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We also use 1.7 ng/dL as our upper limit of normal as per the package insert.  However, we´ve not run into those types of complaints.

As you know, generally in viral infections IgM develops first. The pentomer structure gives it much more anti-antigen power than IgG. Quanitiative studies have shown that IgM develops first in SARS-CoV-2 infection although some qualitative studies have ...

Also in this text -Chapter- https://doi.org/10.1039/9781849734929-00186 , I explain how to concentrate a biological fluid impregnated on paper, starting from a paper that already contains it impregnated.

With respect to your options we do #3... reluctantly.  ​We always provide the qualitative result; if someone specifically requests a number too, then we'll add it as a comment along with the interpretive information.  I used to try to talk with whomever ...