Boster Bio Life Science Blog

Blood-derived samples are among the most common materials used in ELISA. They are easy to

ELISA results can look “clean”—tight duplicates and a smooth standard curve—and still be misleading. In practice, the most common failure is not pipetting technique, but controls that do not isolate the specific failure mode (system background, non-specific binding, matrix interference, or out-of-range samples). If you want a broader setup framework before drilling into controls, Boster’s ELISA experimental design checklist is a useful companion read.

This post focuses on four controls that most reliably de-risk interpretation:

• Blank (process blank / zero standard)
• Negative control (true negative in matrix whenever possible)
• Spike-and-recovery (S&R)
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ELISA can be deceptively “clean.” The standard curve looks smooth, duplicates are close, and the plate reads without errors—yet the final concentrations don’t make biological sense, shift between runs, or fail to reproduce across days or operators.

In most cases, the issue isn’t pipetting skill. It’s experimental design: missing controls, standards that don’t match the sample range, dilution choices made without a quick pre-check, or plate reading/recording steps that ar