Negative reference value of urine routine occult blood, that is, urine routine in the normal situation should be negative, the reference value is the normal value. The patient’s actual measured value, to be compared with the reference value, the reference value is negative is normal, if the measured actual value is also negative, it suggests that it is normal. If the actual value is positive, it is an abnormal result, then there may be bleeding in the urinary tract, and further examination is needed to clarify the cause of the bleeding. That is, the urine routine examination report, will list two columns of results, the first column of results is the patient’s actual measured value, the second column of results is the normal value. The first column is the actual measurement taken by the patient and the second column is the normal value. If the patient’s actual measurement is higher than the normal value, it is a disease condition. If it is within the normal range of values, it is a normal condition and does not require any treatment. The reference value can be a qualitative result or a quantitative result. A qualitative result is also known as a negative or positive result, and a quantitative result is a specific value, such as no higher than 10, or no higher than 10 mL.