A CTC tumor cell test result of 13 indicates a high value. CTC test is also known as Circulating Tumor Cells and a CTC test result of 13 is an indication of a high value. Clinically, when the number of CTC test is greater than or equal to 5, it can indicate that the disease is progressing faster or the prognosis of the tumor is poor. When the CTC test number is between 2 and 5, it suggests that there is a risk of tumor cells in the patient’s body and that the disease may progress. If the patient’s CTC detection number is less than 2, it suggests that no CTC is detected in the sample sent for testing, or the patient’s CTC level is normal, which suggests that the patient’s condition is stable and in a state of improvement. Clinically, the accuracy and feasibility of CTC detection is better than imaging diagnosis, which can be used for early diagnosis of whether the lesions of tumor patients have metastasis, and can be intervened in advance.