For healthcare activities with low, medium, or high risk of contamination, surgical gowns (ANSI/AAMI PB70 Levels 1-4), can be used.If there is a medium to high risk of contamination and need for a large critical zone, isolation gowns that claim moderate to high barrier protection (ANSI/AAMI PB70 Level 3 or 4) can be used.Certain areas of surgical and isolation gowns are defined as “critical zones” where direct contact with blood, body fluids, and/or other potentially infectious materials is most likely to occur. The choice of gown should be made based on the level of risk of contamination. While the transmissibility of COVID-19 is not fully understood, gowns are available that protect against microorganisms.For gowns, it is important to have sufficient overlap of the fabric so that it wraps around the body to cover the back (ensuring that if the wearer squats or sits down, the gown still protects the back area of the body).(Technical Information Report (TIR) 11 ). Some of the factors important to assessing the risk of exposure in health facilities include source, modes of transmission, pressures and types of contact, and duration and type of tasks to be performed by the user of the PPE. As with any type of PPE, the key to proper selection and use of protective clothing is to understand the hazards and the risk of exposure. The American National Standards Institute (ANSI) and the Association of the Advancement of Medical Instrumentation (AAMI): ANSI/AAMI PB70:2012 describes the liquid barrier performance and a classification of surgical and isolation gowns for use in health care facilities. Many organizations have published guidelines for the use of personal protective equipment (PPE) in medical settings.
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