In recent years, some places have adopted the practice of a hospital’s laboratory test sheets are common in the region’s hospitals, which has attracted the attention of the general public. The question of whether labs can be universal is a complex one and cannot be rigidly defined. It is necessary to first understand the process of the doctor to diagnose the disease. When a doctor diagnoses a disease, the most important thing is to first understand the patient’s main problem, which is what we call signs and symptoms, i.e., whether it is headache or abdominal pain, fever or malaise, vomiting or diarrhea. The patient’s body is then carefully examined in the hope of detecting some abnormal signs and analyzing the possibility of the patient’s presence of disease through medical knowledge and clinical experience. Subsequently, some laboratory tests (such as laboratory tests, ultrasound, CT, etc.) are needed to further confirm the possible presence of the disease. When the results of the laboratory tests conform to the doctor’s clinical judgment, the doctor will make an appropriate diagnosis; if the test results do not conform to the doctor’s judgment, the doctor will further find out the reasons or make corrections to the diagnosis to continuously improve the accuracy of the diagnosis. Some patients have more obvious and specific symptoms and signs, and some simple tests can make a correct diagnosis. For example, if the patient has obvious excessive drinking, polyuria and wasting, and the blood glucose is high after several times of examination in other hospitals, the diagnosis of diabetes is established and there is no need to repeat the examination; if the blood glucose is normal after several times of examination in other hospitals, it is necessary to examine again to be sure. In addition, there is rarely a 100% accurate laboratory test or diagnosis in clinical practice. Due to the different sensitivity of experimental examination instruments, different methods, and different normal values, the examination in one place does not apply in another area. For example, the amount of iodine ingested by the population varies from place to place, and the thyroid uptake rate varies from place to place, with different normal values. In addition, because doctors have different experience, the analysis of the laboratory results will be different, so sometimes doctors need to repeat the laboratory tests from another hospital. Sometimes even if the diagnosis is clear, it needs to be confirmed and corrected continuously during treatment or follow-up, which requires further laboratory tests to observe the condition and treatment results in a timely manner. In such cases, whether laboratory tests from other hospitals help in diagnosis and treatment is a matter of patient-specific analysis.