High CV from Poorly Maintained Plate Reader

Symptom

High coefficient of variation (>15%) across the plate with no obvious pattern. Signal intensity may drift over time or show unexpected variability between identical samples.

1. 1 Plate reader optics (filters, lenses) are dirty or contaminated
2. 2 Instrument not calibrated according to manufacturer schedule
3. 3 Light source intensity has degraded over time
4. 4 Temperature control in reader chamber is unstable
5. 5 Reader software or firmware requires updating

1. 1 Verify that the instrument has been maintained and calibrated according to manufacturer recommendations
2. 2 Clean optical components using manufacturer-approved cleaning solutions and procedures
3. 3 Perform calibration using standard reference plates or filters provided by manufacturer
4. 4 Check maintenance logs and schedule service if instrument has not been serviced recently
5. 5 Update software/firmware to the latest version recommended by manufacturer

Related Video (2)

Bio-protocol Video ★ 85

Setting up the plate reader

"Directly addresses plate reader setup and operation, essential for understanding and diagnosing optics-related CV issues"

Bilibili (China-Accessible Mirrors) ★ 72

DuoSet ELISA — Sandwich ELISA Hands-on Protocol (Bio-Techne)

"Comprehensive hands-on ELISA protocol including plate reading step, providing context for how plate reader performance impacts result consistency"