON-based healthcare APIs or cloud-native patterns.
A monolithic architecture made debugging, testing, and deploying changes slow and risky.
All systems ran on a private, air-gapped network, requiring a fully self-contained application.

Our Solution03

A Lightweight, Modular Platform for Modern Patient Registration

Sedin rebuilt King's College Hospital's patient registration and booking workflow on modern web technologies and FHIR R4 standards, de-risking the transition and future-proofing the system without disrupting hospital operations.

Sedin replaced brittle HL7 integrations with Oracle Millennium's FHIR R4 APIs, adding an adapter layer that turned complex healthcare data into developer-friendly objects for faster delivery.
SMART on FHIR authentication plugged the new web app into the existing login system, so clerks kept their familiar credentials with no new logins and no training overhead.
A React interface with real-time validation, offline-first caching, and single-scan Emirates ID autofill made check-ins faster across desktops, tablets, and phones.

The Process04

STEP

Audited the legacy EHR

Assessed the existing Oracle Millennium system to identify stable APIs and data contracts that could be safely leveraged.

Adopted FHIR R4 as the data backbone

Validated Oracle's FHIR API capabilities and replaced legacy HL7 integrations with modern, JSON-based interoperability.

Built an offline-first web architecture

Used service workers, local caching, and client-side state resilience to deliver a responsive UI on the hospital's air-gapped network.

Rebuilt the registration interface

Developed a React frontend with real-time validations that catch errors instantly instead of after submission.

Integrated hospital hardware

Connected Zebra label printers for instant barcode printing and built a Windows service to read Emirates ID cards for one-scan patient autofill.

Redesigned clerk workflows

Introduced focused appointment lists, tabbed check-in forms, two-click visual scheduling, and real-time duplicate checks for patient records.

Results05

50%

Faster Check-ins

Cut patient check-in time with real-time validation that guides clerks through complex forms and catches errors instantly.

100%

Device Flexibility

Enabled the registration platform to run across desktop, mobile, tablet, and browser, moving beyond Windows-only access.

30%

Lower Operational Costs

Reduced reliance on Oracle licensing and specialized staff, lowering the cost of running patient registration.

Future-Ready Compliance

Built on FHIR R4 with modular workflows so the system can evolve with new healthcare standards.

Configuration-Driven Control

Made adding new form options or codesets a matter of minutes instead of days.

Single-Scan Patient Autofill

Integrated Emirates ID card readers so clerks can auto-fill patient details with one scan.

Bottom Line

Sedin helped King's College Hospital move beyond the limits of its legacy EHR with a lightweight, modular registration platform built on FHIR. The transformation delivered faster check-ins, lower costs, and full device flexibility, giving the hospital a future-ready foundation for interoperable patient care.

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