Is the LPN required to have a Medical Test Site (MTS) certification to perform Clinical Laboratory Improvement (CLIA)-waived or polymerase chain reaction (PCR) COVID-19 tests?

It depends. MTS Certification is required for the employer/facility to perform CLIA-waived tests regardless of setting. If the LPN owns the business/facility, then the business/facility must have the appropriate MTS certification.

Medical Test Sites (MTS) | Washington State Department of Health