Notes from the discovery benchMicroplate assays, readers & drug discovery

A practical reference for drug discovery

Microplate assays, readers and the results between them.

Practical explanations of microplate assays, detection technology and the results you see at the bench. Explore assay choices, learn how measurements work, and find insight into controls, variability and experimental conditions.

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AN·01Assay note · Assay quality

A better Z′ can hide a worse measurement.

When bright controls look unusually consistent, detector compression may be improving the statistic while distorting the result. Here’s how to tell.

Andrew Stewart8 min read2 figures · 1 checklist
Fig. 1 — Same plate, two gain settings
Gain in linear rangeProportional
Gain near saturationCompressed
Low controlHigh controlRelative signal →
Illustrative distributions, not measured wells. They show how compression can narrow a bright control. Whether changing gain produces this behavior depends on the reader; no universal gain or saturation threshold is implied.

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