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[Figure, Pap test. A speculum is] - PDQ Cancer Information Summaries - NCBI Bookshelf
Bend your knees and place your feet wide apart. Different styles of speculums work slightly differently, but all have two bills and a handle. Use the lever to open the bills until the lock clicks. Be sure to figure out how to release the lock before you insert it.
A speculum Latin for "mirror"; plural specula or speculums is a medical tool for investigating body orifices , with a form dependent on the orifice for which it is designed. In old texts, the speculum may also be referred to as a diopter or dioptra. Vaginal and anal specula were used by the ancient Greeks and Romans ,  and speculum artifacts have been found in Pompeii.
A vaginal speculum is a tool that doctors use during pelvic exams. Your doctor inserts the speculum into your vagina and gently opens it during your exam. Speculums come in different sizes. Your doctor will choose the size to use based on your age and the length and width of your vagina.