In MTT assay test of nanoparticles , How much minimum % cell viability a normal macrophages cell must show afetr treating with nanoparticles so that we can call it Biocompatible material.
I think the degree of biocompatibility % would be relative and depends on what kind of bioapplications, even if the more (>90%) the better.
Here is an example reference how to deal with it: http://www.nanoscience.gatech.edu/paper/2009/j_phys_chem_c_20114.pdf
I agree with the above answer. For instant, if you are dealing with a any antimicrobial coating material, its cytotoxicity from 80% to more than 90% is acceptable as Biocompatible.
Biocompatibility is a relative term contingent on the intended application. In addition to the excellent responses already given, I would suggest running a known biocompatible material alongside your test material as a reference - for example poly(lactic-co-glycolic acid) (PLGA).
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