A negative blood test indicates that the results are within normal limits. For example, blood matches, fecal occult blood, and routine urine tests are both positive and negative to determine the results. If it is negative, it indicates normal, and if it is positive, the number of plus signs indicates the extent of the result. Biochemical tests such as liver function, kidney function, and blood cell analysis are all based on numerical values to determine if the results are normal. If they are higher or lower than their normal values, they are mostly abnormal, so a negative blood test indicates complete normalcy. In the case of fecal occult blood tests and routine urine tests, the results are determined by positive and negative results. If the result is negative, it is normal, and if it is positive, it is abnormal, and the degree of the result is indicated by the number of plus signs. Therefore, a negative blood test means that the indicators are completely normal and there is no need to worry. If the test results are abnormal, it is recommended to consult a doctor promptly.