Building a Practical Diagnostic Stewardship Program
The Diagnostic Literacy Series · Part 4
Building a Practical Diagnostic Stewardship Program
The first three parts of this series covered how to think about cost, when in-house testing pays off, and how to read the evidence behind a test’s performance claims. This part turns those principles into a workflow: a repeatable, low-burden process a practice can run without hiring anyone new or buying anything.
This article is educational and independent. It does not evaluate, endorse, or recommend any manufacturer, product, or vendor, and no commercial relationship influenced its content.
“Stewardship” here does not mean restriction. It means running a deliberate, periodically-reviewed process for deciding what gets tested in-house, what gets sent out, and how those decisions get revisited as caseload, staff, and equipment change.
Why testing decisions drift without a process
Most practices don’t choose their testing mix once. It accumulates: an analyzer purchased under one owner, a reference lab relationship inherited from another, a test added because a rep made a compelling case during a slow week. None of that is wrong on its own, but without a periodic review, the testing mix can drift years away from what current caseload and staffing actually justify — usually in the direction of paying for capacity that sits idle, or sending out tests that would now break even in-house.
A stewardship program is simply the habit of checking that drift on a schedule, using the same decision framework each time, instead of relying on memory or inertia.
The four components of a working program
1. A standing test inventory
A single list of every test the practice currently runs in-house or sends out, with: monthly volume, current unit cost (landed, not list price), current turnaround time, and the clinical decision each test supports. This inventory does not need to be sophisticated — a spreadsheet is sufficient — but it needs to be kept current, because every other step depends on it.
2. A quarterly review cadence
Once a quarter, someone (this does not need to be the practice owner — a lead technician or practice manager can run it) re-applies the break-even framework from Part 2 to any test where volume has moved by more than roughly 20% since the last review, any test with a contract or consumable commitment coming up for renewal, and any test added or requested since the last review that hasn’t yet been evaluated.
3. An evidence-check step for new tests
Before any new test or analyzer is adopted, someone applies the five-question checklist from Part 3 to the manufacturer’s validation claims. This step exists to prevent the practice from making a testing-mix decision based on marketing claims that haven’t been independently verified — the single most common way testing budgets get misallocated.
4. A documented decision log
Each quarterly review, and each new-test evaluation, gets a short written record: what was decided, what data supported it, and when it will be revisited. This is not bureaucracy for its own sake — it is what makes the next review fast, because the reasoning behind the current mix doesn’t have to be reconstructed from memory.
| Component | Frequency | Owner | Time required |
|---|---|---|---|
| Test inventory update | Monthly | Practice manager or lead tech | 15–30 min |
| Break-even re-check on moved volumes | Quarterly | Practice manager or owner | 1–2 hours |
| New-test evidence check | As needed | Whoever evaluates the purchase | 30–60 min per test |
| Decision log entry | Each review | Same as reviewer | 10–15 min |
A six-step quarterly review procedure
- Pull current volumes. For each test on the inventory, confirm the trailing-90-day monthly average from your practice management system.
- Flag anything that moved. Any test where volume shifted by roughly 20% or more since the last review gets re-evaluated this cycle.
- Re-run the break-even comparison. Apply the same in-house-vs-send-out framework from Part 2, using current landed costs and current turnaround requirements — not the numbers from the original purchase decision.
- Check contract and consumable timing. Note any reagent, service, or lease contract renewing in the next two quarters, since renewal is the natural point to renegotiate or reconsider.
- Decide and record. For each flagged test: keep as-is, move in-house, move to send-out, or flag for further data-gathering. Write one or two sentences in the decision log explaining why.
- Set the next check-in. Note which items need re-review sooner than the standard quarterly cycle (for example, a test whose volume is trending but hasn’t crossed the 20% threshold yet).
Sizing the workload realistically
For a typical small-animal general practice with 15–25 tests on its inventory, the full quarterly cycle — inventory pull, flagging, re-evaluation of flagged items, and logging — takes most practices two to three hours a quarter. That is the entire time cost of the program once the initial inventory is built. The initial build (documenting every current test, its cost basis, and its volume) is the only front-loaded step, and typically takes half a day.
Frequently asked questions
Do we need practice management software to run this?
No. A spreadsheet with columns for test name, monthly volume, unit cost, turnaround time, and last-reviewed date is sufficient. Most practice management systems can export the volume data needed for step one.
Who should own this if we don’t have a dedicated office manager?
The role can rotate, or sit with whichever staff member already tracks inventory and ordering — the skill set overlaps. What matters more than who owns it is that the same person (or a documented handoff) carries the decision log forward, so context isn’t lost between reviews.
How is this different from just watching our reference lab bill?
Watching the bill tells you what you’re spending; it doesn’t tell you whether the mix is still optimal, whether a send-out test has quietly crossed the break-even volume for in-house testing, or whether a newer test’s validation evidence justifies switching. The review procedure answers those questions on a schedule rather than reactively.
What if a quarterly review finds nothing needs to change?
That’s a normal and useful outcome — log it as “reviewed, no changes” with the date. It confirms the mix is still appropriate and sets the clock for the next review, which is the point of the exercise.
Closing the series
Across this series: Part 1 built a total-cost-of-ownership framework for comparing in-house and send-out testing. Part 2 applied that framework to specific volume scenarios and identified the factors that move the break-even point. Part 3 covered how to evaluate whether a test’s own performance claims are trustworthy. This part combines all three into a quarterly habit that keeps a practice’s testing mix aligned with its actual caseload, without requiring new staff, new software, or a large time commitment.
Educational notice: this article is provided for general educational purposes for veterinary professionals and does not constitute clinical, financial, or regulatory advice. Practices should evaluate their own caseload, contracts, and regulatory obligations before changing their testing approach.
