1. For autoimmune or immunodeficient patients: monitoring immune function status, investigating the cause, and guiding treatment.
2. For patients with recurrent or severe infections: Understand abnormal changes in the patient's immune function, identify the cause, and assist in clinical diagnosis and treatment.
3. For IgG4-related diseases: can serve as an auxiliary diagnostic indicator, as well as for dynamic monitoring of disease activity and evaluating prognosis after drug treatment.
4. Differential diagnosis of tumors, autoimmune diseases, and IgG4 RD.
5. For patients at risk of infection due to immunodeficiency (such as stem cell transplantation, cancer patients, etc.): Monitor immune function status, guide treatment, and assess prognosis.
