High urine specific gravity should be tested for routine urine tests to observe the causes of urine specific gravity increase, such as the presence of bleeding, red blood cells in the urine, infection, a large number of white blood cells in the urine, or metabolites in the urine containing nitrates and organic salts, which can also lead to an increase in urine specific gravity. If the urine test is routine and all other test results are normal, but the specific gravity of urine is elevated, this condition is caused by not drinking enough water and concentrated urine. If there are nitrates and nitrites in the urine, it may be related to the consumption of large amounts of meat substances, which will be metabolized in the body after consumption and produce large amounts of nitrates and nitrites, which will also lead to an increase in the specific gravity of urine. The presence of hematuria and urinary tract infection will also increase the specific gravity of urine.