LOINC 2.83 Components Containing "plexA" Clarification

Does “plexA” represent multiplex testing? If not, could you describe what it does represent?
Please see the examples below for reference.

114501-0 Gastrointestinal pathogens 11-plexA DNA and RNA panel - Stool
114488-0 Gastrointestinal pathogens 22-plexA DNA and RNA panel - Stool by NAA with non-probe detection
114498-9 Pharyngeal pathogens 14-plexA DNA and RNA panel - Throat
114489-8 Pharyngeal pathogens 15-plexA DNA and RNA panel - Throat by NAA with non-probe detection
114482-3 Pharyngeal pathogens 5-plexA DNA and RNA panel - Throat
114483-1 Pharyngeal pathogens 6-plexA DNA and RNA panel - Throat
114493-0 Respiratory pathogens 15-plexA DNA and RNA panel - Nasopharynx
114499-7 Respiratory pathogens 23-plexA DNA and RNA panel - Nasopharynx
114500-2 Respiratory pathogens 24-plexA DNA and RNA panel - Nasopharynx
114487-2 Respiratory pathogens 33-plexA DNA and RNA panel - Lower respiratory specimen
114484-9 Respiratory pathogens 34-plexA DNA and RNA panel - Lower respiratory specimen
112279-5 Respiratory pathogens 5-plexA DNA and RNA panel - Nasopharynx by NAA with non-probe detection
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