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ELISA (Inconsistent Results / High CV) moderate

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.
Common Causes
  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
Solutions
  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)
Bilibili (China-Accessible Mirrors) ★ 85
Thermo Fisher Microplate Reader Software Operation
"Directly addresses microplate reader software operation and instrument control, which is essential for understanding how dirty optics affect data acquisition and CV in ELISA plate readers."
Bio-protocol Video ★ 78
Setting up the plate reader
"Focuses specifically on plate reader setup procedures, providing context for understanding maintenance, optical alignment, and proper equipment operation to prevent high CV errors."
Source: abcam.com ↗
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