
Latex agglutination tests for Rheumatoid Factor (RA), C-Reactive Protein (CRP), and Anti-Streptolysin O (ASO) are used to diagnose and monitor various conditions, primarily autoimmune and infectious diseases. These tests involve mixing a patient's serum with latex particles coated with specific antibodies, and observing for agglutination (clumping), which indicates a positive result.