A centrifuge looks like it's doing its job as long as it spins. But the set speed and the actual speed can quietly drift apart — and when they do, your results pay the price. Here's why RPM verification matters more than most labs realize, and how it works.
Need your centrifuge RPM verified? Request centrifuge calibration.
Why a few hundred RPM matters
Centrifugal force depends on speed. A rotor running below (or above) its set RPM changes the g-force applied to your samples, which can affect packed-cell volumes, density separations, plasma/serum quality, and molecular preps. The result isn't a dramatic failure — it's a subtle, systematic error that's hard to catch because everything looks normal.
How RPM verification works
A technician measures actual rotor speed with a calibrated, NIST-traceable tachometer and compares it to the set speed across the operating range, then verifies the timer. The as-found and as-left readings are recorded against your defined tolerance — commonly around ±5%, depending on application and manufacturer spec.
Signs your centrifuge needs a check
- It's been over a year since the last verification.
- Inconsistent separations or unexpected result drift.
- Unusual noise, vibration, or longer spin-up.
- No current calibration certificate or label on the unit.
A centrifuge that's off-speed doesn't break — it just quietly biases every spin.
Keeping it documented
Beyond result quality, CLIA-regulated labs are expected to verify centrifuge performance on a schedule, with documentation. Annual verification with a traceable certificate covers both the science and the survey. Learn more about centrifuge calibration & RPM verification, or request a readiness check to see which of your instruments are due.
Not sure where your equipment stands?
Request a free Compliance & Equipment Readiness Assessment — we’ll spot-check your gear and documentation and leave you a short report.