The High-Dose Hook Effect
Why can an extremely high analyte concentration produce a deceptively low test result? Follow the binding process and see where the assay breaks down.
- Duration
- 30s
Interactive animation
Use the play button or timeline to inspect the mechanism at your own pace.
Explanation
The High-Dose Hook Effect
A sandwich lateral flow assay normally produces a stronger test line as analyte concentration rises. At an extreme concentration, however, excess analyte can saturate both capture and detection antibodies independently. The sandwich does not form, the labelled conjugate passes the test line, and the result can look falsely low.
Why it matters
A valid control line does not rule out the hook effect. Recognising the pattern is important when a weak result conflicts with the clinical picture or when an unusually concentrated sample is likely.
Key takeaway
More analyte does not always mean more signal. At very high concentrations, the assay response can bend downward and mimic a low concentration.