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1. 89% sensitive and 83% specific compared to amsel criteria.

2. Gram staining and nugent criteria has specific advantages over amselís clinical diagnosis including:1) a permanent record of the slide which can be reviewed to assess the diagnosis of BV and the reliability of the diagnosis, and 2) a grading or scoring system to be used to recognize intermediate stages of BV. Gram staining is also more commonly used in epidemiologic studies such as those preformed by the maternal-fetal medicine unit.