HL7 Message Analyzer

Analyzer help

ACK control IDs

When you acknowledge a message, MSA-2 must echo the inbound MSH-10 (Message Control ID). The ACK builder does this automatically. AA = accept, AE = application error, AR = reject.

MLLP framing

Wire logs often wrap ER7 with MLLP: start block 0x0B, end block 0x1C + 0x0D. Paste the whole frame — the analyzer strips framing before parse.

PHI

Nothing is uploaded. Use How it works under the message box (or Client-side only in Config) for the details, benefits, and limits. Use Scrub PHI before screenshots — it replaces common name, MRN, accession, and address fields with synthetic values. Always review the result.

Original message

The Message panel always keeps your original paste. Related templates and Inspect ACK only change what is shown in Inspect — use Back to original anytime. Export CSV / JSON downloads the visible Inspect fields. Import uses those table Values (edit PID-5 in rows, not the raw snapshot) — nothing is uploaded.

ORM → ORR → ORU

ORM = order. ORR = order response (accept/reject). ORU = observation/result (the report). Stubs copy the patient and order IDs from the original and leave anything it lacks blank; OBX text is always [[edit report text]]. ORR accept is refused for an order with errors, like an AA ACK.

Compare & batch

Use Compare… next to Copy ACK (or in Config). Comparing a message with its ACK first checks the reply: MSA-2 against MSH-10, MSH-11, version and swapped applications. Multi-message logs and MLLP wire logs show a batch picker under Message.

Message

Original paste — always kept

Runs in this browser. Nothing you paste is uploaded.

Snippets and remember

Remember last message in this browser

Pasting parses right away · Ctrl/⌘ + Enter re-parses after edits · Import opens CSV or JSON from this computer · Related templates never overwrite this field

Inspect

Paste an HL7 v2 message or load a sample.

Show empty

MSH-9—

Control ID—

Version—

Filter fields

A flat list of every field — easier to scan and search than the segment tree.

HL7 tag	Description	Value
Nothing to parse yet.

This message as a FHIR R4 transaction Bundle, following the HL7 v2-to-FHIR Implementation Guide. The table shows where each field went, and why the rest went nowhere.

Respond

Workflow stubs, related templates, ACK builder

ACK builder

Generated replies are stubs. Check them before sending to a live interface.

Code

Error text

Next messages and templates

Related messages

Response message (raw)

Select a related template, workflow stub, or Inspect ACK to view its raw HL7 here.

Message

Inspect

Respond

Compare messages

Troubleshooting challenge

Client-side only

How it works

Benefits

Limits