In case you ever want to try it out this is the place I use.Really? I would consider doing a test through them if the shipping isn’t too expensive.
https://www.vetdna.com/
In terms of shipping, the PCR tests for DNA viruses can be old (not sure how old but no need for very expensive shipping). Many common ailments are DNA based so that works well.
Some are RNA based and those have to be less than 24 hours old - that gets very expensive and I have never tried it.
You have to purchase the right supplies - swabs or vials - they will advise what you need. I fine throat swabs are easiest, but probably blood is more reliable.