Many patients often ask why they have to be examined before each chemotherapy treatment, are they repeating unnecessary tests? Chemotherapy is a special treatment, liver function, kidney function, cardiac function, hematopoietic function, etc. must reach the corresponding standards before chemotherapy, so these indicators must be checked before each chemotherapy, and the dosage of chemotherapy drugs can be adjusted for certain minor abnormalities, but when the relevant functions are obviously abnormal, chemotherapy cannot be administered temporarily, and some drugs even need to be discontinued. For example, chemotherapy drugs such as adriamycin, epiamycin and Herceptin, which are commonly used in clinical practice, have more obvious cardiotoxicity. Before using such drugs, patients must be evaluated for comprehensive basic cardiac function, including medical history, physical examination such as electrocardiogram and cardiac ultrasound, biochemical examination such as myocardial enzyme profile, etc. If patients show clinically significant left ventricular hypofunction, discontinuation of such drugs should be considered. If chemotherapy is still given despite significant abnormalities in the relevant functions, it may have serious consequences and even be life-threatening. These basic functional items require examination prior to each chemotherapy treatment. Another important purpose of pre-chemotherapy examination is to understand the tumor condition and evaluate the efficacy of treatment, usually through imaging examinations such as CT or MRI to understand the tumor size and metastasis, and to evaluate the efficacy of treatment by comparing the “films” before and after treatment, so as to determine whether the current chemotherapy regimen is effective. If it is effective, the current chemotherapy regimen will continue to be used. If the current chemotherapy regimen is found to be ineffective or previously effective but now resistant, the chemotherapy regimen must be changed immediately. Imaging examinations are generally staged, and the efficacy of chemotherapy is usually evaluated once every 3 cycles, depending on the actual situation. In addition, depending on the condition, some of them also require gastroscopy, colonoscopy, puncture biopsy and other examination items. Therefore, the examination before chemotherapy is extremely important. It is extremely irresponsible to blindly administer chemotherapy without the necessary assessment of the patient’s condition and physical function through the examination. If a patient is already resistant to the current chemotherapy regimen but still follows the original regimen with eyes closed, the patient suffers and delays the disease. Similarly, if a patient develops impairment of liver function, kidney function or cardiac function, some relevant and necessary measures must be taken.