“Specific gravity” in the clinic generally refers to the specific gravity of urine, the normal value range is generally between 1.010 ~ 1.025, the reference value range of different measurement methods is slightly different, the specific gravity of urine 1.030 is mildly elevated, may be due to drinking less water, but also can be seen in diabetes mellitus, nephritis and other diseases. Urine specific gravity refers to the ratio of the weight of urine to the weight of the same volume of pure water at 4℃, which can reflect the content of solutes in the urine, and the size of its value depends on the blood volume, the concentration function of the kidneys and other factors. Urine specific gravity of 1.030 is a mild increase, may be due to low water consumption before the test, resulting in the concentration of urine, you can drink water and review. It can also be seen in acute glomerulonephritis, diabetes mellitus, nephrotic syndrome and other diseases. The result of urine specific gravity test is affected by many factors, simply abnormal urine specific gravity can not diagnose the disease, need to go to the hospital for further examination.