The presence of low CD19 in the test report indicates that a woman’s immune system is low, which is an immune factor found in the body’s lymphatic system. Women who are prone to have low CD19 during pregnancy preparation should pay attention to it and improve their diet and lifestyle habits. It is important to improve the diet and lifestyle habits, such as a balanced diet, a reasonable diet, rest, avoiding late nights, and proper physical exercise to strengthen the immune system. When the CD19 value is normal, it will help to maintain the normal menstrual cycle of women and prepare for pregnancy. It is also important to note that if women use immunosuppressants for a long time, they are also prone to low values.