MRCT – A study that collects health information about study participants without giving a treatment.
https://mrctcenter.org/glossaryterm/observational-study/
CDISC-Gloss – A non-interventional study in which the researchers observe the effect of a risk factor (e.g., exposure), diagnostic test, treatment or other covariate, within a study population, and where the independent variable is not under the control of the researcher.
NOTE: Major subtypes of observational studies are cohort study, case-control study, and cross-sectional study. [After Observational studies: Cohort and Case-Control Studies, JW Song, KC Chung Plast Reconstru Surg, 2010 Dec; After A Dictionary of Epidemiology (5th ed.), Porta M, ed. (2014)., Oxford University Press, New York; www.strobe-statement.org] See also cohort study, case-control study, cross-sectional study. Compare to interventional clinical trial.