CLIA Complexity: Non-Waived CPT Codes: 86430/86318 Latex agglutination test for the qualitative and semi-quantitative determination of rheumatoid factor in serum Can be used to both screen for levels of RF in serum greater than 10 IU/mL and determine titers of RF in serum in IU/mL using the semi-quantitative technique For in vitro diagnostic use