RT-PCR test for travel (test at home)

I need a RT PCR test report that is valid for international travel.

Is there someplace offering these tests at home? Not the rapid test or antigen test but the specific PCR test that’s required for entry to most countries.

Also, is the saliva-based RT PCR test report accepted as valid for travel? Do the test reports mention the method of taking the sample—want to be sure so as not to have any problems at the airport. And is there any clinic offering this (saliva based) test at home?

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