The United States is the first country in the world to adopt the standard of surgical gowns and coverings. The United States Occupational Safety and Health Administration Commission (OSHA) issued regulations in 1991. According to the protection requirements specified by OSHA, the American Association for the Advancement of Medical Devices (AAMI) divides the protective performance of surgical gowns into four levels:

Level 1: For liquid exposure, injection and sputtering with the lowest risk, the operating garment is subjected to the least pressure as follows: operations or operations such as eye surgery, lumpectomy and skin biopsy.

Level 2: Small amount of liquid exposure, low injection and sputtering risk, low pressure on the operating garment such as hernia repair, tonsil surgery and angiography, etc.The operating gown of this grade must undergo two tests: the impermeable waterproof test and the hydrostatic pressure test.

Level 3: The operating garment is used for medium fluid exposure, injection and sputtering risk, and high pressure on the operating garment, such as shoulder arthroscopy, electroprostatectomy, mastectomy and other similar procedures and procedures.This grade of surgical clothing has higher requirements for water seepage and static voltage experiments.

Level 4: It is used for heavy fluid exposure, high injection and sputtering risk, and high pressure on the operating garment, such as hip replacement, caesarean section, cardiovascular surgery, and all surgical procedures and procedures where the surgeon's hand is inside the patient.This level requires a blood permeation test to be passed after surgery.

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