Bethesda 2001.

The Bethesda system (TBS) for reporting cervical/vaginal cytological diagnoses was originally developed in 1988 at a National Cancer Institute (NCI) workshop convened to consider the benefits of increased standardization in the diagnostic reports provided by cytology laboratories. It rapidly gained acceptance in laboratory practice in the USA and beyond and three years later the NCI sponsored another workshop to assess the use of TBS in practice and consider areas for improvement. Subsequently an illustrated guide was published.