A term used to describe the situation when both the researcher and the participant in a research study know the treatment the participant is receiving. Open-label is the opposite of double-blind when neither the researcher nor the participant knows what treatment the participant is receiving.

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  • Open-label trial

    A clinical trial in which researchers and participants know which drug or vaccine is being administered.

  • Opening, vaginal

    The opening to the muscular canal that extends from the cervix to the outside of the body. In medicine, the vaginal opening is called the vestibule of the vagina.

  • Operating room

    A facility that is equipped for performing surgery. Abbreviated OR.

  • Operation

    In medicine, a surgical procedure. Many operations are named after persons. They range from A to Z, from the Abbe operation (on the lip) to the Ziegler operation (on the eye).

  • Operation, Blalock-Taussig

    A pioneering heart operation named after the American surgeon Alfred Blalock (1899-1964) and the pediatric cardiologist Helen B. Taussig (1898-1986). Dr. Taussig designed and Dr. Blalock carried out the first “blue-baby” operation to treat a child born with a previously inoperable heart malformation (tetralogy of Fallot). The procedure joined an artery leaving the heart to […]

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