How often do lab coats need to be disinfected and washed?

According to Section 9 of the German BioStoffV ("General Protective Measures"), general hygiene measures must be observed for all activities involving biological agents. Among other things, the employer must ensure that changing facilities separate from the workplace are available. Work clothes must be changed and cleaned regularly and as needed. Information on wearing, using, and removing personal protective equipment, including protective clothing, must be included in the operating instructions (Section 14, Paragraph 1, No. 2c of the BioStoffV). But how often must protective clothing, such as lab coats, be cleaned and disinfected? TRBA 100 "Protective Measures for Activities with Biological Agents in Laboratories" requires that lab coats be worn in protection level 1 and above. Used lab coats must be stored separately from street clothes. Obviously contaminated protective coats (e.g., contaminated with bacterial suspension) should be disinfected and cleaned immediately. Coats should always be autoclaved before being washed in a standard household drum washing machine. Care should be taken to ensure that the lab coats are suitable for autoclaving. Another option is professional laundry disinfection in continuous or discontinuous professional drum washing machines (see also "List of disinfectants and procedures tested and approved by the Robert Koch Institute"). This option does not require the lab coats to be autoclaved beforehand, as the disinfection takes place in the machine itself. However, what happens if the lab coats have been worn for a longer period of time, but no contamination is known or visible? Do such lab coats generally have to be autoclaved before washing in washing machines? The BioStoffV and TRBA 100 do not state anything about this. However, the fact that TRBA 100 requires used lab coats to be stored separately from street clothes could imply that used lab coats should generally be considered potentially contaminated or infectious. In fact, contamination could also occur unknowingly (carryover) and remain undetected. Obviously contaminated lab coats should always be autoclaved before cleaning. In general, worn lab coats should be washed regularly (usually every 7-14 days) and instructions for doing so should be included in the operating instructions.