An ASO (Antistreptolysin-O) Latex Agglutination Test Kit is a diagnostic tool used for the qualitative and semi-quantitative detection of ASO antibodies in human serum, indicating a recent or ongoing streptococcal infection or a complication like rheumatic fever or acute glomerulonephritis. The test involves mixing latex particles coated with streptolysin-O antigen with a patient's serum; visible agglutination (clumping) occurs if the ASO antibodies are present in sufficient amounts, demonstrating a positive result.