What is Adaptive Randomization?

Adaptive randomization is a randomization method in which participant allocation may change during a clinical trial based on predefined rules specified in the study protocol. Unlike fixed randomization methods, adaptive randomization adjusts participant assignment as the study progresses while maintaining the trial's scientific and operational objectives.

The adaptation may be based on factors such as treatment balance, participant characteristics, or interim study data, depending on the trial design.

Adaptive randomization is typically used in complex clinical trial designs where participant allocation needs to adjust according to predefined protocol criteria. It is commonly applied in adaptive studies to improve treatment balance or support specific statistical objectives while maintaining randomization integrity.

Because adaptive randomization follows protocol-defined rules, any adjustments are planned before the study begins and implemented consistently throughout trial conduct.

During study setup, study teams can configure protocol-defined adaptive randomization strategies, allocation rules, treatment arms, and randomization schedules within Clinion RTSM. As participants are enrolled, the system automatically applies the configured logic to assign participants according to the predefined study design.

For adaptive studies, Clinion also supports protocol-driven updates and mid-study configuration changes when required, allowing study teams to implement approved modifications while maintaining randomization integrity, participant traceability, and continuity throughout the trial.

A clinical trial may specify that participant allocation should remain balanced between treatment groups while also accounting for predefined stratification factors. As enrollment progresses, the configured adaptive randomization strategy automatically adjusts participant assignment according to the protocol-defined rules, helping maintain the desired study balance throughout the trial.

Randomization

Stratification

Block Randomization

Allocation Ratio

Treatment Arm

Cohort

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