Migrating patient histories without losing context

What does losing context look like?

Losing context looks like a chart where the facts survived but the reasoning didn't. Context is what makes a record useful to the next vet: why a drug was stopped, what the owner was told, which lab result prompted a change. The CVO's guide to its medical records standard describes records as legal documents that represent the veterinarian's thought process, and a migration that keeps the facts but drops the reasoning fails that test.

In practice it shows up in familiar ways. A note gets split into fields and the assessment ends up cut off from the findings. Lab PDFs arrive without the patient or date they belong to. The old system's abbreviations and codes come across with no key. Corrections are imported as if they were the original entry. And an alert, say a cat who bites, lands in a field the new system never displays.

Migrating patient histories in two layers

When migrating patient histories, sort each part by what it has to do in the new system. If the software needs to act on it, move it as data. If a vet needs to read it, keep it whole:

Move what the new system must act on as data. Keep what a vet must read as a complete document.

How do attachments and images move?

Attachments move as original files with a list that ties each one to a patient, and they're the part most often left behind. Ask your old vendor for every file in its original format, plus a list linking each file to a patient ID and a date. Without that list, thousands of files named by number are close to impossible to match up.

1. Request a file manifest: file name, patient ID, date and type.
2. Check a sample. Open twenty files and confirm each lands on the right patient.
3. Keep radiographs and their reports together; the CVO guide expects radiographs to be kept as long as the record.
4. Store large imaging archives somewhere your team can still open them, even if they don't sit inside the new system.

What about the old audit trail?

Keep it. Ontario's Regulation 1093 requires electronic record systems to keep an audit trail of changes with the date and time, original content preserved, and the CVO guide says corrections must not delete the original. So a corrected note can't arrive in the new system looking like the original entry.

The safest approach is a per-patient PDF from the old system that prints each note with its history of changes. That document then becomes part of the patient's record in the new system.

How do you check a history migration?

Check by numbers first, then by reading. Counts catch missing data; reading catches lost meaning.

Start with counts of patients, visits, vaccines and attachments in the old system against the new. Then pick ten complicated patients, the diabetic cat or the dog with years of dermatology notes, and read their histories side by side. Make sure every allergy and behaviour alert shows up where the team will actually see it, and that vaccine due dates match so reminders go out on time. Don't skip deceased and inactive patients; they still fall under the five-year retention rule.

Have a vet do the reading. A practice manager can confirm the counts, but only a clinician can tell whether a note still makes sense.

Will you still meet transfer requests?

You have to. The CVO standard expects a complete record to be transferred within two business days when a client or another vet asks. During and after the migration, make sure the front desk knows where the full history lives, in the new system or in the archived documents, so a request on day three isn't a scramble.

Migrating patient histories into PetGrid

PetGrid's import and export brings clients and pets in from an Excel or CSV file, then visit and vaccine history from CSV, with a preview of every row and its issues before anything is saved. Running the same file twice adds nothing twice.

For PDFs and photos, the AI import proposes client, pet, visit and vaccine rows and flags the ones it's unsure of. Your staff review every row, and nothing is saved until they approve.

Once a chart is in, patient records keep notes, vaccines, labs and documents together, and corrections are dated addenda, never overwrites. The switching page and our guide to switching veterinary software without losing data cover the rest of the move.

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En resumen

Migrating patient histories without losing context comes down to three things: move what the new system acts on as data, keep the full narrative, attachments and audit trail as documents, and check both the counts and the meaning before the old system goes dark.

Planning a move and curious how PetGrid's import preview and review steps work? Book a short demo with the PetGrid team.