| type_preferred | | | |
| Active Comparator Arm | An arm describing the active comparator. | | |
| Experimental Arm | An arm describing the intervention or treatment plan for a group of participants in the study receiving test product(s). | | |
| Healthy Control | A healthy subject that is matched with an affected individual in a trial. | | |
| Intervention | An activity that produces an effect, or that is intended to alter the course of a disease in a patient or population. This is a general term that encompasses the medical, social, behavioral, and environmental acts that can have preventive, therapeutic, or palliative effects. | | |
| Negative Control | A control sample where a negative result is expected, to help correlate a positive result with the variable being tested. | | |
| No Intervention Arm | A study arm without an intervention or treatment. | | |
| Observational | Studies among cancer patients and healthy populations that involve no intervention or alteration in the status of the participants. | | |
| Other | Other or unknown type of study arm | | |
| Placebo Comparator Arm | An arm describing the placebo comparator. | | |
| Positive Control | A control sample that is known to produce a positive result if the test is working as expected. | | |
| Sham Comparator Arm | An arm describing the sham comparator. | | |
| Treatment Arm | A specific treatment plan within a clinical trial that describes the activities a subject will be involved in as he or she progresses through the study. | | |
| Vaccination | Administration of vaccines to stimulate the host's immune response. This includes any preparation intended for active immunological prophylaxis or treatment. | | |