The difference between urine protein and protein: First, they are tested differently. Urine protein is an indicator in routine urine tests, so it is often necessary to retain urine for laboratory tests. Protein is an indicator in liver function tests and often requires a blood sample on an empty stomach. Secondly, the normal range of urine protein and protein is different. Under normal circumstances, urine protein is negative, while under normal circumstances, the normal range of albumin is about 35-65g/L. Thirdly, urine protein and protein are produced for different reasons. Urine protein is often produced due to damage to the glomerular filtration membrane of the kidney or dysfunction of renal tubular reabsorption, producing a urine protein condition. If there is a drop in protein, it is often due to liver damage, reduced protein synthesis in the liver or excessive protein leakage from the kidneys.