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Clinical Trial Glossary
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Glossary results: B

  1. Information gathered at the beginning of a study from which variations found in the study are measured.
  2. A known value or quantity with which an unknown is compared when measured or assessed.
  3. The initial time point in a clinical trial, just before a participant starts to receive the experimental treatment which is being tested. At this reference point, measurable values, such as CD4 count, are recorded. Safety and efficacy of a drug are often determined by monitoring changes from the baseline values.

When a point of view prevents impartial judgment on issues relating to the subject of that point of view. In clinical studies, bias is controlled by blinding and randomization.

A randomized trial is "blind" if the participant is not told which arm of the trial he or she is in. A clinical trial is "blind" if participants are unaware whether they are in the experimental or control arm of the study; also called masked.


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Information included in the Glossary is from Clinicaltrials.gov, which uses content from AIDSinfo, CenterWatch, Inc., ECRI, Eli Lilly and Company, MediStudy.com, Inc. and National Cancer Institute.