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Learn HL7 by doing, not by reading.

The simplest way to understand HL7 v2 and FHIR. Click any part of a real message and watch each field explain itself, with examples taken from the clinical floor.

Start the pathOpen the Explorer
ORU^R01 · sleep lab
MSH|^~\&|SLEEPLAB|LELEUX|HIS|LELEUX|20260627||ORU^R01|MSG001|P|2.5.1
PID|1||1024^^^LELEUX^MR||DUBOIS^Marie^^^^^L||19850312|F
OBR|1||PSG-2026-0042|SLEEP^Polysomnographie^L|||20260626
OBX|1|NM|AHI^Indice Apnées-Hypopnées^L||28.5|/h|<5|H|||F
OBX-5 = 28.5 /h : severe apnea (normal < 5)

Two ways to learn, fused into one

The Path

Clear lessons in the right order: what HL7 is, message anatomy, segments, FHIR. Every lesson embeds the live tool.

The Lab

Paste a real message, click any field, watch it explain itself. Build your own. Debug the one from work. Learn by touching.

The full path

Six lessons, in the right order, from zero to FHIR.

See the path
  1. 1What is HL7?
  2. 2Anatomy of a message
  3. 3Message types
  4. 4Segments, one by one
  5. 5Transport and interface engines
  6. 6The move to FHIR

The tools

Explorer

A real HL7 message, every field clickable, explained plainly and translated into human language.

Builder

Build a message field by field, with real-time validation.

Debugger

Paste any message, spot the errors, understand what’s wrong.

HL7 ↔ FHIRSoon

See the same data as HL7 v2 and FHIR, side by side. The transition, finally clear.

Why not an €820 course?

Free, forever

No ugly PDF sold for a fortune. Knowledge should be open.

Interactive, not slides

You work with real messages instead of staring at dead screenshots.

Rooted in the real world

Concrete clinical cases, not recycled generic examples.