Urine specific gravity

The specific gravity of urine (SG) is the specific gravity of urine, which refers to the ratio of the weight of urine to the volume of pure water at 4 degrees Celsius. Because urine contains 3-5% solid matter, the urine ratio is longer than pure water. The specific gravity of urine varies with the content of urine water, salt, and organic matter. In pathological conditions, it is also affected by protein, urine sugar, and cellular components. For example, if the anhydrous metabolism is dysfunctional, the determination of urine specific gravity can roughly reflect the concentrated dilution function of renal tubule . This test is suitable for people with kidney disease, dehydration or excess water, and when abnormal excretion is suspected.