Comparing this quarter to last, on purpose
Numbers in isolation lie. Numbers compared to the same period last year usually tell the truth.
Quarter-over-quarter and year-over-year
Compare each quarter to the previous quarter (sequential) and to the same quarter last year (seasonal). Two views protect against false alarms and false comfort.
Flag any 10%+ shift
Anything that's moved more than 10% in either direction deserves a question. Sometimes it's noise. Often it's a real change worth investigating.
Same-store metrics if you've expanded
If you added a location or service line, isolate the original lines first. Mixed-up totals hide whether the core business is healthy.
Take your version of this question further
This is one operator-tested angle on the question. Your shop, your size, your trade, and your team change the answer. Ask your specific version inside Ask a Shop Owner to get a response grounded in how owners like you actually handled it.