Used in biomedical research to quantify secretory immunoglobulin A (SIgA) levels in biological samples such as saliva, milk, and mucosal secretions. Enables assessment of mucosal immune responses in studies related to infectious diseases, vaccine efficacy, gut health, and autoimmune conditions. Widely applied in clinical labs, pharmaceutical research, and immunology studies to monitor immune status and evaluate the impact of interventions like probiotics or nutritional supplements. Provides a reliable, high-throughput method for detecting SIgA with high sensitivity and specificity.