Standard Curve Plateau at High Concentration Range

Symptom

The standard curve reaches a plateau (flat response) at high standard concentrations with correspondingly low OD values, failing to show expected dose-response relationship in competitive ELISA format.

1. 1 Improper pipetting or dilution errors during standard curve preparation
2. 2 Excessive non-specific binding interfering with competitive binding
3. 3 Insufficient incubation time preventing equilibrium in competitive binding
4. 4 Standard concentrations exceed the saturation point of the competitive assay

1. 1 Verify accurate pipetting and proper serial dilution of standard curve points
2. 2 Check and reduce non-specific binding following background troubleshooting protocol
3. 3 Extend incubation time to allow competitive binding to reach equilibrium
4. 4 Adjust standard curve range to ensure high concentrations remain within dynamic range

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