Why is it important for doctors to know the concentration of disease antigen present in a patients system?

Knowing the concentration of disease antigen in a patient's system is crucial for accurate diagnosis and treatment planning. It helps doctors assess the severity of the disease, monitor its progression, and evaluate the effectiveness of ongoing therapies. Additionally, understanding antigen levels can aid in distinguishing between different conditions with similar symptoms, ensuring targeted and appropriate interventions. Overall, this information contributes to personalized patient care and improved health outcomes.