Under normal circumstances, drawing blood cannot detect kidney deficiency because kidney deficiency is a TCM diagnosis. Kidney deficiency is usually diagnosed by looking, smelling, questioning and cutting, and then observing the patient’s own symptoms, which are usually not reflected in the blood test. Kidney deficiency is usually accompanied by symptoms such as soreness and swelling of the lower back. Kidney deficiency can also be categorized into kidney yang deficiency and kidney yin deficiency. Kidney yang deficiency can be characterized by symptoms such as soreness and weakness of the lower back and knees, fear of cold and fear of cold, etc. Kidney yin deficiency can be characterized by symptoms such as hot flashes and night sweating and tinnitus. Whether to diagnose kidney deficiency or not needs to analyze the patient’s clinical manifestations through the four diagnostic methods, and blood sampling cannot detect kidney deficiency. If the patient has the above symptoms, it is recommended to consult a professional doctor in time and take appropriate treatment measures under the doctor’s guidance.